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decimal_test.go
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decimal_test.go
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package udecimal
import (
"fmt"
"math"
"strconv"
"testing"
"github.com/shopspring/decimal"
"github.com/stretchr/testify/require"
)
func TestSetDefaultPrecision(t *testing.T) {
// NOTE: must be careful with tests that change the default prec
// it can affect other tests, especially tests in different packages which can run in parallel
defer SetDefaultPrecision(maxPrec)
require.Equal(t, uint8(19), defaultPrec)
SetDefaultPrecision(10)
require.Equal(t, uint8(10), defaultPrec)
// expect panic if prec is 0
require.PanicsWithValue(t, "prec must be greater than 0", func() {
SetDefaultPrecision(0)
})
// expect panic if prec is > maxPrec
require.PanicsWithValue(t, fmt.Sprintf("precision out of range. Only allow maximum %d digits after the decimal points", maxPrec), func() {
SetDefaultPrecision(maxPrec + 1)
})
}
func TestNewFromHiLo(t *testing.T) {
testcases := []struct {
neg bool
hi, lo uint64
prec uint8
want string
wantErr error
}{
{false, 18446744073709551546, 18446744073709551555, 19, "34028236692093846219.0549266345809149891", nil},
{false, math.MaxUint64, math.MaxUint64, 0, "340282366920938463463374607431768211455", nil},
{false, 0, 0, 0, "0", nil},
{false, 0, 0, 1, "0", nil},
{false, 0, 0, 19, "0", nil},
{false, 0, 1000000000000000000, 0, "1000000000000000000", nil},
{false, 1000000000000000000, 0, 0, "18446744073709551616000000000000000000", nil},
{false, 1000000000000000000, 1000000000000000000, 0, "18446744073709551617000000000000000000", nil},
{false, 1234567890123456789, 1234567890123456789, 0, "22773757910726981403490738691264577813", nil},
{false, 1234567890123456789, 1234567890123456789, 10, "2277375791072698140349073869.1264577813", nil},
{false, math.MaxUint64, math.MaxUint64, 19, "34028236692093846346.3374607431768211455", nil},
{true, 1234567890123456789, 1234567890123456789, 0, "-22773757910726981403490738691264577813", nil},
{false, math.MaxUint64, math.MaxUint64, 20, "", ErrPrecOutOfRange},
}
for _, tc := range testcases {
t.Run(fmt.Sprintf("%d %d", tc.hi, tc.lo), func(t *testing.T) {
d, err := NewFromHiLo(tc.neg, tc.hi, tc.lo, tc.prec)
if tc.wantErr != nil {
require.Equal(t, tc.wantErr, err)
return
}
require.NoError(t, err)
require.Equal(t, tc.want, d.String())
})
}
}
func TestParse(t *testing.T) {
testcases := []struct {
input, want string
wantErr error
}{
{"", "", ErrEmptyString},
{"1234567890123456789.1234567890123456789", "1234567890123456789.1234567890123456789", nil},
{"0.0000123456", "0.0000123456", nil},
{"-0.0000123456", "-0.0000123456", nil},
{"0.0101010101010101", "0.0101010101010101", nil},
{"123.456000", "123.456", nil},
{"1234567890123456789012345678901234567890", "1234567890123456789012345678901234567890", nil},
{"-12345678912345678901.1234567890123456789", "-12345678912345678901.1234567890123456789", nil},
{"123.0000", "123", nil},
{"0.123", "0.123", nil},
{"-0.123", "-0.123", nil},
{"0", "0", nil},
{"0.00000", "0", nil},
{"-0", "0", nil},
{"-0.00000", "0", nil},
{"-123.0000", "-123", nil},
{"0.9999999999999999999", "0.9999999999999999999", nil},
{"-0.9999999999999999999", "-0.9999999999999999999", nil},
{"1", "1", nil},
{"123", "123", nil},
{"123.456", "123.456", nil},
{"123.456789012345678901", "123.456789012345678901", nil},
{"123456789.123456789", "123456789.123456789", nil},
{"-1", "-1", nil},
{"-123", "-123", nil},
{"-123.456", "-123.456", nil},
{"-123.456789012345678901", "-123.456789012345678901", nil},
{"-123456789.123456789", "-123456789.123456789", nil},
{"-123456789123456789.123456789123456789", "-123456789123456789.123456789123456789", nil},
{"-123456.123456", "-123456.123456", nil},
{"1234567891234567890.0123456879123456789", "1234567891234567890.0123456879123456789", nil},
{"9999999999999999999.9999999999999999999", "9999999999999999999.9999999999999999999", nil},
{"-9999999999999999999.9999999999999999999", "-9999999999999999999.9999999999999999999", nil},
{"123456.0000000000000000001", "123456.0000000000000000001", nil},
{"-123456.0000000000000000001", "-123456.0000000000000000001", nil},
{"+123456.123456", "123456.123456", nil},
{"+123.123", "123.123", nil},
{"12345678901234567890.123456789", "12345678901234567890.123456789", nil},
{"1234567890123456789012345678901234567890", "1234567890123456789012345678901234567890", nil},
{"1234567890123456789123456789012345678901", "1234567890123456789123456789012345678901", nil},
