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decimal/decimal_test.go
yzy613 840ef45ca8 feat: RoundHalfUp() and RoundHalfDown()
2024-07-18 20:08:15 +08:00

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package decimal
import (
"database/sql/driver"
"encoding/json"
"encoding/xml"
"fmt"
"math"
"math/big"
"math/rand"
"reflect"
"regexp"
"strconv"
"strings"
"testing"
"testing/quick"
"time"
)
type testEnt struct {
float float64
short string
exact string
inexact string
}
var testTable = []*testEnt{
{3.141592653589793, "3.141592653589793", "", "3.14159265358979300000000000000000000000000000000000004"},
{3, "3", "", "3.0000000000000000000000002"},
{1234567890123456, "1234567890123456", "", "1234567890123456.00000000000000002"},
{1234567890123456000, "1234567890123456000", "", "1234567890123456000.0000000000000008"},
{1234.567890123456, "1234.567890123456", "", "1234.5678901234560000000000000009"},
{.1234567890123456, "0.1234567890123456", "", "0.12345678901234560000000000006"},
{0, "0", "", "0.000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001"},
{.1111111111111110, "0.111111111111111", "", "0.111111111111111000000000000000009"},
{.1111111111111111, "0.1111111111111111", "", "0.111111111111111100000000000000000000023423545644534234"},
{.1111111111111119, "0.1111111111111119", "", "0.111111111111111900000000000000000000000000000000000134123984192834"},
{.000000000000000001, "0.000000000000000001", "", "0.00000000000000000100000000000000000000000000000000012341234"},
{.000000000000000002, "0.000000000000000002", "", "0.0000000000000000020000000000000000000012341234123"},
{.000000000000000003, "0.000000000000000003", "", "0.00000000000000000299999999999999999999999900000000000123412341234"},
{.000000000000000005, "0.000000000000000005", "", "0.00000000000000000500000000000000000023412341234"},
{.000000000000000008, "0.000000000000000008", "", "0.0000000000000000080000000000000000001241234432"},
{.1000000000000001, "0.1000000000000001", "", "0.10000000000000010000000000000012341234"},
{.1000000000000002, "0.1000000000000002", "", "0.10000000000000020000000000001234123412"},
{.1000000000000003, "0.1000000000000003", "", "0.1000000000000003000000000000001234123412"},
{.1000000000000005, "0.1000000000000005", "", "0.1000000000000005000000000000000006441234"},
{.1000000000000008, "0.1000000000000008", "", "0.100000000000000800000000000000000009999999999999999999999999999"},
{1e25, "10000000000000000000000000", "", ""},
{1.5e14, "150000000000000", "", ""},
{1.5e15, "1500000000000000", "", ""},
{1.5e16, "15000000000000000", "", ""},
{1.0001e25, "10001000000000000000000000", "", ""},
{1.0001000000000000033e25, "10001000000000000000000000", "", ""},
{2e25, "20000000000000000000000000", "", ""},
{4e25, "40000000000000000000000000", "", ""},
{8e25, "80000000000000000000000000", "", ""},
{1e250, "10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000", "", ""},
{2e250, "20000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000", "", ""},
{math.MaxInt64, strconv.FormatFloat(float64(math.MaxInt64), 'f', -1, 64), "", strconv.FormatInt(math.MaxInt64, 10)},
{1.29067116156722e-309, "0.00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000129067116156722", "", "0.000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001290671161567218558822290567835270536800098852722416870074139002112543896676308448335063375297788379444685193974290737962187240854947838776604607190387984577130572928111657710645015086812756013489109884753559084166516937690932698276436869274093950997935137476803610007959500457935217950764794724766740819156974617155861568214427828145972181876775307023388139991104942469299524961281641158436752347582767153796914843896176260096039358494077706152272661453132497761307744086665088096215425146090058519888494342944692629602847826300550628670375451325582843627504604013541465361435761965354140678551369499812124085312128659002910905639984075064968459581691226705666561364681985266583563078466180095375402399087817404368974165082030458595596655868575908243656158447265625000000000000000000000000000000000000004440000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"},
// go Issue 29491.
{498484681984085570, "498484681984085570", "", ""},
{5.8339553793802237e+23, "583395537938022370000000", "", ""},
}
var testTableScientificNotation = map[string]string{
"1e9": "1000000000",
"2.41E-3": "0.00241",
"24.2E-4": "0.00242",
"243E-5": "0.00243",
"1e-5": "0.00001",
"245E3": "245000",
"1.2345E-1": "0.12345",
"0e5": "0",
"0e-5": "0",
"0.e0": "0",
".0e0": "0",
"123.456e0": "123.456",
"123.456e2": "12345.6",
"123.456e10": "1234560000000",
}
func init() {
for _, s := range testTable {
s.exact = strconv.FormatFloat(s.float, 'f', 1500, 64)
if strings.ContainsRune(s.exact, '.') {
s.exact = strings.TrimRight(s.exact, "0")
s.exact = strings.TrimRight(s.exact, ".")
}
}
// add negatives
withNeg := testTable[:]
for _, s := range testTable {
if s.float > 0 && s.short != "0" && s.exact != "0" {
withNeg = append(withNeg, &testEnt{-s.float, "-" + s.short, "-" + s.exact, "-" + s.inexact})
}
}
testTable = withNeg
for e, s := range testTableScientificNotation {
if string(e[0]) != "-" && s != "0" {
testTableScientificNotation["-"+e] = "-" + s
}
}
}
func TestNewFromFloat(t *testing.T) {
for _, x := range testTable {
s := x.short
d := NewFromFloat(x.float)
if d.String() != s {
t.Errorf("expected %s, got %s (float: %v) (%s, %d)",
s, d.String(), x.float,
d.value.String(), d.exp)
}
}
shouldPanicOn := []float64{
math.NaN(),
math.Inf(1),
math.Inf(-1),
}
for _, n := range shouldPanicOn {
var d Decimal
if !didPanic(func() { d = NewFromFloat(n) }) {
t.Fatalf("Expected panic when creating a Decimal from %v, got %v instead", n, d.String())
}
}
}
func TestNewFromFloatRandom(t *testing.T) {
n := 0
rng := rand.New(rand.NewSource(0xdead1337))
for {
n++
if n == 10 {
break
}
in := (rng.Float64() - 0.5) * math.MaxFloat64 * 2
want, err := NewFromString(strconv.FormatFloat(in, 'f', -1, 64))
if err != nil {
t.Error(err)
continue
}
got := NewFromFloat(in)
if !want.Equal(got) {
t.Errorf("in: %v, expected %s (%s, %d), got %s (%s, %d) ",
in, want.String(), want.value.String(), want.exp,
got.String(), got.value.String(), got.exp)
}
}
}
func TestNewFromFloatQuick(t *testing.T) {
err := quick.Check(func(f float64) bool {
want, werr := NewFromString(strconv.FormatFloat(f, 'f', -1, 64))
if werr != nil {
return true
}
got := NewFromFloat(f)
return got.Equal(want)
}, &quick.Config{})
if err != nil {
t.Error(err)
}
}
func TestNewFromFloat32Random(t *testing.T) {
n := 0
rng := rand.New(rand.NewSource(0xdead1337))
for {
n++
if n == 10 {
break
}
in := float32((rng.Float64() - 0.5) * math.MaxFloat32 * 2)
want, err := NewFromString(strconv.FormatFloat(float64(in), 'f', -1, 32))
if err != nil {
t.Error(err)
continue
}
got := NewFromFloat32(in)
if !want.Equal(got) {
t.Errorf("in: %v, expected %s (%s, %d), got %s (%s, %d) ",
in, want.String(), want.value.String(), want.exp,
got.String(), got.value.String(), got.exp)
}
}
}
func TestNewFromFloat32Quick(t *testing.T) {
err := quick.Check(func(f float32) bool {
want, werr := NewFromString(strconv.FormatFloat(float64(f), 'f', -1, 32))
if werr != nil {
return true
}
got := NewFromFloat32(f)
return got.Equal(want)
}, &quick.Config{})
if err != nil {
t.Error(err)
}
}
func TestNewFromString(t *testing.T) {
for _, x := range testTable {
s := x.short
d, err := NewFromString(s)
if err != nil {
t.Errorf("error while parsing %s", s)
} else if d.String() != s {
t.Errorf("expected %s, got %s (%s, %d)",
s, d.String(),
d.value.String(), d.exp)
}
}
for _, x := range testTable {
s := x.exact
d, err := NewFromString(s)
if err != nil {
t.Errorf("error while parsing %s", s)
} else if d.String() != s {
t.Errorf("expected %s, got %s (%s, %d)",
s, d.String(),
d.value.String(), d.exp)
}
}
for e, s := range testTableScientificNotation {
d, err := NewFromString(e)
if err != nil {
t.Errorf("error while parsing %s", e)
} else if d.String() != s {
t.Errorf("expected %s, got %s (%s, %d)",
s, d.String(),
d.value.String(), d.exp)
}
}
}
func TestNewFromFormattedString(t *testing.T) {
for _, testCase := range []struct {
Formatted string
Expected string
ReplRegex *regexp.Regexp
}{
{"$10.99", "10.99", regexp.MustCompile("[$]")},
{"$ 12.1", "12.1", regexp.MustCompile("[$\\s]")},
{"$61,690.99", "61690.99", regexp.MustCompile("[$,]")},
{"1_000_000.00", "1000000.00", regexp.MustCompile("[_]")},
{"41,410.00", "41410.00", regexp.MustCompile("[,]")},
{"5200 USD", "5200", regexp.MustCompile("[USD\\s]")},
} {
dFormatted, err := NewFromFormattedString(testCase.Formatted, testCase.ReplRegex)
if err != nil {
t.Fatal(err)
}
dExact, err := NewFromString(testCase.Expected)
if err != nil {
t.Fatal(err)
}
if !dFormatted.Equal(dExact) {
t.Errorf("expect %s, got %s", dExact, dFormatted)
}
}
}
func TestFloat64(t *testing.T) {
for _, x := range testTable {
if x.inexact == "" || x.inexact == "-" {
continue
}
s := x.exact
d, err := NewFromString(s)
if err != nil {
t.Errorf("error while parsing %s", s)
} else if f, exact := d.Float64(); !exact || f != x.float {
t.Errorf("cannot represent exactly %s", s)
}
s = x.inexact
d, err = NewFromString(s)
if err != nil {
t.Errorf("error while parsing %s", s)
} else if f, exact := d.Float64(); exact || f != x.float {
t.Errorf("%s should be represented inexactly", s)
}
}
}
func TestNewFromStringErrs(t *testing.T) {
tests := []string{
"",
"qwert",
"-",
".",
"-.",
".-",
"234-.56",
"234-56",
"2-",
"..",
"2..",
"..2",
".5.2",
"8..2",
"8.1.",
"1e",
"1-e",
"1e9e",
"1ee9",
"1ee",
"1eE",
"1e-",
"1e-.",
"1e1.2",
"123.456e1.3",
"1e-1.2",
"123.456e-1.3",
"123.456Easdf",
"123.456e" + strconv.FormatInt(math.MinInt64, 10),
"123.456e" + strconv.FormatInt(math.MinInt32, 10),
"512.99 USD",
"$99.99",
"51,850.00",
"20_000_000.00",
"$20_000_000.00",
}
for _, s := range tests {
_, err := NewFromString(s)
if err == nil {
t.Errorf("error expected when parsing %s", s)
}
}
}
func TestNewFromStringDeepEquals(t *testing.T) {
type StrCmp struct {
str1 string
str2 string
expected bool
}
tests := []StrCmp{
{"1", "1", true},
{"1.0", "1.0", true},
{"10", "10.0", false},
{"1.1", "1.10", false},
{"1.001", "1.01", false},
}
for _, cmp := range tests {
d1, err1 := NewFromString(cmp.str1)
d2, err2 := NewFromString(cmp.str2)
if err1 != nil || err2 != nil {
t.Errorf("error parsing strings to decimals")
}
if reflect.DeepEqual(d1, d2) != cmp.expected {
t.Errorf("comparison result is different from expected results for %s and %s",
cmp.str1, cmp.str2)
}
}
}
func TestRequireFromString(t *testing.T) {
s := "1.23"
defer func() {
err := recover()
if err != nil {
t.Errorf("error while parsing %s", s)
}
}()
d := RequireFromString(s)
if d.String() != s {
t.Errorf("expected %s, got %s (%s, %d)",
s, d.String(),
d.value.String(), d.exp)
}
}
func TestRequireFromStringErrs(t *testing.T) {
s := "qwert"
var d Decimal
var err interface{}
func(d Decimal) {
defer func() {
err = recover()
}()
RequireFromString(s)
}(d)
if err == nil {
t.Errorf("panic expected when parsing %s", s)
}
}
func TestNewFromFloatWithExponent(t *testing.T) {
type Inp struct {
float float64
exp int32
}
// some tests are taken from here https://www.cockroachlabs.com/blog/rounding-implementations-in-go/
tests := map[Inp]string{
Inp{123.4, -3}: "123.4",
Inp{123.4, -1}: "123.4",
Inp{123.412345, 1}: "120",
Inp{123.412345, 0}: "123",
Inp{123.412345, -5}: "123.41235",
Inp{123.412345, -6}: "123.412345",
Inp{123.412345, -7}: "123.412345",
Inp{123.412345, -28}: "123.4123450000000019599610823207",
Inp{1230000000, 3}: "1230000000",
Inp{123.9999999999999999, -7}: "124",
Inp{123.8989898999999999, -7}: "123.8989899",
Inp{0.49999999999999994, 0}: "0",
Inp{0.5, 0}: "1",
Inp{0., -1000}: "0",
Inp{0.5000000000000001, 0}: "1",
Inp{1.390671161567e-309, 0}: "0",
Inp{4.503599627370497e+15, 0}: "4503599627370497",
Inp{4.503599627370497e+60, 0}: "4503599627370497110902645731364739935039854989106233267453952",
Inp{4.503599627370497e+60, 1}: "4503599627370497110902645731364739935039854989106233267453950",
Inp{4.503599627370497e+60, -1}: "4503599627370497110902645731364739935039854989106233267453952",
Inp{50, 2}: "100",
Inp{49, 2}: "0",
Inp{50, 3}: "0",
// subnormals
Inp{1.390671161567e-309, -2000}: "0.000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001390671161567000864431395448332752540137009987788957394095829635554502771758698872408926974382819387852542087331897381878220271350970912568035007740861074263206736245957501456549756342151614772544950978154339064833880234531754156635411349342950306987480369774780312897442981323940546749863054846093718407237782253156822124910364044261653195961209878120072488178603782495270845071470243842997312255994555557251870400944414666445871039673491570643357351279578519863428540219295076767898526278029257129758694673164251056158277568765100904638511604478844087596428177947970563689475826736810456067108202083804368114484417399279328807983736233036662284338182105684628835292230438999173947056675615385756827890872955322265625",
