package decimal
import (
"database/sql/driver"
"encoding/json"
"encoding/xml"
"math"
"math/big"
"reflect"
"sort"
"strconv"
"strings"
"testing"
"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", "", "10000000000000000000000000.00000000000000000098798978"},
{math.MaxInt64, strconv.FormatInt(math.MaxInt64, 10), "", strconv.FormatInt(math.MaxInt64, 10)},
{1.29067116156722e-309, "0", "", "0.000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001290671161567218558822290567835270536800098852722416870074139002112543896676308448335063375297788379444685193974290737962187240854947838776604607190387984577130572928111657710645015086812756013489109884753559084166516937690932698276436869274093950997935137476803610007959500457935217950764794724766740819156974617155861568214427828145972181876775307023388139991104942469299524961281641158436752347582767153796914843896176260096039358494077706152272661453132497761307744086665088096215425146090058519888494342944692629602847826300550628670375451325582843627504604013541465361435761965354140678551369499812124085312128659002910905639984075064968459581691226705666561364681985266583563078466180095375402399087817404368974165082030458595596655868575908243656158447265625000000000000000000000000000000000000004440000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"},
}
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",
"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.exact
d := NewFromFloat(x.float)
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 = NewFromFloat(n) }) {
t.Fatalf("Expected panic when creating a Decimal from %v, got %v instead", n, d.String())
}
}
}
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 TestFloat64(t *testing.T) {
for _, x := range testTable {
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),
}
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},
{"10", "10.0", true},
{"1.1", "1.10", true},
{"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() {
defer func() {
err = recover()
}()
d = RequireFromString(s)
}()
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 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 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 := `` + s + ``
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",
"7",
``,
``,
`nope`,
`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 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 Benchmark_FloorFast(b *testing.B) {
input := New(200, 2)
b.ResetTimer()
for i := 0; i < b.N; i++ {
input.Floor()
}
}
func Benchmark_FloorRegular(b *testing.B) {
input := New(200, -2)
b.ResetTimer()
for i := 0; i < b.N; i++ {
input.Floor()
}
}
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 {
panic(err)
}
// test Round
expected, err := NewFromString(test.expected)
if err != nil {
panic(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_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), int32(e1)))
d2 := sign2.Mul(New(int64(v2), int32(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)= 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 Benchmark_DivideOriginal(b *testing.B) {
tcs := createDivTestCases()
b.ResetTimer()
for i := 0; i < b.N; i++ {
for _, tc := range tcs {
d := tc.d
if sign(tc.d2) == 0 {
continue
}
d2 := tc.d2
prec := tc.prec
a := d.DivOld(d2, int(prec))
if sign(a) > 2 {
panic("dummy panic")
}
}
}
}
func Benchmark_DivideNew(b *testing.B) {
tcs := createDivTestCases()
b.ResetTimer()
for i := 0; i < b.N; i++ {
for _, tc := range tcs {
d := tc.d
if sign(tc.d2) == 0 {
continue
}
d2 := tc.d2
prec := tc.prec
a := d.DivRound(d2, prec)
if sign(a) > 2 {
panic("dummy panic")
}
}
}
}
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"},
{"6.42", 15, "6.40"},
{"6.39", 15, "6.40"},
{"6.35", 15, "6.30"},
{"6.36", 15, "6.40"},
{"6.349", 15, "6.30"},
{"6.30", 15, "6.30"},
{"666", 15, "666"},
{"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, 15, 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 BenchmarkDecimal_RoundCash_Five(b *testing.B) {
const want = "3.50"
for i := 0; i < b.N; i++ {
val := New(3478, -3)
if have := val.StringFixedCash(5); have != want {
b.Fatalf("\nHave: %q\nWant: %q", have, want)
}
}
}
func BenchmarkDecimal_RoundCash_Fifteen(b *testing.B) {
const want = "6.30"
for i := 0; i < b.N; i++ {
val := New(635, -2)
if have := val.StringFixedCash(15); have != want {
b.Fatalf("\nHave: %q\nWant: %q", have, want)
}
}
}
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{"24544.95034", ".3451204593"}: "0.3283950433",
Inp{".1", ".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",
}
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 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 TestDecimal_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
a := Decimal{}
dbvalue := float64(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.Equal(expected) {
t.Errorf("%s does not equal to %s", a, 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))
err = a.Scan(dbvalueFloat32)
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.Equal(expected) {
t.Errorf("%s does not equal to %s", a, 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.Equal(expected) {
t.Errorf("%s does not equal to %s", 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.Equal(expected) {
t.Errorf("%s does not equal to %s", 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.Equal(expected) {
t.Errorf("%s does not equal to %s", a, expected)
}
}
type foo struct{}
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 TestPow(t *testing.T) {
a := New(4, 0)
b := New(2, 0)
x := a.Pow(b)
if x.String() != "16" {
t.Errorf("Error, saw %s", x.String())
}
}
func TestNegativePow(t *testing.T) {
a := New(4, 0)
b := New(-2, 0)
x := a.Pow(b)
if x.String() != "0.0625" {
t.Errorf("Error, saw %s", x.String())
}
}
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)
}
}
type DecimalSlice []Decimal
func (p DecimalSlice) Len() int { return len(p) }
func (p DecimalSlice) Swap(i, j int) { p[i], p[j] = p[j], p[i] }
func (p DecimalSlice) Less(i, j int) bool { return p[i].Cmp(p[j]) < 0 }
func Benchmark_Cmp(b *testing.B) {
decimals := DecimalSlice([]Decimal{})
for i := 0; i < 1000000; i++ {
decimals = append(decimals, New(int64(i), 0))
}
b.ResetTimer()
for i := 0; i < b.N; i++ {
sort.Sort(decimals)
}
}
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 := float64(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 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)
}
}