{"340282366920938463463374607431768211459", "340282366920938463463374607431768211459", nil},
{"340282366920938463463374607431768211459.123", "340282366920938463463374607431768211459.123", nil},
{"+340282366920938463463374607431768211459", "340282366920938463463374607431768211459", nil},
{"340282366920938463463374607431768211459.", "", fmt.Errorf("%w: can't parse '340282366920938463463374607431768211459.' to Decimal", ErrInvalidFormat)},
{"--340282366920938463463374607431768211459", "", fmt.Errorf("%w: can't parse '--340282366920938463463374607431768211459' to Decimal", ErrInvalidFormat)},
{".1234567890123456789012345678901234567890123456", "", fmt.Errorf("%w: can't parse '.1234567890123456789012345678901234567890123456' to Decimal", ErrInvalidFormat)},
{"+.1234567890123456789012345678901234567890123456", "", fmt.Errorf("%w: can't parse '+.1234567890123456789012345678901234567890123456' to Decimal", ErrInvalidFormat)},
{"-.1234567890123456789012345678901234567890123456", "", fmt.Errorf("%w: can't parse '-.1234567890123456789012345678901234567890123456' to Decimal", ErrInvalidFormat)},
{"1.12345678901234567890123.45678901234567890123456", "", fmt.Errorf("%w: can't parse '1.12345678901234567890123.45678901234567890123456' to Decimal", ErrInvalidFormat)},
{"340282366920938463463374607431768211459.123+--", "", fmt.Errorf("%w: can't parse '340282366920938463463374607431768211459.123+--' to Decimal", ErrInvalidFormat)},
{"1.234567890123456789012348901", "", ErrPrecOutOfRange},
{"1.123456789012345678912345678901234567890123456", "", ErrPrecOutOfRange},
{".", "", fmt.Errorf("%w: can't parse '.' to Decimal", ErrInvalidFormat)},
{"123.", "", fmt.Errorf("%w: can't parse '123.' to Decimal", ErrInvalidFormat)},
{"-123.", "", fmt.Errorf("%w: can't parse '-123.' to Decimal", ErrInvalidFormat)},
{"-.123456", "", fmt.Errorf("%w: can't parse '-.123456' to Decimal", ErrInvalidFormat)},
{"12c45.123456", "", fmt.Errorf("%w: can't parse '12c45.123456' to Decimal", ErrInvalidFormat)},
{"1245.-123456", "", fmt.Errorf("%w: can't parse '1245.-123456' to Decimal", ErrInvalidFormat)},
{"1245.123.456", "", fmt.Errorf("%w: can't parse '1245.123.456' to Decimal", ErrInvalidFormat)},
{"12345..123456", "", fmt.Errorf("%w: can't parse '12345..123456' to Decimal", ErrInvalidFormat)},
{"123456.123c456", "", fmt.Errorf("%w: can't parse '123456.123c456' to Decimal", ErrInvalidFormat)},
{"+.", "", fmt.Errorf("%w: can't parse '+.' to Decimal", ErrInvalidFormat)},
{"+", "", fmt.Errorf("%w: can't parse '+' to Decimal", ErrInvalidFormat)},
{"-", "", fmt.Errorf("%w: can't parse '-' to Decimal", ErrInvalidFormat)},
}
for _, tc := range testcases {
t.Run(tc.input, func(t *testing.T) {
d, err := Parse(tc.input)
if tc.wantErr != nil {
require.Equal(t, tc.wantErr, err)
return
}
require.NoError(t, err)
require.Equal(t, tc.want, d.String())
// compare with shopspring/decimal
dd, err := decimal.NewFromString(tc.input)
require.NoError(t, err)
require.Equal(t, dd.String(), d.String())
})
}
}
func TestMustParse(t *testing.T) {
testcases := []struct {
s string
wantErr error
}{
{"0.123", nil},
{"-0.123", nil},
{"0", nil},
{"0.9999999999999999999", nil},
{"-0.9999999999999999999", nil},
{"1", nil},
{"123", nil},
{"123.456", nil},
{"123.456789012345678901", nil},
{"123456789.123456789", nil},
{"-123456789123456789.123456789123456789", nil},
{"-123456.123456", nil},
{"1234567891234567890.0123456879123456789", nil},
{"9999999999999999999.9999999999999999999", nil},
{"-9999999999999999999.9999999999999999999", nil},
{"123456.0000000000000000001", nil},
{"-123456.0000000000000000001", nil},
{"+123456.123456", nil},
{"+123.123", nil},
{"-12345678912345678901.1234567890123456789", nil},
{"12345678901234567890.123456789", nil},
{"1234567890123456789123456789012345678901", nil},
{"340282366920938463463374607431768211459", nil},
{"1.234567890123456789012348901", ErrPrecOutOfRange},
{"", ErrEmptyString},
{".", fmt.Errorf("%w: can't parse '.' to Decimal", ErrInvalidFormat)},
{"123.", fmt.Errorf("%w: can't parse '123.' to Decimal", ErrInvalidFormat)},
{"-123.", fmt.Errorf("%w: can't parse '-123.' to Decimal", ErrInvalidFormat)},
{"-.123456", fmt.Errorf("%w: can't parse '-.123456' to Decimal", ErrInvalidFormat)},
{"12c45.123456", fmt.Errorf("%w: can't parse '12c45.123456' to Decimal", ErrInvalidFormat)},
{"12345..123456", fmt.Errorf("%w: can't parse '12345..123456' to Decimal", ErrInvalidFormat)},
{"+.", fmt.Errorf("%w: can't parse '+.' to Decimal", ErrInvalidFormat)},
{"+", fmt.Errorf("%w: can't parse '+' to Decimal", ErrInvalidFormat)},
{"-", fmt.Errorf("%w: can't parse '-' to Decimal", ErrInvalidFormat)},