Inp{1.390671161567e-309, -862}: "0.0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000013906711615670008644313954483327525401370099877889573940958296355545027717586988724089269743828193878525420873318973818782202713509709125680350077408610742632067362459575014565497563421516147725449509781543390648338802345317541566354113493429503069874803697747803128974429813239405467498630548460937184072377822531568221249103640442616531959612098781200724881786037824952708450714702438429973122559945555572518704009444146664458710396734915706433573512795785198634285402192950767678985262780292571297586946731642510561582775687651009046385116044788440876",
Inp{1.390671161567e-309, -863}: "0.0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000013906711615670008644313954483327525401370099877889573940958296355545027717586988724089269743828193878525420873318973818782202713509709125680350077408610742632067362459575014565497563421516147725449509781543390648338802345317541566354113493429503069874803697747803128974429813239405467498630548460937184072377822531568221249103640442616531959612098781200724881786037824952708450714702438429973122559945555572518704009444146664458710396734915706433573512795785198634285402192950767678985262780292571297586946731642510561582775687651009046385116044788440876",
}
// add negatives
for p, s := range tests {
if p.float > 0 {
if s != "0" {
tests[Inp{-p.float, p.exp}] = "-" + s
} else {
tests[Inp{-p.float, p.exp}] = "0"
}
}
}
for input, s := range tests {
d := NewFromFloatWithExponent(input.float, input.exp)
if d.String() != s {
t.Errorf("expected %s, got %s (%s, %d)",
s, d.String(),
d.value.String(), d.exp)
}
}
shouldPanicOn := []float64{
math.NaN(),
math.Inf(1),
math.Inf(-1),
}
for _, n := range shouldPanicOn {
var d Decimal
if !didPanic(func() { d = NewFromFloatWithExponent(n, 0) }) {
t.Fatalf("Expected panic when creating a Decimal from %v, got %v instead", n, d.String())
}
}
}
func TestNewFromInt(t *testing.T) {
tests := map[int64]string{
0: "0",
1: "1",
323412345: "323412345",
9223372036854775807: "9223372036854775807",
-9223372036854775808: "-9223372036854775808",
}
// add negatives
for p, s := range tests {
if p > 0 {
tests[-p] = "-" + s
}
}
for input, s := range tests {
d := NewFromInt(input)
if d.String() != s {
t.Errorf("expected %s, got %s (%s, %d)",
s, d.String(),
d.value.String(), d.exp)
}
}
}
func TestNewFromInt32(t *testing.T) {
tests := map[int32]string{
0: "0",
1: "1",
323412345: "323412345",
2147483647: "2147483647",
-2147483648: "-2147483648",
}
// add negatives
for p, s := range tests {
if p > 0 {
tests[-p] = "-" + s
}
}
for input, s := range tests {
d := NewFromInt32(input)
if d.String() != s {
t.Errorf("expected %s, got %s (%s, %d)",
s, d.String(),
d.value.String(), d.exp)
}
}
}
func TestNewFromUint64(t *testing.T) {
tests := map[uint64]string{
0: "0",
1: "1",
323412345: "323412345",
9223372036854775807: "9223372036854775807",
18446744073709551615: "18446744073709551615",
}
for input, s := range tests {
d := NewFromUint64(input)
if d.String() != s {
t.Errorf("expected %s, got %s (%s, %d)",
s, d.String(),
d.value.String(), d.exp)
}
}
}
func TestNewFromBigIntWithExponent(t *testing.T) {
type Inp struct {
val *big.Int
exp int32
}
tests := map[Inp]string{
Inp{big.NewInt(123412345), -3}: "123412.345",
Inp{big.NewInt(2234), -1}: "223.4",
Inp{big.NewInt(323412345), 1}: "3234123450",
Inp{big.NewInt(423412345), 0}: "423412345",
Inp{big.NewInt(52341235), -5}: "523.41235",
Inp{big.NewInt(623412345), -6}: "623.412345",
Inp{big.NewInt(723412345), -7}: "72.3412345",
}
// add negatives
for p, s := range tests {
if p.val.Cmp(Zero.value) > 0 {
tests[Inp{p.val.Neg(p.val), p.exp}] = "-" + s
}
}
for input, s := range tests {
d := NewFromBigInt(input.val, input.exp)
if d.String() != s {
t.Errorf("expected %s, got %s (%s, %d)",
s, d.String(),
d.value.String(), d.exp)
}
}
}
func TestNewFromBigRat(t *testing.T) {
mustParseRat := func(val string) *big.Rat {
num, _ := new(big.Rat).SetString(val)
return num
}
type Inp struct {
val *big.Rat
prec int32
}
tests := map[Inp]string{
Inp{big.NewRat(0, 1), 16}: "0",
Inp{big.NewRat(4, 5), 16}: "0.8",
Inp{big.NewRat(10, 2), 16}: "5",
Inp{big.NewRat(1023427554493, 43432632), 16}: "23563.5628642767953828", // rounded
Inp{big.NewRat(1, 434324545566634), 16}: "0.0000000000000023",
Inp{big.NewRat(1, 3), 16}: "0.3333333333333333",
Inp{big.NewRat(2, 3), 2}: "0.67", // rounded
Inp{big.NewRat(2, 3), 16}: "0.6666666666666667", // rounded
Inp{big.NewRat(10000, 3), 16}: "3333.3333333333333333",
Inp{mustParseRat("30702832066636633479"), 16}: "30702832066636633479",
Inp{mustParseRat("487028320159896636679.1827512895753"), 16}: "487028320159896636679.1827512895753",
Inp{mustParseRat("127028320612589896636633479.173582751289575278357832"), -2}: "127028320612589896636633500", // rounded
Inp{mustParseRat("127028320612589896636633479.173582751289575278357832"), 16}: "127028320612589896636633479.1735827512895753", // rounded
Inp{mustParseRat("127028320612589896636633479.173582751289575278357832"), 32}: "127028320612589896636633479.173582751289575278357832",
}
// add negatives
for p, s := range tests {
if p.val.Cmp(new(big.Rat)) > 0 {
tests[Inp{p.val.Neg(p.val), p.prec}] = "-" + s
}
}
for input, s := range tests {
d := NewFromBigRat(input.val, input.prec)
if d.String() != s {
t.Errorf("expected %s, got %s (%s, %d)",
s, d.String(),
d.value.String(), d.exp)
}
}
}
func TestCopy(t *testing.T) {
origin := New(1, 0)
cpy := origin.Copy()
if origin.value == cpy.value {
t.Error("expecting copy and origin to have different value pointers")
}
if cpy.Cmp(origin) != 0 {
t.Error("expecting copy and origin to be equals, but they are not")
}
//change value
cpy = cpy.Add(New(1, 0))
if cpy.Cmp(origin) == 0 {
t.Error("expecting copy and origin to have different values, but they are equal")
}
}
func TestJSON(t *testing.T) {
for _, x := range testTable {
s := x.short
var doc struct {
Amount Decimal `json:"amount"`
}
docStr := `{"amount":"` + s + `"}`
docStrNumber := `{"amount":` + s + `}`
err := json.Unmarshal([]byte(docStr), &doc)
if err != nil {
t.Errorf("error unmarshaling %s: %v", docStr, err)
} else if doc.Amount.String() != s {
t.Errorf("expected %s, got %s (%s, %d)",
s, doc.Amount.String(),
doc.Amount.value.String(), doc.Amount.exp)
}
out, err := json.Marshal(&doc)
if err != nil {
t.Errorf("error marshaling %+v: %v", doc, err)
} else if string(out) != docStr {
t.Errorf("expected %s, got %s", docStr, string(out))
}
// make sure unquoted marshalling works too
MarshalJSONWithoutQuotes = true
out, err = json.Marshal(&doc)
if err != nil {
t.Errorf("error marshaling %+v: %v", doc, err)
} else if string(out) != docStrNumber {
t.Errorf("expected %s, got %s", docStrNumber, string(out))
}
MarshalJSONWithoutQuotes = false
}
}
func TestUnmarshalJSONNull(t *testing.T) {
var doc struct {
Amount Decimal `json:"amount"`
}
docStr := `{"amount": null}`
err := json.Unmarshal([]byte(docStr), &doc)
if err != nil {
t.Errorf("error unmarshaling %s: %v", docStr, err)
} else if !doc.Amount.Equal(Zero) {
t.Errorf("expected Zero, got %s (%s, %d)",
doc.Amount.String(),
doc.Amount.value.String(), doc.Amount.exp)
}
}
func TestBadJSON(t *testing.T) {
for _, testCase := range []string{
"]o_o[",
"{",
`{"amount":""`,
`{"amount":""}`,
`{"amount":"nope"}`,
`0.333`,
} {
var doc struct {
Amount Decimal `json:"amount"`
}
err := json.Unmarshal([]byte(testCase), &doc)
if err == nil {
t.Errorf("expected error, got %+v", doc)
}
}
}
func TestNullDecimalJSON(t *testing.T) {
for _, x := range testTable {
s := x.short
var doc struct {
Amount NullDecimal `json:"amount"`
}
docStr := `{"amount":"` + s + `"}`
docStrNumber := `{"amount":` + s + `}`
err := json.Unmarshal([]byte(docStr), &doc)
if err != nil {
t.Errorf("error unmarshaling %s: %v", docStr, err)
} else {
if !doc.Amount.Valid {
t.Errorf("expected %s to be valid (not NULL), got Valid = false", s)
}
if doc.Amount.Decimal.String() != s {
t.Errorf("expected %s, got %s (%s, %d)",
s, doc.Amount.Decimal.String(),
doc.Amount.Decimal.value.String(), doc.Amount.Decimal.exp)
}
}
out, err := json.Marshal(&doc)
if err != nil {
t.Errorf("error marshaling %+v: %v", doc, err)
} else if string(out) != docStr {
t.Errorf("expected %s, got %s", docStr, string(out))
}
// make sure unquoted marshalling works too
MarshalJSONWithoutQuotes = true
out, err = json.Marshal(&doc)
if err != nil {
t.Errorf("error marshaling %+v: %v", doc, err)
} else if string(out) != docStrNumber {
t.Errorf("expected %s, got %s", docStrNumber, string(out))
}
MarshalJSONWithoutQuotes = false
}
var doc struct {
Amount NullDecimal `json:"amount"`
}
docStr := `{"amount": null}`
err := json.Unmarshal([]byte(docStr), &doc)
if err != nil {
t.Errorf("error unmarshaling %s: %v", docStr, err)
} else if doc.Amount.Valid {
t.Errorf("expected null value to have Valid = false, got Valid = true and Decimal = %s (%s, %d)",
doc.Amount.Decimal.String(),
doc.Amount.Decimal.value.String(), doc.Amount.Decimal.exp)
}
expected := `{"amount":null}`
out, err := json.Marshal(&doc)
if err != nil {
t.Errorf("error marshaling %+v: %v", doc, err)
} else if string(out) != expected {
t.Errorf("expected %s, got %s", expected, string(out))
}
// make sure unquoted marshalling works too
MarshalJSONWithoutQuotes = true
expectedUnquoted := `{"amount":null}`
out, err = json.Marshal(&doc)
if err != nil {
t.Errorf("error marshaling %+v: %v", doc, err)
} else if string(out) != expectedUnquoted {
t.Errorf("expected %s, got %s", expectedUnquoted, string(out))
}
MarshalJSONWithoutQuotes = false
}
func TestNullDecimalBadJSON(t *testing.T) {
for _, testCase := range []string{
"]o_o[",
"{",
`{"amount":""`,
`{"amount":""}`,
`{"amount":"nope"}`,
`{"amount":nope}`,
`0.333`,
} {
var doc struct {
Amount NullDecimal `json:"amount"`
}
err := json.Unmarshal([]byte(testCase), &doc)
if err == nil {
t.Errorf("expected error, got %+v", doc)
}
}
}
func TestXML(t *testing.T) {
for _, x := range testTable {
s := x.short
var doc struct {
XMLName xml.Name `xml:"account"`
Amount Decimal `xml:"amount"`
}
docStr := `<account><amount>` + s + `</amount></account>`
err := xml.Unmarshal([]byte(docStr), &doc)
if err != nil {
t.Errorf("error unmarshaling %s: %v", docStr, err)
} else if doc.Amount.String() != s {
t.Errorf("expected %s, got %s (%s, %d)",
s, doc.Amount.String(),
doc.Amount.value.String(), doc.Amount.exp)
}
out, err := xml.Marshal(&doc)
if err != nil {
t.Errorf("error marshaling %+v: %v", doc, err)
} else if string(out) != docStr {
t.Errorf("expected %s, got %s", docStr, string(out))
}
}
}
func TestBadXML(t *testing.T) {
for _, testCase := range []string{
"o_o",
"<abc",
"<account><amount>7",
`<html><body></body></html>`,
`<account><amount></amount></account>`,
`<account><amount>nope</amount></account>`,
`0.333`,
} {
var doc struct {
XMLName xml.Name `xml:"account"`
Amount Decimal `xml:"amount"`
}
err := xml.Unmarshal([]byte(testCase), &doc)
if err == nil {
t.Errorf("expected error, got %+v", doc)
}
}
}
func TestNullDecimalXML(t *testing.T) {
// test valid values
for _, x := range testTable {
s := x.short
var doc struct {
XMLName xml.Name `xml:"account"`
Amount NullDecimal `xml:"amount"`
}
docStr := `<account><amount>` + s + `</amount></account>`
err := xml.Unmarshal([]byte(docStr), &doc)
if err != nil {
t.Errorf("error unmarshaling %s: %v", docStr, err)
} else if doc.Amount.Decimal.String() != s {
t.Errorf("expected %s, got %s (%s, %d)",
s, doc.Amount.Decimal.String(),
doc.Amount.Decimal.value.String(), doc.Amount.Decimal.exp)
}
out, err := xml.Marshal(&doc)
if err != nil {
t.Errorf("error marshaling %+v: %v", doc, err)
} else if string(out) != docStr {
t.Errorf("expected %s, got %s", docStr, string(out))
}
}
var doc struct {
XMLName xml.Name `xml:"account"`
Amount NullDecimal `xml:"amount"`
}
// test for XML with empty body
docStr := `<account><amount></amount></account>`
err := xml.Unmarshal([]byte(docStr), &doc)
if err != nil {
t.Errorf("error unmarshaling: %s: %v", docStr, err)
} else if doc.Amount.Valid {
t.Errorf("expected null value to have Valid = false, got Valid = true and Decimal = %s (%s, %d)",
doc.Amount.Decimal.String(),
doc.Amount.Decimal.value.String(), doc.Amount.Decimal.exp)
}
expected := `<account><amount></amount></account>`
