mirror of
https://github.com/shopspring/decimal.git
synced 2024-11-22 20:40:48 +01:00
469 lines
9.7 KiB
Go
469 lines
9.7 KiB
Go
package decimal
|
|
|
|
import (
|
|
"math"
|
|
"testing"
|
|
)
|
|
|
|
var testTable = map[float64]string{
|
|
3.141592653589793: "3.141592653589793",
|
|
3: "3",
|
|
1234567890123456: "1234567890123456",
|
|
1234567890123456000: "1234567890123456000",
|
|
1234.567890123456: "1234.567890123456",
|
|
.1234567890123456: "0.1234567890123456",
|
|
0: "0",
|
|
.1111111111111110: "0.111111111111111",
|
|
.1111111111111111: "0.1111111111111111",
|
|
.1111111111111119: "0.1111111111111119",
|
|
.000000000000000001: "0.000000000000000001",
|
|
.000000000000000002: "0.000000000000000002",
|
|
.000000000000000003: "0.000000000000000003",
|
|
.000000000000000005: "0.000000000000000005",
|
|
.000000000000000008: "0.000000000000000008",
|
|
.1000000000000001: "0.1000000000000001",
|
|
.1000000000000002: "0.1000000000000002",
|
|
.1000000000000003: "0.1000000000000003",
|
|
.1000000000000005: "0.1000000000000005",
|
|
.1000000000000008: "0.1000000000000008",
|
|
}
|
|
|
|
func TestNewFromFloat(t *testing.T) {
|
|
// add negatives
|
|
for f, s := range testTable {
|
|
if f > 0 {
|
|
testTable[-f] = "-" + s
|
|
}
|
|
}
|
|
|
|
for f, s := range testTable {
|
|
d := NewFromFloat(f)
|
|
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) {
|
|
// add negatives
|
|
for f, s := range testTable {
|
|
if f > 0 {
|
|
testTable[-f] = "-" + s
|
|
}
|
|
}
|
|
|
|
for _, s := range testTable {
|
|
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)
|
|
}
|
|
}
|
|
}
|
|
|
|
func TestNewFromStringErrs(t *testing.T) {
|
|
tests := []string{
|
|
"",
|
|
"qwert",
|
|
"-",
|
|
".",
|
|
"-.",
|
|
".-",
|
|
"234-.56",
|
|
"234-56",
|
|
"2-",
|
|
"..",
|
|
"2..",
|
|
"..2",
|
|
".5.2",
|
|
"8..2",
|
|
"8.1.",
|
|
}
|
|
|
|
for _, s := range tests {
|
|
_, err := NewFromString(s)
|
|
|
|
if err == nil {
|
|
t.Errorf("error expected when parsing %s", s)
|
|
}
|
|
}
|
|
}
|
|
|
|
func TestNewFromFloatWithExponent(t *testing.T) {
|
|
type Inp struct {
|
|
float float64
|
|
exp int32
|
|
}
|
|
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",
|
|
}
|
|
|
|
// add negatives
|
|
for p, s := range tests {
|
|
if p.float > 0 {
|
|
tests[Inp{-p.float, p.exp}] = "-" + s
|
|
}
|
|
}
|
|
|
|
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 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_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.Div(New(1, -1)),
|
|
}
|
|
|
|
for _, d := range decs {
|
|
if d.String() != "0" {
|
|
t.Errorf("expected 0, got %s", d.String())
|
|
}
|
|
}
|
|
|
|
if a.Cmp(b) != 0 {
|
|
t.Errorf("a != b")
|
|
}
|
|
if a.Exponent() != 0 {
|
|
t.Errorf("a.Exponent() != 0")
|
|
}
|
|
}
|
|
|
|
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_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_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, expected := 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)
|
|
if got.String() != expected {
|
|
t.Errorf("expected %s when dividing %v by %v, got %v",
|
|
expected, num, denom, got)
|
|
}
|
|
}
|
|
|
|
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_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")
|
|
}
|
|
}
|
|
|
|
// 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_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 didPanic(f func()) bool {
|
|
ret := false
|
|
func() {
|
|
|
|
defer func() {
|
|
if message := recover(); message != nil {
|
|
ret = true
|
|
}
|
|
}()
|
|
|
|
// call the target function
|
|
f()
|
|
|
|
}()
|
|
|
|
return ret
|
|
|
|
}
|