}
for _, tc := range testcases {
t.Run(tc.s, func(t *testing.T) {
if tc.wantErr != nil {
require.PanicsWithError(t, tc.wantErr.Error(), func() {
MustParse(tc.s)
})
return
}
var d Decimal
require.NotPanics(t, func() {
d = MustParse(tc.s)
})
if tc.s[0] == '+' {
require.Equal(t, tc.s[1:], d.String())
} else {
require.Equal(t, tc.s, d.String())
}
})
}
}
func TestNewFromInt64(t *testing.T) {
testcases := []struct {
input int64
prec uint8 // prec of decimal
s string
wantErr error
}{
{0, 0, "0", nil},
{0, 1, "0", nil},
{0, 19, "0", nil},
{1000000000000000000, 0, "1000000000000000000", nil},
{10000, 4, "1", nil},
{10000, 5, "0.1", nil},
{123456000, 6, "123.456", nil},
{0, 20, "0", ErrPrecOutOfRange},
{0, 41, "0", ErrPrecOutOfRange},
{1, 0, "1", nil},
{-1, 0, "-1", nil},
{1, 5, "0.00001", nil},
{-1, 5, "-0.00001", nil},
{1, 19, "0.0000000000000000001", nil},
{-1, 19, "-0.0000000000000000001", nil},
{math.MaxInt64, 0, "9223372036854775807", nil},
{-math.MaxInt64, 0, "-9223372036854775807", nil},
{math.MaxInt64, 19, "0.9223372036854775807", nil},
{-math.MaxInt64, 19, "-0.9223372036854775807", nil},
}
for _, tc := range testcases {
t.Run(strconv.FormatInt(tc.input, 10), func(t *testing.T) {
d, err := NewFromInt64(tc.input, tc.prec)
if tc.wantErr != nil {
require.Equal(t, tc.wantErr, err)
return
}
require.NoError(t, err)
require.Equal(t, tc.s, d.String())
})
}
}
func TestMustFromInt64(t *testing.T) {
testcases := []struct {
input int64
prec uint8 // prec of decimal
s string
wantErr error
}{
{0, 0, "0", nil},
{0, 1, "0", nil},
{0, 19, "0", nil},
{1000000000000000000, 0, "1000000000000000000", nil},
{10000, 4, "1", nil},
{10000, 5, "0.1", nil},
{123456000, 6, "123.456", nil},
{0, 20, "0", ErrPrecOutOfRange},
{0, 41, "0", ErrPrecOutOfRange},
{1, 0, "1", nil},
{-1, 0, "-1", nil},
{1, 5, "0.00001", nil},
{-1, 5, "-0.00001", nil},
{1, 19, "0.0000000000000000001", nil},
{-1, 19, "-0.0000000000000000001", nil},
{math.MaxInt64, 0, "9223372036854775807", nil},
{-math.MaxInt64, 0, "-9223372036854775807", nil},
{math.MaxInt64, 19, "0.9223372036854775807", nil},
{-math.MaxInt64, 19, "-0.9223372036854775807", nil},
}
for _, tc := range testcases {
t.Run(strconv.FormatInt(tc.input, 10), func(t *testing.T) {
if tc.wantErr != nil {
require.PanicsWithError(t, tc.wantErr.Error(), func() {
_ = MustFromInt64(tc.input, tc.prec)
})
return
}
d := MustFromInt64(tc.input, tc.prec)
require.Equal(t, tc.s, d.String())
})
}
}
func TestNewFromUint64(t *testing.T) {
testcases := []struct {
input uint64
prec uint8 // prec of decimal
s string
wantErr error
}{
{0, 0, "0", nil},
{0, 1, "0", nil},
{0, 19, "0", nil},
{1000000000000000000, 0, "1000000000000000000", nil},
{10000, 4, "1", nil},
{10000, 5, "0.1", nil},
{123456000, 6, "123.456", nil},
{0, 20, "0", ErrPrecOutOfRange},
{0, 41, "0", ErrPrecOutOfRange},
{1, 0, "1", nil},
{1, 5, "0.00001", nil},
{1, 19, "0.0000000000000000001", nil},
{math.MaxUint64, 0, "18446744073709551615", nil},
{math.MaxUint64, 19, "1.8446744073709551615", nil},
}
for _, tc := range testcases {
t.Run(strconv.FormatUint(tc.input, 10), func(t *testing.T) {
d, err := NewFromUint64(tc.input, tc.prec)
if tc.wantErr != nil {
require.Equal(t, tc.wantErr, err)
return
}
require.NoError(t, err)
require.Equal(t, tc.s, d.String())
})
}
}
func TestMustFromUint64(t *testing.T) {
testcases := []struct {
input uint64
prec uint8 // prec of decimal
s string
wantErr error
}{
{0, 0, "0", nil},
{0, 1, "0", nil},
{0, 19, "0", nil},
{1000000000000000000, 0, "1000000000000000000", nil},
{10000, 4, "1", nil},
{10000, 5, "0.1", nil},
{123456000, 6, "123.456", nil},
{0, 20, "0", ErrPrecOutOfRange},
{0, 41, "0", ErrPrecOutOfRange},
{1, 0, "1", nil},
{1, 5, "0.00001", nil},
{1, 19, "0.0000000000000000001", nil},
{math.MaxUint64, 0, "18446744073709551615", nil},
{math.MaxUint64, 19, "1.8446744073709551615", nil},
}
for _, tc := range testcases {
t.Run(strconv.FormatUint(tc.input, 10), func(t *testing.T) {
if tc.wantErr != nil {
require.PanicsWithError(t, tc.wantErr.Error(), func() {
_ = MustFromUint64(tc.input, tc.prec)
})
return
}
d := MustFromUint64(tc.input, tc.prec)
require.Equal(t, tc.s, d.String())
})
}
}
func TestNewFromFloat64(t *testing.T) {
testcases := []struct {
input float64
s string
wantErr error
}{
{0, "0", nil},
{0.123, "0.123", nil},
{-0.123, "-0.123", nil},
{1, "1", nil},
{-1, "-1", nil},
{1.00009, "1.00009", nil},
{1000000.123456, "1000000.123456", nil},
{-1000000.123456, "-1000000.123456", nil},
{1.1234567890123456789123, "1.1234567890123457", nil},