out, err := xml.Marshal(&doc)
if err != nil {
t.Errorf("error marshaling %+v: %v", doc, err)
} else if string(out) != expected {
t.Errorf("expected %s, got %s", expected, string(out))
}
// test for empty XML
docStr = `<account></account>`
err = xml.Unmarshal([]byte(docStr), &doc)
if err != nil {
t.Errorf("error unmarshaling: %s: %v", docStr, err)
} else if doc.Amount.Valid {
t.Errorf("expected null value to have Valid = false, got Valid = true and Decimal = %s (%s, %d)",
doc.Amount.Decimal.String(),
doc.Amount.Decimal.value.String(), doc.Amount.Decimal.exp)
}
expected = `<account><amount></amount></account>`
out, err = xml.Marshal(&doc)
if err != nil {
t.Errorf("error marshaling %+v: %v", doc, err)
} else if string(out) != expected {
t.Errorf("expected %s, got %s", expected, string(out))
}
}
func TestNullDecimalBadXML(t *testing.T) {
for _, testCase := range []string{
"o_o",
"<abc",
"<account><amount>7",
`<html><body></body></html>`,
`<account><amount>nope</amount></account>`,
`0.333`,
} {
var doc struct {
XMLName xml.Name `xml:"account"`
Amount NullDecimal `xml:"amount"`
}
err := xml.Unmarshal([]byte(testCase), &doc)
if err == nil {
t.Errorf("expected error, got %+v", doc)
}
}
}
func TestDecimal_rescale(t *testing.T) {
type Inp struct {
int int64
exp int32
rescale int32
}
tests := map[Inp]string{
Inp{1234, -3, -5}: "1.234",
Inp{1234, -3, 0}: "1",
Inp{1234, 3, 0}: "1234000",
Inp{1234, -4, -4}: "0.1234",
}
// add negatives
for p, s := range tests {
if p.int > 0 {
tests[Inp{-p.int, p.exp, p.rescale}] = "-" + s
}
}
for input, s := range tests {
d := New(input.int, input.exp).rescale(input.rescale)
if d.String() != s {
t.Errorf("expected %s, got %s (%s, %d)",
s, d.String(),
d.value.String(), d.exp)
}
// test StringScaled
s2 := New(input.int, input.exp).StringScaled(input.rescale)
if s2 != s {
t.Errorf("expected %s, got %s", s, s2)
}
}
}
func TestDecimal_Floor(t *testing.T) {
assertFloor := func(input, expected Decimal) {
got := input.Floor()
if !got.Equal(expected) {
t.Errorf("Floor(%s): got %s, expected %s", input, got, expected)
}
}
type testDataString struct {
input string
expected string
}
testsWithStrings := []testDataString{
{"1.999", "1"},
{"1", "1"},
{"1.01", "1"},
{"0", "0"},
{"0.9", "0"},
{"0.1", "0"},
{"-0.9", "-1"},
{"-0.1", "-1"},
{"-1.00", "-1"},
{"-1.01", "-2"},
{"-1.999", "-2"},
}
for _, test := range testsWithStrings {
expected, _ := NewFromString(test.expected)
input, _ := NewFromString(test.input)
assertFloor(input, expected)
}
type testDataDecimal struct {
input Decimal
expected string
}
testsWithDecimals := []testDataDecimal{
{New(100, -1), "10"},
{New(10, 0), "10"},
{New(1, 1), "10"},
{New(1999, -3), "1"},
{New(101, -2), "1"},
{New(1, 0), "1"},
{New(0, 0), "0"},
{New(9, -1), "0"},
{New(1, -1), "0"},
{New(-1, -1), "-1"},
{New(-9, -1), "-1"},
{New(-1, 0), "-1"},
{New(-101, -2), "-2"},
{New(-1999, -3), "-2"},
}
for _, test := range testsWithDecimals {
expected, _ := NewFromString(test.expected)
assertFloor(test.input, expected)
}
}
func TestDecimal_Ceil(t *testing.T) {
assertCeil := func(input, expected Decimal) {
got := input.Ceil()
if !got.Equal(expected) {
t.Errorf("Ceil(%s): got %s, expected %s", input, got, expected)
}
}
type testDataString struct {
input string
expected string
}
testsWithStrings := []testDataString{
{"1.999", "2"},
{"1", "1"},
{"1.01", "2"},
{"0", "0"},
{"0.9", "1"},
{"0.1", "1"},
{"-0.9", "0"},
{"-0.1", "0"},
{"-1.00", "-1"},
{"-1.01", "-1"},
{"-1.999", "-1"},
}
for _, test := range testsWithStrings {
expected, _ := NewFromString(test.expected)
input, _ := NewFromString(test.input)
assertCeil(input, expected)
}
type testDataDecimal struct {
input Decimal
expected string
}
testsWithDecimals := []testDataDecimal{
{New(100, -1), "10"},
{New(10, 0), "10"},
{New(1, 1), "10"},
{New(1999, -3), "2"},
{New(101, -2), "2"},
{New(1, 0), "1"},
{New(0, 0), "0"},
{New(9, -1), "1"},
{New(1, -1), "1"},
{New(-1, -1), "0"},
{New(-9, -1), "0"},
{New(-1, 0), "-1"},
{New(-101, -2), "-1"},
{New(-1999, -3), "-1"},
}
for _, test := range testsWithDecimals {
expected, _ := NewFromString(test.expected)
assertCeil(test.input, expected)
}
}
func TestDecimal_RoundAndStringFixed(t *testing.T) {
type testData struct {
input string
places int32
expected string
expectedFixed string
}
tests := []testData{
{"1.454", 0, "1", ""},
{"1.454", 1, "1.5", ""},
{"1.454", 2, "1.45", ""},
{"1.454", 3, "1.454", ""},
{"1.454", 4, "1.454", "1.4540"},
{"1.454", 5, "1.454", "1.45400"},
{"1.554", 0, "2", ""},
{"1.554", 1, "1.6", ""},
{"1.554", 2, "1.55", ""},
{"0.554", 0, "1", ""},
{"0.454", 0, "0", ""},
{"0.454", 5, "0.454", "0.45400"},
{"0", 0, "0", ""},
{"0", 1, "0", "0.0"},
{"0", 2, "0", "0.00"},
{"0", -1, "0", ""},
{"5", 2, "5", "5.00"},
{"5", 1, "5", "5.0"},
{"5", 0, "5", ""},
{"500", 2, "500", "500.00"},
{"545", -1, "550", ""},
{"545", -2, "500", ""},
{"545", -3, "1000", ""},
{"545", -4, "0", ""},
{"499", -3, "0", ""},
{"499", -4, "0", ""},
}
// add negative number tests
for _, test := range tests {
expected := test.expected
if expected != "0" {
expected = "-" + expected
}
expectedStr := test.expectedFixed
if strings.ContainsAny(expectedStr, "123456789") && expectedStr != "" {
expectedStr = "-" + expectedStr
}
tests = append(tests,
testData{"-" + test.input, test.places, expected, expectedStr})
}
for _, test := range tests {
d, err := NewFromString(test.input)
if err != nil {
t.Fatal(err)
}
// test Round
expected, err := NewFromString(test.expected)
if err != nil {
t.Fatal(err)
}
got := d.Round(test.places)
if !got.Equal(expected) {
t.Errorf("Rounding %s to %d places, got %s, expected %s",
d, test.places, got, expected)
}
// test StringFixed
if test.expectedFixed == "" {
test.expectedFixed = test.expected
}
gotStr := d.StringFixed(test.places)
if gotStr != test.expectedFixed {
t.Errorf("(%s).StringFixed(%d): got %s, expected %s",
d, test.places, gotStr, test.expectedFixed)
}
}
}
func TestDecimal_RoundCeilAndStringFixed(t *testing.T) {
type testData struct {
input string
places int32
expected string
expectedFixed string
}
tests := []testData{
{"1.454", 0, "2", ""},
{"1.454", 1, "1.5", ""},
{"1.454", 2, "1.46", ""},
{"1.454", 3, "1.454", ""},
{"1.454", 4, "1.454", "1.4540"},
{"1.454", 5, "1.454", "1.45400"},
{"1.554", 0, "2", ""},
{"1.554", 1, "1.6", ""},
{"1.554", 2, "1.56", ""},
{"0.554", 0, "1", ""},
{"0.454", 0, "1", ""},
{"0.454", 5, "0.454", "0.45400"},
{"0", 0, "0", ""},
{"0", 1, "0", "0.0"},
{"0", 2, "0", "0.00"},
{"0", -1, "0", ""},
{"5", 2, "5", "5.00"},
{"5", 1, "5", "5.0"},
{"5", 0, "5", ""},
{"500", 2, "500", "500.00"},
{"500", -2, "500", ""},
{"545", -1, "550", ""},
{"545", -2, "600", ""},
{"545", -3, "1000", ""},
{"545", -4, "10000", ""},
{"499", -3, "1000", ""},
{"499", -4, "10000", ""},
{"1.1001", 2, "1.11", ""},
{"-1.1001", 2, "-1.10", ""},
{"-1.454", 0, "-1", ""},
{"-1.454", 1, "-1.4", ""},
{"-1.454", 2, "-1.45", ""},
{"-1.454", 3, "-1.454", ""},
{"-1.454", 4, "-1.454", "-1.4540"},
{"-1.454", 5, "-1.454", "-1.45400"},
{"-1.554", 0, "-1", ""},
{"-1.554", 1, "-1.5", ""},
{"-1.554", 2, "-1.55", ""},
{"-0.554", 0, "0", ""},
{"-0.454", 0, "0", ""},
{"-0.454", 5, "-0.454", "-0.45400"},
{"-5", 2, "-5", "-5.00"},
{"-5", 1, "-5", "-5.0"},
{"-5", 0, "-5", ""},
{"-500", 2, "-500", "-500.00"},
{"-500", -2, "-500", ""},
{"-545", -1, "-540", ""},
{"-545", -2, "-500", ""},
{"-545", -3, "0", ""},
{"-545", -4, "0", ""},
{"-499", -3, "0", ""},
{"-499", -4, "0", ""},
}
for _, test := range tests {
d, err := NewFromString(test.input)
if err != nil {
t.Fatal(err)
}
// test Round
expected, err := NewFromString(test.expected)
if err != nil {
t.Fatal(err)
}
got := d.RoundCeil(test.places)
if !got.Equal(expected) {
t.Errorf("Rounding ceil %s to %d places, got %s, expected %s",
d, test.places, got, expected)
}
// test StringFixed
if test.expectedFixed == "" {
test.expectedFixed = test.expected
}
gotStr := got.StringFixed(test.places)
if gotStr != test.expectedFixed {
t.Errorf("(%s).StringFixed(%d): got %s, expected %s",
d, test.places, gotStr, test.expectedFixed)
}
}
}
func TestDecimal_RoundFloorAndStringFixed(t *testing.T) {
type testData struct {
input string
places int32
expected string
expectedFixed string
}
tests := []testData{
{"1.454", 0, "1", ""},
{"1.454", 1, "1.4", ""},
{"1.454", 2, "1.45", ""},
{"1.454", 3, "1.454", ""},
{"1.454", 4, "1.454", "1.4540"},
{"1.454", 5, "1.454", "1.45400"},
{"1.554", 0, "1", ""},
{"1.554", 1, "1.5", ""},
{"1.554", 2, "1.55", ""},
{"0.554", 0, "0", ""},
{"0.454", 0, "0", ""},
{"0.454", 5, "0.454", "0.45400"},
{"0", 0, "0", ""},
{"0", 1, "0", "0.0"},
{"0", 2, "0", "0.00"},
{"0", -1, "0", ""},
{"5", 2, "5", "5.00"},
{"5", 1, "5", "5.0"},
{"5", 0, "5", ""},
{"500", 2, "500", "500.00"},
{"500", -2, "500", ""},
{"545", -1, "540", ""},
{"545", -2, "500", ""},
{"545", -3, "0", ""},
{"545", -4, "0", ""},
{"499", -3, "0", ""},
{"499", -4, "0", ""},
{"1.1001", 2, "1.10", ""},
{"-1.1001", 2, "-1.11", ""},
{"-1.454", 0, "-2", ""},
{"-1.454", 1, "-1.5", ""},
{"-1.454", 2, "-1.46", ""},
{"-1.454", 3, "-1.454", ""},
{"-1.454", 4, "-1.454", "-1.4540"},
{"-1.454", 5, "-1.454", "-1.45400"},
{"-1.554", 0, "-2", ""},
{"-1.554", 1, "-1.6", ""},
{"-1.554", 2, "-1.56", ""},
{"-0.554", 0, "-1", ""},
{"-0.454", 0, "-1", ""},
{"-0.454", 5, "-0.454", "-0.45400"},
{"-5", 2, "-5", "-5.00"},
{"-5", 1, "-5", "-5.0"},
{"-5", 0, "-5", ""},
{"-500", 2, "-500", "-500.00"},
{"-500", -2, "-500", ""},
{"-545", -1, "-550", ""},
{"-545", -2, "-600", ""},
{"-545", -3, "-1000", ""},
{"-545", -4, "-10000", ""},
{"-499", -3, "-1000", ""},
{"-499", -4, "-10000", ""},
}
for _, test := range tests {
d, err := NewFromString(test.input)
if err != nil {
t.Fatal(err)
}
// test Round
expected, err := NewFromString(test.expected)
if err != nil {
t.Fatal(err)
}
got := d.RoundFloor(test.places)
if !got.Equal(expected) {
t.Errorf("Rounding floor %s to %d places, got %s, expected %s",
d, test.places, got, expected)
}
// test StringFixed
if test.expectedFixed == "" {
test.expectedFixed = test.expected
}
gotStr := got.StringFixed(test.places)
if gotStr != test.expectedFixed {
t.Errorf("(%s).StringFixed(%d): got %s, expected %s",
d, test.places, gotStr, test.expectedFixed)
}
}
}
func TestDecimal_RoundUpAndStringFixed(t *testing.T) {
type testData struct {
input string
places int32
expected string
expectedFixed string
}
tests := []testData{
{"1.454", 0, "2", ""},
{"1.454", 1, "1.5", ""},
{"1.454", 2, "1.46", ""},
{"1.454", 3, "1.454", ""},
{"1.454", 4, "1.454", "1.4540"},
{"1.454", 5, "1.454", "1.45400"},
{"1.554", 0, "2", ""},
{"1.554", 1, "1.6", ""},
{"1.554", 2, "1.56", ""},
{"0.554", 0, "1", ""},
{"0.454", 0, "1", ""},
{"0.454", 5, "0.454", "0.45400"},
{"0", 0, "0", ""},
{"0", 1, "0", "0.0"},
{"0", 2, "0", "0.00"},
{"0", -1, "0", ""},
{"5", 2, "5", "5.00"},
{"5", 1, "5", "5.0"},
{"5", 0, "5", ""},
{"500", 2, "500", "500.00"},
{"500", -2, "500", ""},
{"545", -1, "550", ""},
{"545", -2, "600", ""},
{"545", -3, "1000", ""},
{"545", -4, "10000", ""},
{"499", -3, "1000", ""},
{"499", -4, "10000", ""},
{"1.1001", 2, "1.11", ""},
{"-1.1001", 2, "-1.11", ""},
{"-1.454", 0, "-2", ""},
{"-1.454", 1, "-1.5", ""},
{"-1.454", 2, "-1.46", ""},
{"-1.454", 3, "-1.454", ""},
{"-1.454", 4, "-1.454", "-1.4540"},
{"-1.454", 5, "-1.454", "-1.45400"},
{"-1.554", 0, "-2", ""},
{"-1.554", 1, "-1.6", ""},
{"-1.554", 2, "-1.56", ""},
{"-0.554", 0, "-1", ""},
{"-0.454", 0, "-1", ""},
{"-0.454", 5, "-0.454", "-0.45400"},
{"-5", 2, "-5", "-5.00"},
{"-5", 1, "-5", "-5.0"},
{"-5", 0, "-5", ""},
{"-500", 2, "-500", "-500.00"},
{"-500", -2, "-500", ""},
{"-545", -1, "-550", ""},
{"-545", -2, "-600", ""},
{"-545", -3, "-1000", ""},
{"-545", -4, "-10000", ""},
{"-499", -3, "-1000", ""},
{"-499", -4, "-10000", ""},
}
for _, test := range tests {
d, err := NewFromString(test.input)
if err != nil {
t.Fatal(err)
}
// test Round
expected, err := NewFromString(test.expected)
if err != nil {
t.Fatal(err)
}
got := d.RoundUp(test.places)
if !got.Equal(expected) {
t.Errorf("Rounding up %s to %d places, got %s, expected %s",
d, test.places, got, expected)
}
// test StringFixed
if test.expectedFixed == "" {
test.expectedFixed = test.expected
}
gotStr := got.StringFixed(test.places)
if gotStr != test.expectedFixed {
t.Errorf("(%s).StringFixed(%d): got %s, expected %s",
d, test.places, gotStr, test.expectedFixed)
}
}
}
func TestDecimal_RoundDownAndStringFixed(t *testing.T) {
type testData struct {
input string
places int32
expected string
expectedFixed string
}
tests := []testData{
{"1.454", 0, "1", ""},
{"1.454", 1, "1.4", ""},
{"1.454", 2, "1.45", ""},
{"1.454", 3, "1.454", ""},
{"1.454", 4, "1.454", "1.4540"},
{"1.454", 5, "1.454", "1.45400"},
{"1.554", 0, "1", ""},
{"1.554", 1, "1.5", ""},
{"1.554", 2, "1.55", ""},
{"0.554", 0, "0", ""},
{"0.454", 0, "0", ""},
{"0.454", 5, "0.454", "0.45400"},
{"0", 0, "0", ""},
{"0", 1, "0", "0.0"},
{"0", 2, "0", "0.00"},
{"0", -1, "0", ""},
{"5", 2, "5", "5.00"},
{"5", 1, "5", "5.0"},
{"5", 0, "5", ""},
{"500", 2, "500", "500.00"},
{"500", -2, "500", ""},
{"545", -1, "540", ""},
{"545", -2, "500", ""},
{"545", -3, "0", ""},
{"545", -4, "0", ""},
{"499", -3, "0", ""},
{"499", -4, "0", ""},
{"1.1001", 2, "1.10", ""},
{"-1.1001", 2, "-1.10", ""},
{"-1.454", 0, "-1", ""},
{"-1.454", 1, "-1.4", ""},
{"-1.454", 2, "-1.45", ""},
{"-1.454", 3, "-1.454", ""},
{"-1.454", 4, "-1.454", "-1.4540"},
{"-1.454", 5, "-1.454", "-1.45400"},
{"-1.554", 0, "-1", ""},
{"-1.554", 1, "-1.5", ""},
{"-1.554", 2, "-1.55", ""},
{"-0.554", 0, "0", ""},
{"-0.454", 0, "0", ""},
{"-0.454", 5, "-0.454", "-0.45400"},
{"-5", 2, "-5", "-5.00"},
{"-5", 1, "-5", "-5.0"},
{"-5", 0, "-5", ""},
{"-500", 2, "-500", "-500.00"},
{"-500", -2, "-500", ""},
{"-545", -1, "-540", ""},
{"-545", -2, "-500", ""},
{"-545", -3, "0", ""},
{"-545", -4, "0", ""},
{"-499", -3, "0", ""},
{"-499", -4, "0", ""},
}
for _, test := range tests {
d, err := NewFromString(test.input)
if err != nil {
t.Fatal(err)
}
// test Round
expected, err := NewFromString(test.expected)
if err != nil {
t.Fatal(err)
}
got := d.RoundDown(test.places)
if !got.Equal(expected) {
t.Errorf("Rounding down %s to %d places, got %s, expected %s",
d, test.places, got, expected)
}
// test StringFixed
if test.expectedFixed == "" {
test.expectedFixed = test.expected
}
gotStr := got.StringFixed(test.places)
if gotStr != test.expectedFixed {
t.Errorf("(%s).StringFixed(%d): got %s, expected %s",
d, test.places, gotStr, test.expectedFixed)
}
}
}
func TestDecimal_BankRoundAndStringFixed(t *testing.T) {
type testData struct {
input string
places int32
expected string
expectedFixed string
}
tests := []testData{
{"1.454", 0, "1", ""},
{"1.454", 1, "1.5", ""},
{"1.454", 2, "1.45", ""},
{"1.454", 3, "1.454", ""},
{"1.454", 4, "1.454", "1.4540"},
{"1.454", 5, "1.454", "1.45400"},
{"1.554", 0, "2", ""},
{"1.554", 1, "1.6", ""},
{"1.554", 2, "1.55", ""},
{"0.554", 0, "1", ""},
{"0.454", 0, "0", ""},
{"0.454", 5, "0.454", "0.45400"},
{"0", 0, "0", ""},
{"0", 1, "0", "0.0"},
{"0", 2, "0", "0.00"},
{"0", -1, "0", ""},
{"5", 2, "5", "5.00"},
{"5", 1, "5", "5.0"},
{"5", 0, "5", ""},
{"500", 2, "500", "500.00"},
{"545", -2, "500", ""},
{"545", -3, "1000", ""},
{"545", -4, "0", ""},
{"499", -3, "0", ""},
{"499", -4, "0", ""},
{"1.45", 1, "1.4", ""},
{"1.55", 1, "1.6", ""},
{"1.65", 1, "1.6", ""},
{"545", -1, "540", ""},
{"565", -1, "560", ""},
{"555", -1, "560", ""},
}
// add negative number tests
for _, test := range tests {
expected := test.expected
if expected != "0" {
expected = "-" + expected
}
expectedStr := test.expectedFixed
if strings.ContainsAny(expectedStr, "123456789") && expectedStr != "" {
expectedStr = "-" + expectedStr
}
tests = append(tests,
testData{"-" + test.input, test.places, expected, expectedStr})
}
for _, test := range tests {
d, err := NewFromString(test.input)
if err != nil {
panic(err)
}
// test Round
expected, err := NewFromString(test.expected)
if err != nil {
panic(err)
}
got := d.RoundBank(test.places)
if !got.Equal(expected) {
t.Errorf("Bank Rounding %s to %d places, got %s, expected %s",
d, test.places, got, expected)
}
// test StringFixed
if test.expectedFixed == "" {
test.expectedFixed = test.expected
}
gotStr := d.StringFixedBank(test.places)
if gotStr != test.expectedFixed {
t.Errorf("(%s).StringFixed(%d): got %s, expected %s",
d, test.places, gotStr, test.expectedFixed)
}
}
}
func TestDecimal_Uninitialized(t *testing.T) {
a := Decimal{}
b := Decimal{}
decs := []Decimal{
a,
a.rescale(10),
a.Abs(),
a.Add(b),
a.Sub(b),
a.Mul(b),
a.Shift(0),
a.Div(New(1, -1)),
a.Round(2),
a.Floor(),
a.Ceil(),
a.Truncate(2),
}
for _, d := range decs {
if d.String() != "0" {
t.Errorf("expected 0, got %s", d.String())
}
if d.StringFixed(3) != "0.000" {
t.Errorf("expected 0, got %s", d.StringFixed(3))
}
if d.StringScaled(-2) != "0" {
t.Errorf("expected 0, got %s", d.StringScaled(-2))
}
}
if a.Cmp(b) != 0 {
t.Errorf("a != b")
}
if a.Sign() != 0 {
t.Errorf("a.Sign() != 0")
}
if a.Exponent() != 0 {
t.Errorf("a.Exponent() != 0")
}
if a.IntPart() != 0 {
t.Errorf("a.IntPar() != 0")
}
f, _ := a.Float64()
if f != 0 {
t.Errorf("a.Float64() != 0")
}
if a.Rat().RatString() != "0" {
t.Errorf("a.Rat() != 0, got %s", a.Rat().RatString())
}
}
func TestDecimal_Add(t *testing.T) {
type Inp struct {
a string
b string
}
inputs := map[Inp]string{
Inp{"2", "3"}: "5",
Inp{"2454495034", "3451204593"}: "5905699627",
Inp{"24544.95034", ".3451204593"}: "24545.2954604593",
Inp{".1", ".1"}: "0.2",
Inp{".1", "-.1"}: "0",
Inp{"0", "1.001"}: "1.001",
}
for inp, res := range inputs {
a, err := NewFromString(inp.a)
if err != nil {
t.FailNow()
}
b, err := NewFromString(inp.b)
if err != nil {
t.FailNow()
}
c := a.Add(b)
if c.String() != res {
t.Errorf("expected %s, got %s", res, c.String())
}
}
}
func TestDecimal_Sub(t *testing.T) {
type Inp struct {
a string
b string
}
inputs := map[Inp]string{
Inp{"2", "3"}: "-1",
Inp{"12", "3"}: "9",
Inp{"-2", "9"}: "-11",
Inp{"2454495034", "3451204593"}: "-996709559",
Inp{"24544.95034", ".3451204593"}: "24544.6052195407",
Inp{".1", "-.1"}: "0.2",
Inp{".1", ".1"}: "0",
Inp{"0", "1.001"}: "-1.001",
Inp{"1.001", "0"}: "1.001",
Inp{"2.3", ".3"}: "2",
}
for inp, res := range inputs {
a, err := NewFromString(inp.a)
if err != nil {
t.FailNow()
}
b, err := NewFromString(inp.b)
if err != nil {
t.FailNow()
}
c := a.Sub(b)
if c.String() != res {
t.Errorf("expected %s, got %s", res, c.String())
}
}
}
func TestDecimal_Neg(t *testing.T) {
inputs := map[string]string{
"0": "0",
"10": "-10",
"5.56": "-5.56",
"-10": "10",
"-5.56": "5.56",
}
for inp, res := range inputs {
a, err := NewFromString(inp)
if err != nil {
t.FailNow()
}
b := a.Neg()
if b.String() != res {
t.Errorf("expected %s, got %s", res, b.String())
}
}
}
func TestDecimal_NegFromEmpty(t *testing.T) {
a := Decimal{}
b := a.Neg()
if b.String() != "0" {
t.Errorf("expected %s, got %s", "0", b)
}
}
func TestDecimal_Mul(t *testing.T) {
type Inp struct {
a string
b string
}
inputs := map[Inp]string{
Inp{"2", "3"}: "6",
Inp{"2454495034", "3451204593"}: "8470964534836491162",
Inp{"24544.95034", ".3451204593"}: "8470.964534836491162",
Inp{".1", ".1"}: "0.01",
Inp{"0", "1.001"}: "0",
}
for inp, res := range inputs {
a, err := NewFromString(inp.a)
if err != nil {
t.FailNow()
}
b, err := NewFromString(inp.b)
if err != nil {
t.FailNow()
}
c := a.Mul(b)
if c.String() != res {
t.Errorf("expected %s, got %s", res, c.String())
}
}
// positive scale
c := New(1234, 5).Mul(New(45, -1))
if c.String() != "555300000" {
t.Errorf("Expected %s, got %s", "555300000", c.String())
}
}
func TestDecimal_Shift(t *testing.T) {
type Inp struct {
a string
b int32
}
inputs := map[Inp]string{
Inp{"6", 3}: "6000",
Inp{"10", -2}: "0.1",
Inp{"2.2", 1}: "22",
Inp{"-2.2", -1}: "-0.22",
Inp{"12.88", 5}: "1288000",
Inp{"-10234274355545544493", -3}: "-10234274355545544.493",
Inp{"-4612301402398.4753343454", 5}: "-461230140239847533.43454",
}
for inp, expectedStr := range inputs {
num, _ := NewFromString(inp.a)
got := num.Shift(inp.b)
expected, _ := NewFromString(expectedStr)
if !got.Equal(expected) {
t.Errorf("expected %v when shifting %v by %v, got %v",
expected, num, inp.b, got)
}
}
}
func TestDecimal_Div(t *testing.T) {
type Inp struct {
a string
b string
}
inputs := map[Inp]string{
Inp{"6", "3"}: "2",
Inp{"10", "2"}: "5",
Inp{"2.2", "1.1"}: "2",
Inp{"-2.2", "-1.1"}: "2",
Inp{"12.88", "5.6"}: "2.3",
Inp{"1023427554493", "43432632"}: "23563.5628642767953828", // rounded
Inp{"1", "434324545566634"}: "0.0000000000000023",
Inp{"1", "3"}: "0.3333333333333333",
Inp{"2", "3"}: "0.6666666666666667", // rounded
Inp{"10000", "3"}: "3333.3333333333333333",
Inp{"10234274355545544493", "-3"}: "-3411424785181848164.3333333333333333",
Inp{"-4612301402398.4753343454", "23.5"}: "-196268144782.9138440146978723",
}
for inp, expectedStr := range inputs {
num, err := NewFromString(inp.a)
if err != nil {
t.FailNow()
}
denom, err := NewFromString(inp.b)
if err != nil {
t.FailNow()
}
got := num.Div(denom)
expected, _ := NewFromString(expectedStr)
if !got.Equal(expected) {
t.Errorf("expected %v when dividing %v by %v, got %v",
expected, num, denom, got)
}
got2 := num.DivRound(denom, int32(DivisionPrecision))
if !got2.Equal(expected) {
t.Errorf("expected %v on DivRound (%v,%v), got %v", expected, num, denom, got2)
}
}
type Inp2 struct {
n int64
exp int32
n2 int64
exp2 int32
}
// test code path where exp > 0
inputs2 := map[Inp2]string{
Inp2{124, 10, 3, 1}: "41333333333.3333333333333333",
Inp2{124, 10, 3, 0}: "413333333333.3333333333333333",
Inp2{124, 10, 6, 1}: "20666666666.6666666666666667",
Inp2{124, 10, 6, 0}: "206666666666.6666666666666667",
Inp2{10, 10, 10, 1}: "1000000000",
}
for inp, expectedAbs := range inputs2 {
for i := -1; i <= 1; i += 2 {
for j := -1; j <= 1; j += 2 {
n := inp.n * int64(i)
n2 := inp.n2 * int64(j)
num := New(n, inp.exp)
denom := New(n2, inp.exp2)
expected := expectedAbs
if i != j {
expected = "-" + expectedAbs
}
got := num.Div(denom)
if got.String() != expected {
t.Errorf("expected %s when dividing %v by %v, got %v",
expected, num, denom, got)
}
}
}
}
}
func TestDecimal_QuoRem(t *testing.T) {
type Inp4 struct {
d string
d2 string
exp int32
q string
r string
}
cases := []Inp4{
{"10", "1", 0, "10", "0"},
{"1", "10", 0, "0", "1"},
{"1", "4", 2, "0.25", "0"},
{"1", "8", 2, "0.12", "0.04"},
{"10", "3", 1, "3.3", "0.1"},
{"100", "3", 1, "33.3", "0.1"},
{"1000", "10", -3, "0", "1000"},
{"1e-3", "2e-5", 0, "50", "0"},
{"1e-3", "2e-3", 1, "0.5", "0"},
{"4e-3", "0.8", 4, "5e-3", "0"},
{"4.1e-3", "0.8", 3, "5e-3", "1e-4"},
{"-4", "-3", 0, "1", "-1"},
{"-4", "3", 0, "-1", "-1"},
}
for _, inp4 := range cases {
d, _ := NewFromString(inp4.d)
d2, _ := NewFromString(inp4.d2)
prec := inp4.exp
q, r := d.QuoRem(d2, prec)
expectedQ, _ := NewFromString(inp4.q)
expectedR, _ := NewFromString(inp4.r)
if !q.Equal(expectedQ) || !r.Equal(expectedR) {
t.Errorf("bad QuoRem division %s , %s , %d got %v, %v expected %s , %s",
inp4.d, inp4.d2, prec, q, r, inp4.q, inp4.r)
}
if !d.Equal(d2.Mul(q).Add(r)) {
t.Errorf("not fitting: d=%v, d2= %v, prec=%d, q=%v, r=%v",
d, d2, prec, q, r)
}
if !q.Equal(q.Truncate(prec)) {
t.Errorf("quotient wrong precision: d=%v, d2= %v, prec=%d, q=%v, r=%v",
d, d2, prec, q, r)
}
if r.Abs().Cmp(d2.Abs().Mul(New(1, -prec))) >= 0 {
t.Errorf("remainder too large: d=%v, d2= %v, prec=%d, q=%v, r=%v",
d, d2, prec, q, r)
}
if r.value.Sign()*d.value.Sign() < 0 {
t.Errorf("signum of divisor and rest do not match: d=%v, d2= %v, prec=%d, q=%v, r=%v",
d, d2, prec, q, r)
}
}
}
type DivTestCase struct {
d Decimal
d2 Decimal
prec int32
}
func createDivTestCases() []DivTestCase {
res := make([]DivTestCase, 0)
var n int32 = 5
a := []int{1, 2, 3, 6, 7, 10, 100, 14, 5, 400, 0, 1000000, 1000000 + 1, 1000000 - 1}
for s := -1; s < 2; s = s + 2 { // 2
for s2 := -1; s2 < 2; s2 = s2 + 2 { // 2
for e1 := -n; e1 <= n; e1++ { // 2n+1
for e2 := -n; e2 <= n; e2++ { // 2n+1
var prec int32
for prec = -n; prec <= n; prec++ { // 2n+1
for _, v1 := range a { // 11
for _, v2 := range a { // 11, even if 0 is skipped
sign1 := New(int64(s), 0)
sign2 := New(int64(s2), 0)
d := sign1.Mul(New(int64(v1), e1))
d2 := sign2.Mul(New(int64(v2), e2))
res = append(res, DivTestCase{d, d2, prec})
}
}
}
}
}
}
}
return res
}
func TestDecimal_QuoRem2(t *testing.T) {
for _, tc := range createDivTestCases() {
d := tc.d
if sign(tc.d2) == 0 {
continue
}
d2 := tc.d2
prec := tc.prec
q, r := d.QuoRem(d2, prec)
// rule 1: d = d2*q +r
if !d.Equal(d2.Mul(q).Add(r)) {
t.Errorf("not fitting, d=%v, d2=%v, prec=%d, q=%v, r=%v",
d, d2, prec, q, r)
}
// rule 2: q is integral multiple of 10^(-prec)
if !q.Equal(q.Truncate(prec)) {
t.Errorf("quotient wrong precision, d=%v, d2=%v, prec=%d, q=%v, r=%v",
d, d2, prec, q, r)
}
// rule 3: abs(r)<abs(d) * 10^(-prec)
if r.Abs().Cmp(d2.Abs().Mul(New(1, -prec))) >= 0 {
t.Errorf("remainder too large, d=%v, d2=%v, prec=%d, q=%v, r=%v",
d, d2, prec, q, r)
}
// rule 4: r and d have the same sign
if r.value.Sign()*d.value.Sign() < 0 {
t.Errorf("signum of divisor and rest do not match, "+
"d=%v, d2=%v, prec=%d, q=%v, r=%v",
d, d2, prec, q, r)
}
}
}
// this is the old Div method from decimal
// Div returns d / d2. If it doesn't divide exactly, the result will have
// DivisionPrecision digits after the decimal point.