{123456789.1234567890123456789, "123456789.12345679", nil},
{-1.1234567890123456789, "-1.1234567890123457", nil},
{123.123000, "123.123", nil},
{-123.123000, "-123.123", nil},
{math.NaN(), "0", fmt.Errorf("%w: can't parse float 'NaN' to Decimal", ErrInvalidFormat)},
{math.Inf(1), "0", fmt.Errorf("%w: can't parse float '+Inf' to Decimal", ErrInvalidFormat)},
{math.Inf(-1), "0", fmt.Errorf("%w: can't parse float '-Inf' to Decimal", ErrInvalidFormat)},
}
for i, tc := range testcases {
t.Run(fmt.Sprintf("%d: %f", i, tc.input), func(t *testing.T) {
d, err := NewFromFloat64(tc.input)
if tc.wantErr != nil {
require.EqualError(t, tc.wantErr, err.Error())
return
}
require.NoError(t, err)
require.Equal(t, tc.s, d.String())
})
}
}
func TestMustFromFloat64(t *testing.T) {
testcases := []struct {
input float64
s string
wantErr error
}{
{0, "0", nil},
{0.123, "0.123", nil},
{-0.123, "-0.123", nil},
{1, "1", nil},
{-1, "-1", nil},
{1000000.123456, "1000000.123456", nil},
{-1000000.123456, "-1000000.123456", nil},
{1.1234567890123456789123, "1.1234567890123457", nil},
{123456789.1234567890123456789, "123456789.12345679", nil},
{-1.1234567890123456789, "-1.1234567890123457", nil},
{123.123000, "123.123", nil},
{-123.123000, "-123.123", nil},
{math.NaN(), "0", fmt.Errorf("%w: can't parse float 'NaN' to Decimal", ErrInvalidFormat)},
{math.Inf(1), "0", fmt.Errorf("%w: can't parse float '+Inf' to Decimal", ErrInvalidFormat)},
{math.Inf(-1), "0", fmt.Errorf("%w: can't parse float '-Inf' to Decimal", ErrInvalidFormat)},
}
for _, tc := range testcases {
t.Run(strconv.FormatFloat(tc.input, 'f', -1, 64), func(t *testing.T) {
if tc.wantErr != nil {
require.PanicsWithError(t, tc.wantErr.Error(), func() {
_ = MustFromFloat64(tc.input)
})
return
}
d := MustFromFloat64(tc.input)
require.Equal(t, tc.s, d.String())
})
}
}
func assertOverflow(t *testing.T, d Decimal, isOverflow bool) {
if isOverflow {
require.True(t, d.coef.overflow())
require.NotNil(t, d.coef.bigInt)
} else {
require.False(t, d.coef.overflow())
require.Nil(t, d.coef.bigInt)
}
}
func TestAdd(t *testing.T) {
testcases := []struct {
a, b string
overflow bool
}{
{"1", "2", false},
{"1234567890123456789", "1234567890123456879", false},
{"-1234567890123456789", "-1234567890123456879", false},
{"-1234567890123456789", "1234567890123456879", false},
{"1234567890123456789", "-1234567890123456879", false},
{"1111111111111", "1111.123456789123456789", false},
{"-1111111111111", "1111.123456789123456789", false},
{"1111111111111", "-1111.123456789123456789", false},
{"-1111111111111", "-1111.123456789123456789", false},
{"123456789012345678.9", "0.1", false},
{"123456789", "1.1234567890123456789", false},
{"1234567890123456789.1234567890123456789", "1234567890123456789.1234567890123456789", false},
{"1234567890123456789.1234567890123456789", "-1234567890123456789.1234567890123456789", false},
{"-1234567890123456789.1234567890123456789", "1234567890123456789.1234567890123456789", false},
{"-1234567890123456789.1234567890123456789", "-1234567890123456789.1234567890123456789", false},
{"2345678901234567899", "1234567890123456789.1234567890123456789", false},
{"-1111111111111", "1111.123456789123456789", false},
{"-123456789", "1.1234567890123456789", false},
{"-2345678901234567899", "1234567890123456789.1234567890123456789", false},
{"1111111111111", "-1111.123456789123456789", false},
{"123456789", "-1.1234567890123456789", false},
{"2345678901234567899", "-1234567890123456789.1234567890123456789", false},
{"-1111111111111", "-1111.123456789123456789", false},
{"-123456789", "-1.1234567890123456789", false},
{"-2345678901234567899", "-1234567890123456789.1234567890123456789", false},
{"1", "1111.123456789123456789", false},
{"1", "1.123456789123456789", false},
{"123456789123456789.123456789", "3.123456789", false},
{"123456789123456789.123456789", "3", false},
{"9999999999999999999.9999999999999999999", "-0.999", false},
{"-9999999999999999999.9999999999999999999", "0.999", false},
{"0.999", "-9999999999999999999.9999999999999999999", false},
{"-0.999", "9999999999999999999.9999999999999999999", false},
{"9999999999999999999", "1", false},
{"-9999999999999999999", "-1", false},
{"9999999999999999999.99999999999999", "0.00000000000001", false},
{"-9999999999999999999.9999999999999999999", "-0.0000000000000000001", false},
{"9999999999999999999.9999999999999999999", "0.0000000000000000001", false},
{"0.0000000000000000001", "9999999999999999999.9999999999999999999", false},
{"-0.0000000000000000001", "-9999999999999999999.9999999999999999999", false},