func (d Decimal) DivOld(d2 Decimal, prec int) Decimal {
// NOTE(vadim): division is hard, use Rat to do it
ratNum := d.Rat()
ratDenom := d2.Rat()
quoRat := big.NewRat(0, 1).Quo(ratNum, ratDenom)
// HACK(vadim): converting from Rat to Decimal inefficiently for now
ret, err := NewFromString(quoRat.FloatString(prec))
if err != nil {
panic(err) // this should never happen
}
return ret
}
func sign(d Decimal) int {
return d.value.Sign()
}
// rules for rounded divide, rounded to integer
// rounded_divide(d,d2) = q
// sign q * sign (d/d2) >= 0
// for d and d2 >0 :
// q is already rounded
// q = d/d2 + r , with r > -0.5 and r <= 0.5
// thus q-d/d2 = r, with r > -0.5 and r <= 0.5
// and d2 q -d = r d2 with r d2 > -d2/2 and r d2 <= d2/2
// and 2 (d2 q -d) = x with x > -d2 and x <= d2
// if we factor in precision then x > -d2 * 10^(-precision) and x <= d2 * 10(-precision)
func TestDecimal_DivRound(t *testing.T) {
cases := []struct {
d string
d2 string
prec int32
result string
}{
{"2", "2", 0, "1"},
{"1", "2", 0, "1"},
{"-1", "2", 0, "-1"},
{"-1", "-2", 0, "1"},
{"1", "-2", 0, "-1"},
{"1", "-20", 1, "-0.1"},
{"1", "-20", 2, "-0.05"},
{"1", "20.0000000000000000001", 1, "0"},
{"1", "19.9999999999999999999", 1, "0.1"},
}
for _, s := range cases {
d, _ := NewFromString(s.d)
d2, _ := NewFromString(s.d2)
result, _ := NewFromString(s.result)
prec := s.prec
q := d.DivRound(d2, prec)
if sign(q)*sign(d)*sign(d2) < 0 {
t.Errorf("sign of quotient wrong, got: %v/%v is about %v", d, d2, q)
}
x := q.Mul(d2).Abs().Sub(d.Abs()).Mul(New(2, 0))
if x.Cmp(d2.Abs().Mul(New(1, -prec))) > 0 {
t.Errorf("wrong rounding, got: %v/%v prec=%d is about %v", d, d2, prec, q)
}
if x.Cmp(d2.Abs().Mul(New(-1, -prec))) <= 0 {
t.Errorf("wrong rounding, got: %v/%v prec=%d is about %v", d, d2, prec, q)
}
if !q.Equal(result) {
t.Errorf("rounded division wrong %s / %s scale %d = %s, got %v", s.d, s.d2, prec, s.result, q)
}
}
}
func TestDecimal_DivRound2(t *testing.T) {
for _, tc := range createDivTestCases() {
d := tc.d
if sign(tc.d2) == 0 {
continue
}
d2 := tc.d2
prec := tc.prec
q := d.DivRound(d2, prec)
if sign(q)*sign(d)*sign(d2) < 0 {
t.Errorf("sign of quotient wrong, got: %v/%v is about %v", d, d2, q)
}
x := q.Mul(d2).Abs().Sub(d.Abs()).Mul(New(2, 0))
if x.Cmp(d2.Abs().Mul(New(1, -prec))) > 0 {
t.Errorf("wrong rounding, got: %v/%v prec=%d is about %v", d, d2, prec, q)
}
if x.Cmp(d2.Abs().Mul(New(-1, -prec))) <= 0 {
t.Errorf("wrong rounding, got: %v/%v prec=%d is about %v", d, d2, prec, q)
}
}
}
func TestDecimal_RoundCash(t *testing.T) {
tests := []struct {
d string
interval uint8
result string
}{
{"3.44", 5, "3.45"},
{"3.43", 5, "3.45"},
{"3.42", 5, "3.40"},
{"3.425", 5, "3.45"},
{"3.47", 5, "3.45"},
{"3.478", 5, "3.50"},
{"3.48", 5, "3.50"},
{"348", 5, "348"},
{"3.23", 10, "3.20"},
{"3.33", 10, "3.30"},
{"3.53", 10, "3.50"},
{"3.949", 10, "3.90"},
{"3.95", 10, "4.00"},
{"395", 10, "395"},
{"3.23", 25, "3.25"},
{"3.33", 25, "3.25"},
{"3.53", 25, "3.50"},
{"3.93", 25, "4.00"},
{"3.41", 25, "3.50"},
{"3.249", 50, "3.00"},
{"3.33", 50, "3.50"},
{"3.749999999", 50, "3.50"},
{"3.75", 50, "4.00"},
{"3.93", 50, "4.00"},
{"393", 50, "393"},
{"3.249", 100, "3.00"},
{"3.49999", 100, "3.00"},
{"3.50", 100, "4.00"},
{"3.75", 100, "4.00"},
{"3.93", 100, "4.00"},
{"393", 100, "393"},
}
for i, test := range tests {
d, _ := NewFromString(test.d)
haveRounded := d.RoundCash(test.interval)
result, _ := NewFromString(test.result)
if !haveRounded.Equal(result) {
t.Errorf("Index %d: Cash rounding for %q interval %d want %q, have %q", i, test.d, test.interval, test.result, haveRounded)
}
}
}
func TestDecimal_RoundCash_Panic(t *testing.T) {
defer func() {
if r := recover(); r != nil {
if have, ok := r.(string); ok {
const want = "Decimal does not support this Cash rounding interval `231`. Supported: 5, 10, 25, 50, 100"
if want != have {
t.Errorf("\nWant: %q\nHave: %q", want, have)
}
} else {
t.Errorf("Panic should contain an error string but got:\n%+v", r)
}
} else {
t.Error("Expecting a panic but got nothing")
}
}()
d, _ := NewFromString("1")
d.RoundCash(231)
}
func TestDecimal_Mod(t *testing.T) {
type Inp struct {
a string
b string
}
inputs := map[Inp]string{
Inp{"3", "2"}: "1",
Inp{"3451204593", "2454495034"}: "996709559",
Inp{"9999999999", "1275"}: "324",
Inp{"9999999999.9999998", "1275.49"}: "239.2399998",
Inp{"24544.95034", "0.3451204593"}: "0.3283950433",
Inp{"0.499999999999999999", "0.25"}: "0.249999999999999999",
Inp{"0.989512958912895912", "0.000001"}: "0.000000958912895912",
Inp{"0.1", "0.1"}: "0",
Inp{"0", "1.001"}: "0",
Inp{"-7.5", "2"}: "-1.5",
Inp{"7.5", "-2"}: "1.5",
Inp{"-7.5", "-2"}: "-1.5",
Inp{"41", "21"}: "20",
Inp{"400000000001", "200000000001"}: "200000000000",
}
for inp, res := range inputs {
a, err := NewFromString(inp.a)
if err != nil {
t.FailNow()
}
b, err := NewFromString(inp.b)
if err != nil {
t.FailNow()
}
c := a.Mod(b)
if c.String() != res {
t.Errorf("expected %s, got %s", res, c.String())
}
}
}
func TestDecimal_Overflow(t *testing.T) {
if !didPanic(func() { New(1, math.MinInt32).Mul(New(1, math.MinInt32)) }) {
t.Fatalf("should have gotten an overflow panic")
}
if !didPanic(func() { New(1, math.MaxInt32).Mul(New(1, math.MaxInt32)) }) {
t.Fatalf("should have gotten an overflow panic")
}
}
func TestDecimal_ExtremeValues(t *testing.T) {
// NOTE(vadim): this test takes pretty much forever
if testing.Short() {
t.Skip()
}
// NOTE(vadim): Seriously, the numbers involved are so large that this
// test will take way too long, so mark it as success if it takes over
// 1 second. The way this test typically fails (integer overflow) is that
// a wrong result appears quickly, so if it takes a long time then it is
// probably working properly.
// Why even bother testing this? Completeness, I guess. -Vadim
const timeLimit = 1 * time.Second
test := func(f func()) {
c := make(chan bool)
go func() {
f()
close(c)
}()
select {
case <-c:
case <-time.After(timeLimit):
}
}
test(func() {
got := New(123, math.MinInt32).Floor()
if !got.Equal(NewFromFloat(0)) {
t.Errorf("Error: got %s, expected 0", got)
}
})
test(func() {
got := New(123, math.MinInt32).Ceil()
if !got.Equal(NewFromFloat(1)) {
t.Errorf("Error: got %s, expected 1", got)
}
})
test(func() {
got := New(123, math.MinInt32).Rat().FloatString(10)
expected := "0.0000000000"
if got != expected {
t.Errorf("Error: got %s, expected %s", got, expected)
}
})
}
func TestIntPart(t *testing.T) {
for _, testCase := range []struct {
Dec string
IntPart int64
}{
{"0.01", 0},
{"12.1", 12},
{"9999.999", 9999},
{"-32768.01234", -32768},
} {
d, err := NewFromString(testCase.Dec)
if err != nil {
t.Fatal(err)
}
if d.IntPart() != testCase.IntPart {
t.Errorf("expect %d, got %d", testCase.IntPart, d.IntPart())
}
}
}
func TestBigInt(t *testing.T) {
testCases := []struct {
Dec string
BigIntRep string
}{
{"0.0", "0"},
{"0.00000", "0"},
{"0.01", "0"},
{"12.1", "12"},
{"9999.999", "9999"},
{"-32768.01234", "-32768"},
{"-572372.0000000001", "-572372"},
}
for _, testCase := range testCases {
d, err := NewFromString(testCase.Dec)
if err != nil {
t.Fatal(err)
}
if d.BigInt().String() != testCase.BigIntRep {
t.Errorf("expect %s, got %s", testCase.BigIntRep, d.BigInt())
}
}
}
func TestBigFloat(t *testing.T) {
testCases := []struct {
Dec string
BigFloatRep string
}{
{"0.0", "0"},
{"0.00000", "0"},
{"0.01", "0.01"},
{"12.1", "12.1"},
{"9999.999", "9999.999"},
{"-32768.01234", "-32768.01234"},
{"-572372.0000000001", "-572372"},
{"512.012345123451234512345", "512.0123451"},
{"1.010101010101010101010101010101", "1.01010101"},
{"55555555.555555555555555555555", "55555555.56"},
}
for _, testCase := range testCases {
d, err := NewFromString(testCase.Dec)
if err != nil {
t.Fatal(err)
}
if d.BigFloat().String() != testCase.BigFloatRep {
t.Errorf("expect %s, got %s", testCase.BigFloatRep, d.BigFloat())
}
}
}
func TestDecimal_Min(t *testing.T) {
// the first element in the array is the expected answer, rest are inputs
testCases := [][]float64{
{0, 0},
{1, 1},
{-1, -1},
{1, 1, 2},
{-2, 1, 2, -2},
{-3, 0, 2, -2, -3},
}
for _, test := range testCases {
expected, input := test[0], test[1:]
expectedDecimal := NewFromFloat(expected)
decimalInput := []Decimal{}
for _, inp := range input {
d := NewFromFloat(inp)
decimalInput = append(decimalInput, d)
}
got := Min(decimalInput[0], decimalInput[1:]...)