{"9999999999999999999.9999999999999999999", "-9999999999999999999.9999999999999999999", false},
{"-9999999999999999999.9999999999999999999", "9999999999999999999.9999999999999999999", false},
{"9999999999999999999.9999999999999999999", "0.999", false},
{"0.999", "9999999999999999999.9999999999999999999", false},
{"9999999999999999999.9999999999999999999", "999999999999999999.999", false},
{"9999999999999999999.9999999999999999999", "9999999999999999999.9999999999999999999", false},
{"-9999999999999999999.9999999999999999999", "-9999999999999999999.9999999999999999999", false},
{"1234567890123456789012345678901234567890.1234567890123456789", "-1234567890123456789012345678901234567890.1234567890123456789", false},
{"-1234567890123456789012345678901234567890.1234567890123456789", "1234567890123456789012345678901234567890.1234567890123456789", false},
{"1234567890123456789012345678901234567890.1234567890123456789", "1234567890123456789012345678901234567890.1234567890123456789", true},
{"-1234567890123456789012345678901234567890.1234567890123456789", "-1234567890123456789012345678901234567890.1234567890123456789", true},
}
for _, tc := range testcases {
t.Run(tc.a+"+"+tc.b, func(t *testing.T) {
a, err := Parse(tc.a)
require.NoError(t, err)
b, err := Parse(tc.b)
require.NoError(t, err)
aStr := a.String()
bStr := b.String()
c := a.Add(b)
assertOverflow(t, c, tc.overflow)
// make sure a and b are immutable
require.Equal(t, aStr, a.String())
require.Equal(t, bStr, b.String())
// compare with shopspring/decimal
aa := decimal.RequireFromString(tc.a)
bb := decimal.RequireFromString(tc.b)
// nolint: gosec
prec := int32(c.Prec())
cc := aa.Add(bb).Truncate(prec)
require.Equal(t, cc.String(), c.String())
})
}
}
func TestAdd64(t *testing.T) {
testcases := []struct {
a string
b uint64
overflow bool
}{
{"1234567890123456789", 1, false},
{"1234567890123456789", 2, false},
{"123456789012345678.9", 1, false},
{"111111111111", 1111, false},
{"1.1234567890123456789", 123456789, false},
{"-123.456", 123456789, false},
{"9999999999999999999", 1, false},
{"-1234567890123456789.123456789", 123456789, false},
{"1234567890123456789.123456789", math.MaxUint64, false},
{"-1234567890123456789.123456789", math.MaxUint64, false},
{"-1234567890123456789.123456789", 10_000_000_000_000_000_000, false},
{"1234567890123456789.123456789", 10_000_000_000_000_000_000, false},
{"9999999999999999999.9999999999999999999", 10_000_000_000_000_000_000, false},
{"1234567890123456789012345678901234567890.1234567890123456789", 123456789, true},
{"-1234567890123456789012345678901234567890.1234567890123456789", 123456789, true},
}
for i, tc := range testcases {
t.Run(fmt.Sprintf("#%d", i), func(t *testing.T) {
a, err := Parse(tc.a)
require.NoError(t, err)
aStr := a.String()
c := a.Add64(tc.b)
assertOverflow(t, c, tc.overflow)
// make sure a is immutable
require.Equal(t, aStr, a.String())
// compare with shopspring/decimal
aa := decimal.RequireFromString(tc.a)
bb := decimal.NewFromUint64(tc.b)
prec := int32(c.Prec())
cc := aa.Add(bb).Truncate(prec)
require.Equal(t, cc.String(), c.String())
})
}
}
func TestSub(t *testing.T) {
testcases := []struct {
a, b string
overflow bool
}{
{"1", "1111.123456789123456789", false},
{"1", "1.123456789123456789", false},
{"1", "2", false},
{"1", "3", false},
{"1", "4", false},
{"1", "5", false},
{"1234567890123456789", "1", false},
{"1234567890123456789", "2", false},
{"123456789012345678.9", "0.1", false},
{"1111111111111", "1111.123456789123456789", false},
{"123456789", "1.1234567890123456789", false},
{"2345678901234567899", "1234567890123456789.1234567890123456789", false},
{"-1111111111111", "1111.123456789123456789", false},
{"-123456789", "1.1234567890123456789", false},
{"-2345678901234567899", "1234567890123456789.1234567890123456789", false},
{"1111111111111", "-1111.123456789123456789", false},
{"123456789", "-1.1234567890123456789", false},
{"2345678901234567899", "-1234567890123456789.1234567890123456789", false},
{"-1111111111111", "-1111.123456789123456789", false},
{"-123456789", "-1.1234567890123456789", false},
{"-2345678901234567899", "-1234567890123456789.1234567890123456789", false},
{"123456789123456789.123456789", "3.123456789", false},
{"123456789123456789.123456789", "3", false},
{"9999999999999999999.9999999999999999999", "0.999", false},
{"9999999999999999999", "-1", false},
{"-9999999999999999999", "1", false},
{"9999999999999999999.99999999999999", "-0.00000000000001", false},
{"9999999999999999999.9999999999999999999", "-0.0000000000000000001", false},
{"-9999999999999999999.9999999999999999999", "0.0000000000000000001", false},