if !got.Equal(expectedDecimal) {
t.Errorf("Expected %v, got %v, input=%+v", expectedDecimal, got,
decimalInput)
}
}
}
func TestDecimal_Max(t *testing.T) {
// the first element in the array is the expected answer, rest are inputs
testCases := [][]float64{
{0, 0},
{1, 1},
{-1, -1},
{2, 1, 2},
{2, 1, 2, -2},
{3, 0, 3, -2},
{-2, -3, -2},
}
for _, test := range testCases {
expected, input := test[0], test[1:]
expectedDecimal := NewFromFloat(expected)
decimalInput := []Decimal{}
for _, inp := range input {
d := NewFromFloat(inp)
decimalInput = append(decimalInput, d)
}
got := Max(decimalInput[0], decimalInput[1:]...)
if !got.Equal(expectedDecimal) {
t.Errorf("Expected %v, got %v, input=%+v", expectedDecimal, got,
decimalInput)
}
}
}
func scanHelper(t *testing.T, dbval interface{}, expected Decimal) {
t.Helper()
a := Decimal{}
if err := a.Scan(dbval); err != nil {
// Scan failed... no need to test result value
t.Errorf("a.Scan(%v) failed with message: %s", dbval, err)
} else if !a.Equal(expected) {
// Scan succeeded... test resulting values
t.Errorf("%s does not equal to %s", a, expected)
}
}
func TestDecimal_Scan(t *testing.T) {
// test the Scan method that implements the sql.Scanner interface
// check different types received from various database drivers
dbvalue := 54.33
expected := NewFromFloat(dbvalue)
scanHelper(t, dbvalue, expected)
// apparently MySQL 5.7.16 and returns these as float32 so we need
// to handle these as well
dbvalueFloat32 := float32(54.33)
expected = NewFromFloat(float64(dbvalueFloat32))
scanHelper(t, dbvalueFloat32, expected)
// at least SQLite returns an int64 when 0 is stored in the db
// and you specified a numeric format on the schema
dbvalueInt := int64(0)
expected = New(dbvalueInt, 0)
scanHelper(t, dbvalueInt, expected)
// also test uint64
dbvalueUint64 := uint64(2)
expected = New(2, 0)
scanHelper(t, dbvalueUint64, expected)
// in case you specified a varchar in your SQL schema,
// the database driver may return either []byte or string
valueStr := "535.666"
dbvalueStr := []byte(valueStr)
expected, err := NewFromString(valueStr)
if err != nil {
t.Fatal(err)
}
scanHelper(t, dbvalueStr, expected)
scanHelper(t, valueStr, expected)
type foo struct{}
a := Decimal{}
err = a.Scan(foo{})
if err == nil {
t.Errorf("a.Scan(Foo{}) should have thrown an error but did not")
}
}
func TestDecimal_Value(t *testing.T) {
// Make sure this does implement the database/sql's driver.Valuer interface
var d Decimal
if _, ok := interface{}(d).(driver.Valuer); !ok {
t.Error("Decimal does not implement driver.Valuer")
}
// check that normal case is handled appropriately
a := New(1234, -2)
expected := "12.34"
value, err := a.Value()
if err != nil {
t.Errorf("Decimal(12.34).Value() failed with message: %s", err)
} else if value.(string) != expected {
t.Errorf("%s does not equal to %s", a, expected)
}
}
// old tests after this line
func TestDecimal_Scale(t *testing.T) {
a := New(1234, -3)
if a.Exponent() != -3 {
t.Errorf("error")
}
}
func TestDecimal_Abs1(t *testing.T) {
a := New(-1234, -4)
b := New(1234, -4)
c := a.Abs()
if c.Cmp(b) != 0 {
t.Errorf("error")
}
}
func TestDecimal_Abs2(t *testing.T) {
a := New(-1234, -4)
b := New(1234, -4)
c := b.Abs()
if c.Cmp(a) == 0 {
t.Errorf("error")
}
}
func TestDecimal_Equalities(t *testing.T) {
a := New(1234, 3)
b := New(1234, 3)
c := New(1234, 4)
if !a.Equal(b) {
t.Errorf("%q should equal %q", a, b)
}
if a.Equal(c) {
t.Errorf("%q should not equal %q", a, c)
}
// note, this block should be deprecated, here for backwards compatibility
if !a.Equals(b) {
t.Errorf("%q should equal %q", a, b)
}
if !c.GreaterThan(b) {
t.Errorf("%q should be greater than %q", c, b)
}
if b.GreaterThan(c) {
t.Errorf("%q should not be greater than %q", b, c)
}
if !a.GreaterThanOrEqual(b) {
t.Errorf("%q should be greater or equal %q", a, b)
}
if !c.GreaterThanOrEqual(b) {
t.Errorf("%q should be greater or equal %q", c, b)
}
if b.GreaterThanOrEqual(c) {
t.Errorf("%q should not be greater or equal %q", b, c)
}
if !b.LessThan(c) {
t.Errorf("%q should be less than %q", a, b)
}
if c.LessThan(b) {
t.Errorf("%q should not be less than %q", a, b)
}
if !a.LessThanOrEqual(b) {
t.Errorf("%q should be less than or equal %q", a, b)
}
if !b.LessThanOrEqual(c) {
t.Errorf("%q should be less than or equal %q", a, b)
}
if c.LessThanOrEqual(b) {
t.Errorf("%q should not be less than or equal %q", a, b)
}
}
func TestDecimal_ScalesNotEqual(t *testing.T) {
a := New(1234, 2)
b := New(1234, 3)
if a.Equal(b) {
t.Errorf("%q should not equal %q", a, b)
}
}
func TestDecimal_Cmp1(t *testing.T) {
a := New(123, 3)
b := New(-1234, 2)
if a.Cmp(b) != 1 {
t.Errorf("Error")
}
}
func TestDecimal_Cmp2(t *testing.T) {
a := New(123, 3)
b := New(1234, 2)
if a.Cmp(b) != -1 {
t.Errorf("Error")
}
}
func TestDecimal_Pow(t *testing.T) {
for _, testCase := range []struct {
Base string
Exponent string
Expected string
}{
{"0.0", "1.0", "0.0"},
{"0.0", "5.7", "0.0"},
{"0.0", "-3.2", "0.0"},
{"3.13", "0.0", "1.0"},
{"-591.5", "0.0", "1.0"},
{"3.0", "3.0", "27.0"},
{"3.0", "10.0", "59049.0"},
{"3.13", "5.0", "300.4150512793"},
{"4.0", "2.0", "16.0"},
{"4.0", "-2.0", "0.0625"},
{"629.25", "5.0", "98654323103449.5673828125"},
{"5.0", "5.73", "10118.08037159375"},
{"962.0", "3.2791", "6055212360.0000044205714144"},
{"5.69169126", "5.18515912", "8242.26344757948412597909547972726268869189399260047793106028930864"},
{"13.1337", "3.5196719618391835", "8636.856220644773844815693636723928750940666269885"},
{"67762386.283696923", "4.85917691669163916681738", "112761146905370140621385730157437443321.91755738117317148674362233906499698561022574811238435007575701773212242750262081945556470501"},
{"-3.0", "6.0", "729"},
{"-13.757", "5.0", "-492740.983929899460557"},
{"3.0", "-6.0", "0.0013717421124829"},
{"13.757", "-5.0", "0.000002029463821"},
{"66.12", "-7.61313", "0.000000000000013854086588876805036"},
{"6696871.12", "-2.61313", "0.000000000000000001455988684546983"},
{"-3.0", "-6.0", "0.0013717421124829"},
{"-13.757", "-5.0", "-0.000002029463821"},
} {
base, _ := NewFromString(testCase.Base)
exp, _ := NewFromString(testCase.Exponent)
expected, _ := NewFromString(testCase.Expected)
result := base.Pow(exp)
if result.Cmp(expected) != 0 {
t.Errorf("expected %s, got %s, for %s^%s", testCase.Expected, result.String(), testCase.Base, testCase.Exponent)
}
}
}
func TestDecimal_PowWithPrecision(t *testing.T) {
for _, testCase := range []struct {
Base string
Exponent string
Precision int32
Expected string
}{
{"0.0", "1.0", 2, "0.0"},
{"0.0", "5.7", 2, "0.0"},
{"0.0", "-3.2", 2, "0.0"},
{"3.13", "0.0", 2, "1.0"},
{"-591.5", "0.0", 2, "1.0"},
{"3.0", "3.0", 2, "27.0"},
{"3.0", "10.0", 2, "59049.0"},
{"3.13", "5.0", 5, "300.4150512793"},
{"4.0", "2.0", 2, "16.0"},
{"4.0", "-2.0", 2, "0.06"},
{"4.0", "-2.0", 4, "0.0625"},
{"629.25", "5.0", 6, "98654323103449.5673828125"},
{"5.0", "5.73", 20, "10118.080371595019317118681359884375"},
{"962.0", "3.2791", 15, "6055212360.000004406551603058195732"},
{"5.69169126", "5.18515912", 4, "8242.26344757948412587366859330429895955552280978668983459852256"},
{"13.1337", "3.5196719618391835", 8, "8636.85622064477384481569363672392591908386390769375"},
{"67762386.283696923", "4.85917691669163916681738", 10, "112761146905370140621385730157437443321.917557381173174638304347353880676293576708009282115993465286373470882947470198597518762"},
{"-3.0", "6.0", 2, "729"},
{"-13.757", "5.0", 4, "-492740.983929899460557"},
{"3.0", "-6.0", 10, "0.0013717421"},
{"13.757", "-5.0", 20, "0.00000202946382098037"},
{"66.12", "-7.61313", 20, "0.00000000000001385381563049821591633907104023700216"},
{"6696871.12", "-2.61313", 24, "0.0000000000000000014558252733872790626400278983397459207418"},
{"-3.0", "-6.0", 8, "0.00137174"},
{"-13.757", "-5.0", 16, "-0.000002029463821"},
} {
base, _ := NewFromString(testCase.Base)
exp, _ := NewFromString(testCase.Exponent)
expected, _ := NewFromString(testCase.Expected)
result, _ := base.PowWithPrecision(exp, testCase.Precision)
if result.Cmp(expected) != 0 {
t.Errorf("expected %s, got %s, for %s^%s", testCase.Expected, result.String(), testCase.Base, testCase.Exponent)
}
}
}
func TestDecimal_PowWithPrecision_Infinity(t *testing.T) {
for _, testCase := range []struct {
Base string
Exponent string
}{
{"0.0", "0.0"},
{"0.0", "-2.0"},
{"0.0", "-4.6"},
{"-66.12", "7.61313"}, // Imaginary value
{"-5696871.12", "5.61313"}, // Imaginary value
} {
base, _ := NewFromString(testCase.Base)
exp, _ := NewFromString(testCase.Exponent)
_, err := base.PowWithPrecision(exp, 5)
if err == nil {
t.Errorf("lool it should be error")
}
}
}
func TestDecimal_PowWithPrecision_UndefinedResult(t *testing.T) {
base := RequireFromString("0")
exponent := RequireFromString("0")
_, err := base.PowWithPrecision(exponent, 4)
if err == nil {
t.Errorf("expected error, cannot be represent undefined value of 0**0")
}
}
func TestDecimal_PowWithPrecision_InfinityResult(t *testing.T) {
for _, testCase := range []struct {
Base string
Exponent string
}{
{"0.0", "-2.0"},
{"0.0", "-4.6"},
{"0.0", "-9239.671333"},
} {
base, _ := NewFromString(testCase.Base)
exp, _ := NewFromString(testCase.Exponent)
_, err := base.PowWithPrecision(exp, 4)
if err == nil {
t.Errorf("expected error, cannot represent infinity value of 0 ** y, where y < 0")
}
}
}
func TestDecimal_PowWithPrecision_ImaginaryResult(t *testing.T) {
for _, testCase := range []struct {
Base string
Exponent string
}{
{"-0.2261", "106.12"},
{"-66.12", "7.61313"},
{"-5696871.12", "5.61313"},
} {
base, _ := NewFromString(testCase.Base)
exp, _ := NewFromString(testCase.Exponent)
_, err := base.PowWithPrecision(exp, 4)
if err == nil {
t.Errorf("expected error, cannot represent imaginary value of x ** y, where x < 0 and y is non-integer decimal")
}
}
}
func TestDecimal_PowInt32(t *testing.T) {
for _, testCase := range []struct {
Decimal string
Exponent int32
Expected string
}{
{"0.0", 1, "0.0"},
{"3.13", 0, "1.0"},
{"-591.5", 0, "1.0"},
{"3.0", 3, "27.0"},
{"3.0", 10, "59049.0"},
{"3.13", 5, "300.4150512793"},
{"629.25", 5, "98654323103449.5673828125"},
{"-3.0", 6, "729"},
{"-13.757", 5, "-492740.983929899460557"},
{"3.0", -6, "0.0013717421124829"},
{"-13.757", -5, "-0.000002029463821"},
} {
base, _ := NewFromString(testCase.Decimal)
expected, _ := NewFromString(testCase.Expected)
result, _ := base.PowInt32(testCase.Exponent)
if result.Cmp(expected) != 0 {
t.Errorf("expected %s, got %s, for %s**%d", testCase.Expected, result.String(), testCase.Decimal, testCase.Exponent)
}
}
}
func TestDecimal_PowInt32_UndefinedResult(t *testing.T) {
base := RequireFromString("0")
_, err := base.PowInt32(0)
if err == nil {
t.Errorf("expected error, cannot be represent undefined value of 0**0")
}
}
func TestDecimal_PowBigInt(t *testing.T) {
for _, testCase := range []struct {
Decimal string
Exponent *big.Int
Expected string
}{
{"3.13", big.NewInt(0), "1.0"},
{"-591.5", big.NewInt(0), "1.0"},
{"3.0", big.NewInt(3), "27.0"},
{"3.0", big.NewInt(10), "59049.0"},
{"3.13", big.NewInt(5), "300.4150512793"},
{"629.25", big.NewInt(5), "98654323103449.5673828125"},
{"-3.0", big.NewInt(6), "729"},
{"-13.757", big.NewInt(5), "-492740.983929899460557"},
{"3.0", big.NewInt(-6), "0.0013717421124829"},
{"-13.757", big.NewInt(-5), "-0.000002029463821"},
} {
base, _ := NewFromString(testCase.Decimal)
expected, _ := NewFromString(testCase.Expected)
result, _ := base.PowBigInt(testCase.Exponent)
if result.Cmp(expected) != 0 {
t.Errorf("expected %s, got %s, for %s**%d", testCase.Expected, result.String(), testCase.Decimal, testCase.Exponent)
}
}
}
func TestDecimal_PowBigInt_UndefinedResult(t *testing.T) {
base := RequireFromString("0")
_, err := base.PowBigInt(big.NewInt(0))
if err == nil {
t.Errorf("expected error, undefined value of 0**0 cannot be represented")
}
}
func TestDecimal_IsInteger(t *testing.T) {
for _, testCase := range []struct {
Dec string
IsInteger bool
}{
{"0", true},
{"0.0000", true},
{"0.01", false},
{"0.01010101010000", false},
{"12.0", true},
{"12.00000000000000", true},
{"12.10000", false},
{"9999.0000", true},
{"99999999.000000000", true},
{"-656323444.0000000000000", true},
{"-32768.01234", false},
{"-32768.0123423562623600000", false},
} {
d, err := NewFromString(testCase.Dec)
if err != nil {
t.Fatal(err)
}
if d.IsInteger() != testCase.IsInteger {
t.Errorf("expect %t, got %t, for %s", testCase.IsInteger, d.IsInteger(), testCase.Dec)
}
}
}
func TestDecimal_ExpHullAbrham(t *testing.T) {
for _, testCase := range []struct {
Dec string
OverallPrecision uint32
ExpectedDec string
}{
{"0", 1, "1"},
{"0.00", 5, "1"},
{"0.5", 5, "1.6487"},
{"0.569297", 10, "1.767024397"},
{"0.569297", 16, "1.76702439654095"},