{"-0.0000000000000000001", "9999999999999999999.9999999999999999999", false},
{"0.0000000000000000001", "-9999999999999999999.9999999999999999999", false},
{"9999999999999999999.9999999999999999999", "-0.999", false},
{"-9999999999999999999.9999999999999999999", "0.999", false},
{"0.999", "-9999999999999999999.9999999999999999999", false},
{"-0.999", "9999999999999999999.9999999999999999999", false},
{"1234567890123456789012345678901234567890.1234567890123456789", "1234567890123456789012345678901234567890.1234567890123456789", false},
{"-1234567890123456789012345678901234567890.1234567890123456789", "-1234567890123456789012345678901234567890.1234567890123456789", false},
{"1234567890123456789012345678901234567890.1234567890123456789", "-1234567890123456789012345678901234567890.1234567890123456789", true},
{"-1234567890123456789012345678901234567890.1234567890123456789", "1234567890123456789012345678901234567890.1234567890123456789", true},
}
for _, tc := range testcases {
t.Run(tc.a+"/"+tc.b, func(t *testing.T) {
a, err := Parse(tc.a)
require.NoError(t, err)
b, err := Parse(tc.b)
require.NoError(t, err)
aStr := a.String()
bStr := b.String()
c := a.Sub(b)
assertOverflow(t, c, tc.overflow)
// make sure a and b are immutable
require.Equal(t, aStr, a.String())
require.Equal(t, bStr, b.String())
// compare with shopspring/decimal
aa := decimal.RequireFromString(tc.a)
bb := decimal.RequireFromString(tc.b)
prec := int32(c.Prec())
cc := aa.Sub(bb).Truncate(prec)
require.Equal(t, cc.String(), c.String())
})
}
}
func TestSub64(t *testing.T) {
testcases := []struct {
a string
b uint64
overflow bool
}{
{"1234567890123456789", 1, false},
{"1234567890123456789", 2, false},
{"123456789012345678.9", 1, false},
{"111111111111", 1111, false},
{"1.1234567890123456789", 123456789, false},
{"-123.456", 123456789, false},
{"-1234567890123456789.123456789", 123456789, false},
{"1234567890123456789.123456789", 10_000_000_000_000_000_000, false},
{"1234567890123456789.123456789", math.MaxUint64, false},
{"-1234567890123456789.123456789", math.MaxUint64, false},
{"-1234567890123456789.123456789", 10_000_000_000_000_000_000, false},
{"-9999999999999999999", 1, false},
{"-9999999999999999999.9999999999999999999", 10_000_000_000_000_000_000, false},
{"1234567890123456789012345678901234567890.1234567890123456789", 123456789, true},
{"-1234567890123456789012345678901234567890.1234567890123456789", 123456789, true},
}
for _, tc := range testcases {
t.Run(fmt.Sprintf("%s-%d", tc.a, tc.b), func(t *testing.T) {
a, err := Parse(tc.a)
require.NoError(t, err)
aStr := a.String()
c := a.Sub64(tc.b)
assertOverflow(t, c, tc.overflow)
// make sure a is immutable
require.Equal(t, aStr, a.String())
// compare with shopspring/decimal
aa := decimal.RequireFromString(tc.a)
bb := decimal.NewFromUint64(tc.b)
prec := int32(c.Prec())
cc := aa.Sub(bb).Truncate(prec)
require.Equal(t, cc.String(), c.String())
})
}
}
func TestMul(t *testing.T) {
testcases := []struct {
a, b string
overflow bool
}{
{"12.9127208515966861312", "2271218470587341123.616768", false},
{"2277375793122336353220649475.264577813", "126", false},
{"123456.1234567890123456789", "0", false},
{"123456.1234567890123456789", "123456.1234567890123456789", false},
{"123456.1234567890123456789", "-123456.1234567890123456789", false},
{"-123456.1234567890123456789", "123456.1234567890123456789", false},
{"-123456.1234567890123456789", "-123456.1234567890123456789", false},
{"9999999999999999999", "0.999", false},
{"1234567890123456789", "1", false},
{"1234567890123456789", "2", false},
{"123456789012345678.9", "0.1", false},
{"1111111111111", "1111.123456789123456789", false},
{"123456789", "1.1234567890123456789", false},
{"1", "1111.123456789123456789", false},
{"1", "1.123456789123456789", false},
{"1", "2", false},
{"1", "3", false},
{"1", "4", false},
{"1", "5", false},
{"1000000", "10000000000000", false},
{"-1000000", "10000000000000", false},
{"-1000000", "-10000000000000", false},
{"1000000", "-10000000000000", false},
{"123456789123456789.123456789", "3.123456789", false},
{"123456789123456789.123456789", "3", false},
{"1.123456789123456789", "1.123456789123456789", false},
{"1234567890123456789.1234567890123456789", "123456", true},
{"1234567890123456789.1234567890123456789", "123456.1234567890123456789", true},
{"100000000000000000000", "100000000000000000000", true},
{"-100000000000000000000", "100000000000000000000", true},
{"-100000000000000000000", "-100000000000000000000", true},
{"100000000000000000000", "-100000000000000000000", true},
{"1000000000000000000000000.1234567890123456789", "-100000000000000000000", true},
{"1234567890123456789012345678901234567890.1234567890123456789", "1234567890123456789012345678901234567890.1234567890123456789", true},
{"1234567890123456789012345678901234567890.1234567890123456789", "-1234567890123456789012345678901234567890.1234567890123456789", true},
{"-1234567890123456789012345678901234567890.1234567890123456789", "1234567890123456789012345678901234567890.1234567890123456789", true},
{"-1234567890123456789012345678901234567890.1234567890123456789", "-1234567890123456789012345678901234567890.1234567890123456789", true},
}
for _, tc := range testcases {
t.Run(tc.a+"/"+tc.b, func(t *testing.T) {
a, err := Parse(tc.a)
require.NoError(t, err)
b, err := Parse(tc.b)
require.NoError(t, err)
aStr := a.String()
bStr := b.String()
c := a.Mul(b)
assertOverflow(t, c, tc.overflow)
// make sure a and b are immutable
require.Equal(t, aStr, a.String())
require.Equal(t, bStr, b.String())
// compare with shopspring/decimal
aa := decimal.RequireFromString(tc.a)
bb := decimal.RequireFromString(tc.b)
prec := int32(c.Prec())
cc := aa.Mul(bb).Truncate(prec)
require.Equal(t, cc.String(), c.String())
})
}
}
func TestMul64(t *testing.T) {
testcases := []struct {
a string
b uint64
overflow bool
}{
{"1234567890123456789", 0, false},
{"0", 123456789, false},
{"1234567890123456789", 1, false},
{"1234567890123456789", 2, false},
{"123456789012345678.9", 1, false},
{"111111111111", 1111, false},
{"1.1234567890123456789", 123456789, false},
{"-123.456", 123456789, false},
{"0.1234567890123456789", 10_000_000_000_000_000_000, false},
{"1000000", 10_000_000_000_000, false},
{"-1000000", 10_000_000_000_000, false},
{"10000000000000", 1_000_000, false},
{"-10000000000000", 1_000_000, false},
{"1234567890123456789.123456789", math.MaxUint64, true},
{"9999999999999999999.9999999999999999999", 10_000_000_000_000_000_000, true},
{"123.9999999999999999999", 10_000_000_000_000_000_000, true},
{"1234567890123456789012345678901234567890.1234567890123456789", 123456789, true},
{"-1234567890123456789012345678901234567890.1234567890123456789", 123456789, true},
}
for _, tc := range testcases {
t.Run(tc.a, func(t *testing.T) {
a, err := Parse(tc.a)
require.NoError(t, err)
aStr := a.String()
c := a.Mul64(tc.b)
assertOverflow(t, c, tc.overflow)
// make sure a is immutable
require.Equal(t, aStr, a.String())
// compare with shopspring/decimal
aa := decimal.RequireFromString(tc.a)
bb := decimal.NewFromUint64(tc.b)
prec := int32(c.Prec())
cc := aa.Mul(bb).Truncate(prec)
require.Equal(t, cc.String(), c.String())
})
}
}
func TestDiv(t *testing.T) {
testcases := []struct {
a, b string
overflow bool
wantErr error
}{
{"1844674407370955161.5999999999", "18446744073709551616", false, nil},
{"1000000000000", "0.0000001", false, nil},
{"479615345916448342049", "1494.186269970473681015", true, nil},
{"123456.1234567890123456789", "234567.1234567890123456789", false, nil},
{"123456.1234567890123456789", "1", false, nil},
{"-123456.1234567890123456789", "234567.1234567890123456789", false, nil},
{"123456.1234567890123456789", "-234567.1234567890123456789", false, nil},
{"-123456.1234567890123456789", "-234567.1234567890123456789", false, nil},
{"9999999999999999999", "1.0001", false, nil},
{"-9999999999999999999.9999999999999999999", "9999999999999999999", false, nil},
{"1234567890123456789", "1", false, nil},
{"1234567890123456789", "2", false, nil},
{"123456789012345678.9", "0.1", false, nil},
{"1111111111111", "1111.123456789123456789", false, nil},
{"123456789", "1.1234567890123456789", false, nil},
{"2345678901234567899", "1234567890123456789.1234567890123456789", false, nil},
{"0.1234567890123456789", "0.04586201546101", false, nil},
{"1", "1111.123456789123456789", false, nil},
{"1", "1.123456789123456789", false, nil},
{"1", "2", false, nil},
{"1", "3", false, nil},
{"1", "4", false, nil},
{"1", "5", false, nil},
{"1234567890123456789.1234567890123456879", "1111.1789", false, nil},
{"123456789123456789.123456789", "3.123456789", false, nil},
{"123456789123456789.123456789", "3", false, nil},
{"9999999999999999999", "1234567890123456789.1234567890123456879", false, nil},
{"9999999999999999999.999999999999999999", "1000000000000000000.1234567890123456789", false, nil},
{"999999999999999999", "0.100000000000001", false, nil},
{"123456789123456789.123456789", "0", false, ErrDivideByZero},
{"1234567890123456789.1234567890123456789", "0.0000000000000000002", true, nil},
{"1234567890123456789.1234567890123456789", "0.000000001", true, nil},