{"0.569297", 20, "1.7670243965409496521"},
{"1.0", 0, "3"},
{"1.0", 1, "3"},
{"1.0", 5, "2.7183"},
{"1.0", 10, "2.718281828"},
{"3.0", 0, "20"},
{"3.0", 2, "20"},
{"5.26", 0, "200"},
{"5.26", 2, "190"},
{"5.26", 10, "192.4814913"},
{"5.2663117716", 2, "190"},
{"5.2663117716", 10, "193.7002327"},
{"26.1", 2, "220000000000"},
{"26.1", 10, "216314672100"},
{"26.1", 20, "216314672147.05767284"},
{"50.1591", 10, "6078834887000000000000"},
{"50.1591", 30, "6078834886623434464595.07937141"},
{"-0.5", 5, "0.60653"},
{"-0.569297", 10, "0.5659231429"},
{"-0.569297", 16, "0.565923142859576"},
{"-0.569297", 20, "0.56592314285957604443"},
{"-1.0", 1, "0.4"},
{"-1.0", 5, "0.36788"},
{"-3.0", 1, "0"},
{"-3.0", 2, "0.05"},
{"-3.0", 10, "0.0497870684"},
{"-5.26", 2, "0.01"},
{"-5.26", 10, "0.0051953047"},
{"-5.2663117716", 2, "0.01"},
{"-5.2663117716", 10, "0.0051626164"},
{"-26.1", 2, "0"},
{"-26.1", 15, "0.000000000004623"},
{"-50.1591", 10, "0"},
{"-50.1591", 30, "0.000000000000000000000164505208"},
} {
d, _ := NewFromString(testCase.Dec)
expected, _ := NewFromString(testCase.ExpectedDec)
exp, err := d.ExpHullAbrham(testCase.OverallPrecision)
if err != nil {
t.Fatal(err)
}
if exp.Cmp(expected) != 0 {
t.Errorf("expected %s, got %s, for decimal %s", testCase.ExpectedDec, exp.String(), testCase.Dec)
}
}
}
func TestDecimal_ExpTaylor(t *testing.T) {
for _, testCase := range []struct {
Dec string
Precision int32
ExpectedDec string
}{
{"0", 1, "1"},
{"0.00", 5, "1"},
{"0", -1, "0"},
{"0.5", 5, "1.64872"},
{"0.569297", 10, "1.7670243965"},
{"0.569297", 16, "1.7670243965409497"},
{"0.569297", 20, "1.76702439654094965215"},
{"1.0", 0, "3"},
{"1.0", 1, "2.7"},
{"1.0", 5, "2.71828"},
{"1.0", -1, "0"},
{"1.0", -5, "0"},
{"3.0", 1, "20.1"},
{"3.0", 2, "20.09"},
{"5.26", 0, "192"},
{"5.26", 2, "192.48"},
{"5.26", 10, "192.4814912972"},
{"5.26", -2, "200"},
{"5.2663117716", 2, "193.70"},
{"5.2663117716", 10, "193.7002326701"},
{"26.1", 2, "216314672147.06"},
{"26.1", 20, "216314672147.05767284062928674083"},
{"26.1", -2, "216314672100"},
{"26.1", -10, "220000000000"},
{"50.1591", 10, "6078834886623434464595.0793714061"},
{"-0.5", 5, "0.60653"},
{"-0.569297", 10, "0.5659231429"},
{"-0.569297", 16, "0.565923142859576"},
{"-0.569297", 20, "0.56592314285957604443"},
{"-1.0", 1, "0.4"},
{"-1.0", 5, "0.36788"},
{"-1.0", -1, "0"},
{"-1.0", -5, "0"},
{"-3.0", 1, "0.1"},
{"-3.0", 2, "0.05"},
{"-3.0", 10, "0.0497870684"},
{"-5.26", 2, "0.01"},
{"-5.26", 10, "0.0051953047"},
{"-5.26", -2, "0"},
{"-5.2663117716", 2, "0.01"},
{"-5.2663117716", 10, "0.0051626164"},
{"-26.1", 2, "0"},
{"-26.1", 15, "0.000000000004623"},
{"-26.1", -2, "0"},
{"-26.1", -10, "0"},
{"-50.1591", 10, "0"},
{"-50.1591", 30, "0.000000000000000000000164505208"},
} {
d, _ := NewFromString(testCase.Dec)
expected, _ := NewFromString(testCase.ExpectedDec)
exp, err := d.ExpTaylor(testCase.Precision)
if err != nil {
t.Fatal(err)
}
if exp.Cmp(expected) != 0 {
t.Errorf("expected %s, got %s", testCase.ExpectedDec, exp.String())
}
}
}
func TestDecimal_Ln(t *testing.T) {
for _, testCase := range []struct {
Dec string
Precision int32
Expected string
}{
{"0.1", 25, "-2.3025850929940456840179915"},
{"0.01", 25, "-4.6051701859880913680359829"},
{"0.001", 25, "-6.9077552789821370520539744"},
{"0.00000001", 25, "-18.4206807439523654721439316"},
{"1.0", 10, "0.0"},
{"1.01", 25, "0.0099503308531680828482154"},
{"1.001", 25, "0.0009995003330835331668094"},
{"1.0001", 25, "0.0000999950003333083353332"},
{"1.1", 25, "0.0953101798043248600439521"},
{"1.13", 25, "0.1222176327242492005461486"},
{"3.13", 10, "1.1410330046"},
{"3.13", 25, "1.1410330045520618486427824"},
{"3.13", 50, "1.14103300455206184864278239988848193837089629107972"},
{"3.13", 100, "1.1410330045520618486427823998884819383708962910797239760817078430268177216960996098918971117211892839"},
{"5.71", 25, "1.7422190236679188486939833"},
{"5.7185108151957193571930205", 50, "1.74370842450178929149992165925283704012576949094645"},
{"839101.0351", 25, "13.6400864014410013994397240"},
{"839101.0351094726488848490572028502", 50, "13.64008640145229044389152437468283605382056561604272"},
{"5023583755703750094849.03519358513093500275017501750602739169823", 25, "49.9684305274348922267409953"},
{"5023583755703750094849.03519358513093500275017501750602739169823", -1, "50.0"},
{"66.12", 18, "4.191471272952823429"},
} {
d, _ := NewFromString(testCase.Dec)
expected, _ := NewFromString(testCase.Expected)
ln, err := d.Ln(testCase.Precision)
if err != nil {
t.Fatal(err)
}
if ln.Cmp(expected) != 0 {
t.Errorf("expected %s, got %s, for decimal %s", testCase.Expected, ln.String(), testCase.Dec)
}
}
}
func TestDecimal_LnZero(t *testing.T) {
d := New(0, 0)
_, err := d.Ln(5)
if err == nil {
t.Errorf("expected error, natural logarithm of 0 cannot be represented (-infinity)")
}
}
func TestDecimal_LnNegative(t *testing.T) {
d := New(-20, 2)
_, err := d.Ln(5)
if err == nil {
t.Errorf("expected error, natural logarithm cannot be calculated for nagative decimals")
}
}
func TestDecimal_NumDigits(t *testing.T) {
for _, testCase := range []struct {
Dec string
ExpectedNumDigits int
}{
{"0", 1},
{"0.00", 1},
{"1.0", 2},
{"3.0", 2},
{"5.26", 3},
{"5.2663117716", 11},
{"3164836416948884.2162426426426267863", 35},
{"26.1", 3},
{"529.1591", 7},
{"-1.0", 2},
{"-3.0", 2},
{"-5.26", 3},
{"-5.2663117716", 11},
{"-26.1", 3},
{"", 1},
} {
d, _ := NewFromString(testCase.Dec)
nums := d.NumDigits()
if nums != testCase.ExpectedNumDigits {
t.Errorf("expected %d digits for decimal %s, got %d", testCase.ExpectedNumDigits, testCase.Dec, nums)
}
}
}
func TestDecimal_Sign(t *testing.T) {
if Zero.Sign() != 0 {
t.Errorf("%q should have sign 0", Zero)
}
one := New(1, 0)
if one.Sign() != 1 {
t.Errorf("%q should have sign 1", one)
}
mone := New(-1, 0)
if mone.Sign() != -1 {
t.Errorf("%q should have sign -1", mone)
}
}
func didPanic(f func()) bool {
ret := false
func() {
defer func() {
if message := recover(); message != nil {
ret = true
}
}()
// call the target function
f()
}()
return ret
}
func TestDecimal_Coefficient(t *testing.T) {
d := New(123, 0)
co := d.Coefficient()
if co.Int64() != 123 {
t.Error("Coefficient should be 123; Got:", co)
}
co.Set(big.NewInt(0))
if d.IntPart() != 123 {
t.Error("Modifying coefficient modified Decimal; Got:", d)
}
}
func TestDecimal_CoefficientInt64(t *testing.T) {
type Inp struct {
Dec string
Coefficient int64
}
testCases := []Inp{
{"1", 1},
{"1.111", 1111},
{"1.000000", 1000000},
{"1.121215125511", 1121215125511},
{"100000000000000000", 100000000000000000},
{"9223372036854775807", 9223372036854775807},
{"10000000000000000000", -8446744073709551616}, // undefined value
}
// add negative cases
for _, tc := range testCases {
testCases = append(testCases, Inp{"-" + tc.Dec, -tc.Coefficient})
}
for _, tc := range testCases {
d := RequireFromString(tc.Dec)
coefficient := d.CoefficientInt64()
if coefficient != tc.Coefficient {
t.Errorf("expect coefficient %d, got %d, for decimal %s", tc.Coefficient, coefficient, tc.Dec)
}
}
}
func TestNullDecimal_Scan(t *testing.T) {
// test the Scan method that implements the
// sql.Scanner interface
// check for the for different type of values
// that are possible to be received from the database
// drivers
// in normal operations the db driver (sqlite at least)
// will return an int64 if you specified a numeric format
// Make sure handles nil values
a := NullDecimal{}
var dbvaluePtr interface{}
err := a.Scan(dbvaluePtr)
if err != nil {
// Scan failed... no need to test result value
t.Errorf("a.Scan(nil) failed with message: %s", err)
} else {
if a.Valid {
t.Errorf("%s is not null", a.Decimal)
}
}
dbvalue := 54.33
expected := NewFromFloat(dbvalue)
err = a.Scan(dbvalue)
if err != nil {
// Scan failed... no need to test result value
t.Errorf("a.Scan(54.33) failed with message: %s", err)
} else {
// Scan succeeded... test resulting values
if !a.Valid {
t.Errorf("%s is null", a.Decimal)
} else if !a.Decimal.Equals(expected) {
t.Errorf("%s does not equal to %s", a.Decimal, expected)
}
}
// at least SQLite returns an int64 when 0 is stored in the db
// and you specified a numeric format on the schema
dbvalueInt := int64(0)
expected = New(dbvalueInt, 0)
err = a.Scan(dbvalueInt)
if err != nil {
// Scan failed... no need to test result value
t.Errorf("a.Scan(0) failed with message: %s", err)
} else {
// Scan succeeded... test resulting values
if !a.Valid {
t.Errorf("%s is null", a.Decimal)
} else if !a.Decimal.Equals(expected) {
t.Errorf("%v does not equal %v", a, expected)
}
}
// in case you specified a varchar in your SQL schema,
// the database driver will return byte slice []byte
valueStr := "535.666"
dbvalueStr := []byte(valueStr)
expected, err = NewFromString(valueStr)
if err != nil {
t.Fatal(err)
}
err = a.Scan(dbvalueStr)
if err != nil {
// Scan failed... no need to test result value
t.Errorf("a.Scan('535.666') failed with message: %s", err)
} else {
// Scan succeeded... test resulting values
if !a.Valid {
t.Errorf("%s is null", a.Decimal)
} else if !a.Decimal.Equals(expected) {
t.Errorf("%v does not equal %v", a, expected)
}
}
// lib/pq can also return strings
expected, err = NewFromString(valueStr)
if err != nil {
t.Fatal(err)
}
err = a.Scan(valueStr)
if err != nil {
// Scan failed... no need to test result value
t.Errorf("a.Scan('535.666') failed with message: %s", err)
} else {
// Scan succeeded... test resulting values
if !a.Valid {
t.Errorf("%s is null", a.Decimal)
} else if !a.Decimal.Equals(expected) {
t.Errorf("%v does not equal %v", a, expected)
}
}
}
func TestNullDecimal_Value(t *testing.T) {
// Make sure this does implement the database/sql's driver.Valuer interface
var nullDecimal NullDecimal
if _, ok := interface{}(nullDecimal).(driver.Valuer); !ok {
t.Error("NullDecimal does not implement driver.Valuer")
}
// check that null is handled appropriately
value, err := nullDecimal.Value()
if err != nil {
t.Errorf("NullDecimal{}.Valid() failed with message: %s", err)
} else if value != nil {
t.Errorf("%v is not nil", value)
}
// check that normal case is handled appropriately
a := NullDecimal{Decimal: New(1234, -2), Valid: true}
expected := "12.34"
value, err = a.Value()
if err != nil {
t.Errorf("NullDecimal(12.34).Value() failed with message: %s", err)
} else if value.(string) != expected {
t.Errorf("%v does not equal %v", a, expected)
}
}
func TestBinary(t *testing.T) {
for _, y := range testTable {
x := y.float
// Create the decimal
d1 := NewFromFloat(x)
// Encode to binary
b, err := d1.MarshalBinary()
if err != nil {
t.Errorf("error marshalling %v to binary: %v", d1, err)
}
// Restore from binary
var d2 Decimal
err = (&d2).UnmarshalBinary(b)
if err != nil {
t.Errorf("error unmarshalling from binary: %v", err)
}
// The restored decimal should equal the original
if !d1.Equals(d2) {
t.Errorf("expected %v when restoring, got %v", d1, d2)
}
}
}
func TestBinary_Zero(t *testing.T) {
var d1 Decimal
b, err := d1.MarshalBinary()
if err != nil {
t.Fatalf("error marshalling %v to binary: %v", d1, err)
}
var d2 Decimal
err = (&d2).UnmarshalBinary(b)
if err != nil {
t.Errorf("error unmarshalling from binary: %v", err)
}
if !d1.Equals(d2) {
t.Errorf("expected %v when restoring, got %v", d1, d2)
}
}
func TestBinary_DataTooShort(t *testing.T) {
var d Decimal
err := d.UnmarshalBinary(nil) // nil slice has length 0
if err == nil {
t.Fatalf("expected error, got %v", d)
}
}
func TestBinary_InvalidValue(t *testing.T) {
var d Decimal
err := d.UnmarshalBinary([]byte{0, 0, 0, 0, 'x'}) // valid exponent, invalid value
if err == nil {
t.Fatalf("expected error, got %v", d)
}
}
func slicesEqual(a, b []byte) bool {
for i, val := range a {
if b[i] != val {
return false
}
}
return true
}
func TestGobEncode(t *testing.T) {
for _, y := range testTable {
x := y.float
d1 := NewFromFloat(x)
b1, err := d1.GobEncode()
if err != nil {
t.Errorf("error encoding %v to binary: %v", d1, err)
}
d2 := NewFromFloat(x)
b2, err := d2.GobEncode()
if err != nil {
t.Errorf("error encoding %v to binary: %v", d2, err)
}
if !slicesEqual(b1, b2) {
t.Errorf("something about the gobencode is not working properly \n%v\n%v", b1, b2)
}
var d3 Decimal
err = d3.GobDecode(b1)
if err != nil {
t.Errorf("Error gobdecoding %v, got %v", b1, d3)
}
var d4 Decimal
err = d4.GobDecode(b2)
if err != nil {
t.Errorf("Error gobdecoding %v, got %v", b2, d4)
}
eq := d3.Equal(d4)
if eq != true {
t.Errorf("Encoding then decoding mutated Decimal")
}
eq = d1.Equal(d3)
if eq != true {
t.Errorf("Error gobencoding/decoding %v, got %v", d1, d3)
}
}
}
func TestSum(t *testing.T) {
vals := make([]Decimal, 10)
var i = int64(0)
for key := range vals {
vals[key] = New(i, 0)
i++
}
sum := Sum(vals[0], vals[1:]...)