{"1000000000000000000000000.1234567890123456789", "-100000000000000000000", true, nil},
{"1234567890123456789012345678901234567890.1234567890123456789", "1234567890123456789012345678901234567890.1234567890123456789", true, nil},
{"1234567890123456789012345678901234567890.1234567890123456789", "-1234567890123456789012345678901234567890.1234567890123456789", true, nil},
{"-1234567890123456789012345678901234567890.1234567890123456789", "1234567890123456789012345678901234567890.1234567890123456789", true, nil},
{"-1234567890123456789012345678901234567890.1234567890123456789", "-1234567890123456789012345678901234567890.1234567890123456789", true, nil},
}
for _, tc := range testcases {
t.Run(tc.a+"/"+tc.b, func(t *testing.T) {
a, err := Parse(tc.a)
require.NoError(t, err)
b, err := Parse(tc.b)
require.NoError(t, err)
aStr := a.String()
bStr := b.String()
c, err := a.Div(b)
if tc.wantErr != nil {
require.Equal(t, tc.wantErr, err)
return
}
require.NoError(t, err)
assertOverflow(t, c, tc.overflow)
// make sure a and b are immutable
require.Equal(t, aStr, a.String())
require.Equal(t, bStr, b.String())
// compare with shopspring/decimal
aa := decimal.RequireFromString(tc.a)
bb := decimal.RequireFromString(tc.b)
prec := int32(c.Prec())
cc := aa.DivRound(bb, 28).Truncate(prec)
// sometimes shopspring/decimal does rounding differently
// e.g. 0.099999999999999 -> 0.1
// so to check the result, we can check the difference
// between our result and shopspring/decimal result
// valid result should be less than or equal to 1e-19, which is our smallest unit
d := MustParse(cc.String())
e := c.Sub(d)
require.LessOrEqual(t, e.Abs().Cmp(oneUnit), 0, "expected %s, got %s", cc.String(), c.String())
})
}
}
func TestDivWithCustomPrecision(t *testing.T) {
SetDefaultPrecision(14)
defer SetDefaultPrecision(maxPrec)
testcases := []struct {
a, b string
overflow bool
wantErr error
parseErr error
}{
{"123456.1234567890123456789", "1", false, nil, ErrPrecOutOfRange},
{"123456.1234567890123456789", "234567.1234567890123456789", false, nil, ErrPrecOutOfRange},
{"-123456.1234567890123456789", "234567.1234567890123456789", false, nil, ErrPrecOutOfRange},
{"123456.1234567890123456789", "-234567.1234567890123456789", false, nil, ErrPrecOutOfRange},
{"-123456.1234567890123456789", "-234567.1234567890123456789", false, nil, ErrPrecOutOfRange},
{"9999999999999999999", "1.0001", false, nil, nil},
{"-9999999999999999999.99999999999999", "9999999999999999999", false, nil, nil},
{"1234567890123456789", "1", false, nil, nil},
{"1234567890123456789", "2", false, nil, nil},
{"123456789012345678.9", "0.1", false, nil, nil},
{"1111111111111", "1111.1234567891234", false, nil, nil},
{"123456789", "1.12345678901234", false, nil, nil},
{"2345678901234567899", "1234567890123456789.12345678901234", false, nil, nil},
{"1000000000000000000000000.12345678901234", "-100000000000000000000", false, nil, nil},
{"0.12345678901234", "0.04586201546101", false, nil, nil},
{"1", "1111.1234567891234", false, nil, nil},
{"1", "1.1234567891234", false, nil, nil},
{"1", "2", false, nil, nil},
{"1", "3", false, nil, nil},
{"1", "4", false, nil, nil},
{"1", "5", false, nil, nil},
{"1234567890123456789.12345678901234", "1111.1789", false, nil, nil},
{"123456789123456789.123456789", "3.123456789", false, nil, nil},
{"123456789123456789.123456789", "3", false, nil, nil},
{"9999999999999999999", "1234567890123456789.12345678901234", false, nil, nil},
{"9999999999999999999.9999999999999", "1000000000000000000.12345678901234", false, nil, nil},
{"999999999999999999", "0.1000000001", false, nil, nil},
{"123456789123456789.123456789", "0", false, ErrDivideByZero, nil},
{"1000000000000", "0.0000001", false, nil, nil},
{"1234567890123456789.12345678901234", "0.00002", false, nil, nil},
{"1234567890123456789.12345678901234", "0.000000001", true, nil, nil},
{"1234567890123456789012345678901234567890.12345678901234", "1234567890123456789012345678901234567890.12345678901234", true, nil, nil},
{"1234567890123456789012345678901234567890.12345678901234", "-1234567890123456789012345678901234567890.12345678901234", true, nil, nil},
{"-1234567890123456789012345678901234567890.12345678901234", "1234567890123456789012345678901234567890.12345678901234", true, nil, nil},
{"-1234567890123456789012345678901234567890.12345678901234", "-1234567890123456789012345678901234567890.12345678901234", true, nil, nil},
}
for _, tc := range testcases {
t.Run(tc.a+"/"+tc.b, func(t *testing.T) {
a, err := Parse(tc.a)
if tc.parseErr != nil {
require.Equal(t, tc.parseErr, err)
return
}