if !sum.Equal(New(45, 0)) {
t.Errorf("Failed to calculate sum, expected %s got %s", New(45, 0), sum)
}
}
func TestAvg(t *testing.T) {
vals := make([]Decimal, 10)
var i = int64(0)
for key := range vals {
vals[key] = New(i, 0)
i++
}
avg := Avg(vals[0], vals[1:]...)
if !avg.Equal(NewFromFloat(4.5)) {
t.Errorf("Failed to calculate average, expected %s got %s", NewFromFloat(4.5).String(), avg.String())
}
}
func TestRoundBankAnomaly(t *testing.T) {
a := New(25, -1)
b := New(250, -2)
if !a.Equal(b) {
t.Errorf("Expected %s to equal %s", a, b)
}
expected := New(2, 0)
aRounded := a.RoundBank(0)
if !aRounded.Equal(expected) {
t.Errorf("Expected bank rounding %s to equal %s, but it was %s", a, expected, aRounded)
}
bRounded := b.RoundBank(0)
if !bRounded.Equal(expected) {
t.Errorf("Expected bank rounding %s to equal %s, but it was %s", b, expected, bRounded)
}
}
// Trig tests
// For Atan
func TestAtan(t *testing.T) {
inps := []string{
"-2.91919191919191919",
"-1.0",
"-0.25",
"0.0",
"0.33",
"1.0",
"5.0",
"10",
"11000020.2407442310156021090304691671842603586882014729198302312846062338790031898128063403419218957424",
}
sols := []string{
"-1.24076438822058001027437062753106",
"-0.78539816339744833061616997868383",
"-0.24497866312686415",
"0.0",
"0.318747560420644443",
"0.78539816339744833061616997868383",
"1.37340076694501580123233995736766",
"1.47112767430373453123233995736766",
"1.57079623588597296123259450235374",
}
for i, inp := range inps {
d, err := NewFromString(inp)
if err != nil {
t.FailNow()
}
s, err := NewFromString(sols[i])
if err != nil {
t.FailNow()
}
a := d.Atan()
if !a.Equal(s) {
t.Errorf("expected %s, got %s", s, a)
}
}
}
// For Sin
func TestSin(t *testing.T) {
inps := []string{
"-2.91919191919191919",
"-1.0",
"-0.25",
"0.0",
"0.33",
"1.0",
"5.0",
"10",
"11000020.2407442310156021090304691671842603586882014729198302312846062338790031898128063403419218957424",
}
sols := []string{"-0.22057186252002995641471297726318877448242875710373383657841216606788849153474483300147427943530288911869356126149550184271061369789963810497434594683859566879253561990821788142048867910104964466745284318577343435957806286762494529983369776697504436326725441516925396488258485248699247367113416543705253919473126183478178486954138205996912770183192357029798618739277146694040778731661407420114923656224752540889120768",
"-0.841470984807896544828551915928318375739843472469519282898610111931110319333748010828751784005573402229699531838022117989945539661588502120624574802425114599802714611508860519655182175315926637327774878594985045816542706701485174683683726979309922117859910272413672784175028365607893544855897795184024100973080880074046886009375162838756876336134083638363801171409953672944184918309063800980214873465660723218405962257950683415203634506166523593278",
"-0.2474039592545229296662577977006816864013671875",
"0",
"0.3240430283948683457891331120415701894104386268737728",
"0.841470984807896544828551915928318375739843472469519282898610111931110319333748010828751784005573402229699531838022117989945539661588502120624574802425114599802714611508860519655182175315926637327774878594985045816542706701485174683683726979309922117859910272413672784175028365607893544855897795184024100973080880074046886009375162838756876336134083638363801171409953672944184918309063800980214873465660723218405962257950683415203634506166523593278",
"-0.958924274663138409032065951037351417114444405831206421994322505831797734568720303321152847999323782235893449831846516332891972309733806145798957570823292783131379570446989311599459252931842975162373777189193072018951049969744350662993214861042908755303566670204873618202680865638534865944483058650517380292320436016362659617294570185140789829574277032406195741535138712427510938542219940873171248862329526140744770994303733112530324791184417282382",
"-0.54402111088937016772477554483765124109312606762621462357463994520238396180161585438877562935656067241573063207614488370477645194661241525080677431257416988398683714890165970942834453391033857378247849486306346743023618509617104937236345831462093934032592562972419977883837745736210439651143668255744843041350221801750331646628192115694352540293150183983357476391787825596543270240461102629075832777618592034309799936",
"-0.564291758480422881634770440632390475980828840253516895637281099241819037882007239070203007530085741820184955492382572029153491807930868879341091067301689987699567034024159005627332722089169680203292567574310010066799858914647295684974242359142300929248173166551428537696685165964880390889406578530338963341989826231514301546476672476399906348023294571001061677668735117509440368611093448917120819545826797975989350435900286332895885871219875665471968941335407351099209738417818747252638912592184093301853338763294381446907254104878969784040526201729163408095795934201105630182851806342356035203279670146684553491616847294749721014579109870396804713831114709372638323643327823671187472335866664108658093206409882794958673673978956925250261545083579947618620746006004554405785185537391110314728988164693223775249484198058394348289545771967707968288542718255197272633789792059019367104377340604030147471453833808674013259696102003732963091159662478879760121731138091114134586544668859915547568540172541576138084166990547345181184322550297604278946942918844039406876827936831612756344331500301118652183156052728447906384772901595431751550607818380262138322673253023464533931883787069611052589166000316238423939491520880451263927981787175602294299295744",
}
for i, inp := range inps {
d, err := NewFromString(inp)
if err != nil {
t.FailNow()
}
s, err := NewFromString(sols[i])
if err != nil {
t.FailNow()
}
a := d.Sin()
if !a.Equal(s) {
t.Errorf("expected %s, got %s", s, a)
}
}
}
// For Cos
func TestCos(t *testing.T) {
inps := []string{
"-2.91919191919191919",
"-1.0",
"-0.25",
"0.0",
"0.33",
"1.0",
"5.0",
"10",
"11000020.2407442310156021090304691671842603586882014729198302312846062338790031898128063403419218957424",
}
sols := []string{
"-0.975370726167463467746508538219884948528729295145689640359666742268127382748782064668565276308334226452812521220478854320025773591423493734486361306323829818426063430805234608660356853863442937297855742231573288105774823103008774355455799906250461848079705023428527473474556899228935370709945979509634251305018978306493011197513482210179171510947538040406781879762352211326273272515279567525396877609653501706919545667682725671944948392322552266752",
"0.54030230586813965874561515067176071767603141150991567490927772778673118786033739102174242337864109186439207498973007363884202112942385976796862442063752663646870430360736682397798633852405003167527051283327366631405990604840629657123985368031838052877290142895506386796217551784101265975360960112885444847880134909594560331781699767647860744559228420471946006511861233129745921297270844542687374552066388998112901504",
"0.968912421710644784099084544806854121387004852294921875",
"1",
"0.9460423435283869715490383692051286742343482760977712222",
"0.54030230586813965874561515067176071767603141150991567490927772778673118786033739102174242337864109186439207498973007363884202112942385976796862442063752663646870430360736682397798633852405003167527051283327366631405990604840629657123985368031838052877290142895506386796217551784101265975360960112885444847880134909594560331781699767647860744559228420471946006511861233129745921297270844542687374552066388998112901504",
"0.28366218546322646623291670213892426815646045792775066552057877370468842342090306560693620285882975471913545189522117672866861003904575909174769890684057564495184019705963607555427518763375472432216131070235796577209064861003009894615394882021220247535890708789312783718414424224334988974848162884228012265684775651099758365989567444515619764427493598258393280941942356912304265535918025036942025858493361644535438208",
"-0.839071529076452222947082170022504835457755803801719612447629165523199043803440231769716865070163209041973184176293170330332317060558438085478980463542480791358920580076809381102480339018809694514100495572097422057215638383077242523713704127605770444906854175870243452753002238589530499630034663296166308443155999957196346563161387705205277189957388653461251461388391745795979375660087266037741360406956289962327970672363315696841378765492754546688",
"-0.82557544253149396284458404188071504476091346830440347376462206521981928020803354950315062147200396866217255527509254080721982393941347365824137698491042935894213870423296625749297033966815252917361266452901192457318047750698424190124169875103436588397415032138037063155981648677895645409699825582226442363080800781881653440538927704569142007751338851079530521979429507520541625303794665680584709171813053216867014700596866196844144286737568957809383224972108999354839705480223052622003994027222120126949093911643497423100187973906980635670000034664323357488815820848035808846624518774608931622703631130673844138378087837990739103263093532314835289302930152150130664948083902949999427848344301686172490282395687167681679607401220592559832932068966455384902377056623736013617949634746332323529256184776892339963173795176200590119077305668901887229709592836744082027738666294887303249770621722032438202753270710379312736193201366287952361100525126056993039858894987153270630277483613793395809214871734783742285495171911648254647287555645360520115341268930844095156502348405343740866836850201634640011708462641462047870611041595707018966032206807675586825362640000739202116391403514629284000986232673698892843586989003952425039512325844566790376383098534975022847888104706525937115931692008959513984157709954859352131323440787667052399474107219968",
}
for i, inp := range inps {
d, err := NewFromString(inp)
if err != nil {
t.FailNow()
}
s, err := NewFromString(sols[i])
if err != nil {
t.FailNow()
}
a := d.Cos()
if !a.Equal(s) {
t.Errorf("expected %s, got %s", s, a)
}
}
}
// For Tan
func TestTan(t *testing.T) {
inps := []string{
"-2.91919191919191919",
"-1.0",
"-0.25",
"0.0",
"0.33",
"1.0",
"5.0",
"10",
"11000020.2407442310156021090304691671842603586882014729198302312846062338790031898128063403419218957424",
}
sols := []string{
"0.2261415650505790298980791606748881031998682652",
"-1.5574077246549025",
"-0.255341921221036275",
"0.0",
"0.342524867530038963",
"1.5574077246549025",
"-3.3805150062465829",
"0.6483608274590872485524085572681343280321117494",
"0.68351325561491170753499935023939368502774607234006019034769919811202010905597996164029250820702097041244539696",
}
for i, inp := range inps {
d, err := NewFromString(inp)
if err != nil {
t.FailNow()
}
s, err := NewFromString(sols[i])
if err != nil {
t.FailNow()
}
a := d.Tan()
if !a.Equal(s) {
t.Errorf("expected %s, got %s", s, a)
}
}
}
func TestNewNullDecimal(t *testing.T) {
d := NewFromInt(1)
nd := NewNullDecimal(d)
if !nd.Valid {
t.Errorf("expected NullDecimal to be valid")
}
if nd.Decimal != d {
t.Errorf("expected NullDecimal to hold the provided Decimal")
}
}
func ExampleNewFromFloat32() {
fmt.Println(NewFromFloat32(123.123123123123).String())
fmt.Println(NewFromFloat32(.123123123123123).String())
fmt.Println(NewFromFloat32(-1e13).String())
// OUTPUT:
//123.12312
//0.123123124
//-10000000000000
}
func ExampleNewFromFloat() {
fmt.Println(NewFromFloat(123.123123123123).String())
fmt.Println(NewFromFloat(.123123123123123).String())
fmt.Println(NewFromFloat(-1e13).String())
// OUTPUT:
//123.123123123123
//0.123123123123123
//-10000000000000
}
func TestDecimal_RoundHalfUp(t *testing.T) {
tests := []struct {
name string
d Decimal
places int32
want Decimal
}{
{
name: "550",
d: NewFromInt(550),
places: -2,
want: NewFromInt(600),
},
{
name: "545",
d: NewFromInt(545),
places: -2,
want: NewFromInt(500),
},
{
name: "500",
d: NewFromInt(500),
places: -2,
want: NewFromInt(500),
},
{
name: "1.1001",
d: NewFromFloat(1.1001),
places: 2,
want: NewFromFloat(1.10),
},
{
name: "-1.454",
d: NewFromFloat(-1.454),
places: 1,
want: NewFromFloat(-1.4),
},
{
name: "-1.464",
d: NewFromFloat(-1.464),
places: 1,
want: NewFromFloat(-1.5),
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
if got := tt.d.RoundHalfUp(tt.places); !got.Equal(tt.want) {
t.Errorf("RoundHalfUp() = %v, want %v", got, tt.want)
}
})
}
}
func TestDecimal_RoundHalfDown(t *testing.T) {
tests := []struct {
name string
d Decimal
places int32
want Decimal
}{
{
name: "550",
d: NewFromInt(550),
places: -2,
want: NewFromInt(500),
},
{
name: "560",
d: NewFromInt(560),
places: -2,
want: NewFromInt(600),
},
{
name: "500",
d: NewFromInt(500),
places: -2,
want: NewFromInt(500),
},
{
name: "1.1001",
d: NewFromFloat(1.1001),
places: 2,
want: NewFromFloat(1.10),
},
{
name: "-1.454",
d: NewFromFloat(-1.454),
places: 1,
want: NewFromFloat(-1.5),
},
{
name: "-1.444",
d: NewFromFloat(-1.444),
places: 1,
want: NewFromFloat(-1.4),
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
if got := tt.d.RoundHalfDown(tt.places); !got.Equal(tt.want) {
t.Errorf("RoundHalfDown() = %v, want %v", got, tt.want)
}
})
}
}
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