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decimal64fmt_test.go
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decimal64fmt_test.go
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package decimal
import (
"fmt"
"strconv"
"strings"
"testing"
)
func Test64PrecScal(t *testing.T) {
t.Parallel()
test := func(s string, prec int) {
t.Helper()
expected := MustParse64(s)
actual := new64(precScale(prec).bits)
equal(t, expected, actual)
}
test("1", 0)
test("0.1", 1)
test("0.01", 2)
test("0.001", 3)
test("0.0001", 4)
}
func TestDecimal64String(t *testing.T) {
t.Parallel()
equal(t, strconv.Itoa(0), New64FromInt64(0).String())
for i := int64(-1000); i <= 1000; i++ {
equal(t, strconv.Itoa(int(i)), New64FromInt64(i).String())
}
for f := 1; f < 1000; f += 11 {
fdigits := strings.TrimRight(fmt.Sprintf("%03d", f), "0")
fraction := New64FromInt64(int64(f)).Quo(New64FromInt64(1000))
for i := int64(0); i <= 100; i++ {
nopanic(t, func() {
equal(t,
strconv.Itoa(int(i))+"."+fdigits,
New64FromInt64(i).Add(fraction).String(),
)
})
}
for i := int64(-100); i < 0; i++ {
nopanic(t, func() {
equal(t,
strconv.Itoa(int(i))+"."+fdigits,
New64FromInt64(i).Sub(fraction).String(),
)
})
}
}
}
func TestDecimal64StringEdgeCases(t *testing.T) {
t.Parallel()
test := func(expected, source string) {
t.Helper()
equal(t, strings.TrimSpace(expected), MustParse64(strings.TrimSpace(source)).String())
}
test(" 123456", "123456")
test("-123456", "-123456")
test(" 1.234567e+6", "1234567")
test("-1.234567e+6", "-1234567")
test(" 0.0001", "0.0001")
test("-0.0001", "-0.0001")
test(" 1e-5", "0.00001")
test("-1e-5", "-0.00001")
test(" 9.999999999999999e+384", "9.999999999999999e+384")
test("-9.999999999999999e+384", "-9.999999999999999e+384")
test(" 1e-398", " 1e-398")
test("-1e-398", "-1e-398")
// regression for prefix-zeros-after-dot bug
test(" 1.666666666666667", " 1.666666666666667")
test("0.01666666666666667", "0.01666666666666667")
}
// Non-representative sample, but retained for comparison purposes.
func BenchmarkIODecimal64String(b *testing.B) {
d := New64FromInt64(123456789)
for i := 0; i <= b.N; i++ {
_ = d.String()
}
}
func BenchmarkIODecimal64String2(b *testing.B) {
dd := []Decimal64{
Zero64,
Pi64,
New64FromInt64(123456789),
MustParse64("-12345678901234E-380"),
MustParse64("+12345678901234E+380"),
QNaN64,
Infinity64,
}
for i := 0; i <= b.N; i++ {
_ = dd[i%len(dd)].String()
}
}
func TestDecimal64Format(t *testing.T) {
t.Parallel()
for i := int64(-1000); i <= 1000; i++ {
equal(t, strconv.FormatInt(i, 10), fmt.Sprintf("%v", New64FromInt64(i)))
}
equal(t, "42", New64FromInt64(42).String())
}
func TestDecimal64FormatNaN(t *testing.T) {
t.Parallel()
n := MustParse64("-sNaN33")
equal(t, "-NaN33", n.String())
}
func TestDecimal64FormatPrec(t *testing.T) {
t.Parallel()
pi := MustParse64("3.1415926535897932384626433")
test := func(expected string, prec int, n Decimal64) {
t.Helper()
var buf [32]byte
actual := string(DefaultFormatContext64.append(n, buf[:0], -1, prec, noFlags, 'f'))
equal(t, expected, actual)
equal(t, expected, fmt.Sprintf("%.*f", prec, n))
equal(t, expected, n.Text('f', prec))
}
equal(t, "3.141592653589793", pi.String())
equal(t, "3.141592653589793", Context64{Rounding: HalfEven}.With(pi).String())
equal(t, "3.141592653589793", Context64{Rounding: HalfUp}.With(pi).String())
equal(t, "3.141592653589793", fmt.Sprintf("%v", pi))
equal(t, "3.141593", fmt.Sprintf("%f", pi))
equal(t, "%!q(decimal.Decimal64=3.141592653589793)", fmt.Sprintf("%q", pi))
test("3", 0, pi)
test("3.1", 1, pi)
test("3.14", 2, pi)
test("3.142", 3, pi)
test("3.141593", 6, pi)
test("3.141592654", 9, pi)
test("3.1415926536", 10, pi)
test("3.141592653589793", 15, pi)
test("3.14159265358979300000", 20, pi)
test("3.1415926535897930"+strings.Repeat("0", 64), 80, pi)
test("3.1415926535897930"+strings.Repeat("0", 100), 116, pi)
pi = pi.Add(New64FromInt64(100))
equal(t, "103.1415926535898", fmt.Sprintf("%v", pi))
equal(t, "103.141593", fmt.Sprintf("%f", pi))
test("103", 0, pi)
test("103.1", 1, pi)
test("103.14", 2, pi)
test("103.142", 3, pi)
test("103.141593", 6, pi)
test("103.141592654", 9, pi)
test("103.1415926536", 10, pi)
test("103.141592653589800", 15, pi)
test("103.14159265358980000000", 20, pi)
test("103.1415926535898000"+strings.Repeat("0", 64), 80, pi)
test("103.1415926535898000"+strings.Repeat("0", 100), 116, pi)
pi = pi.Add(New64FromInt64(100_000))
equal(t, "100103.1415926536", fmt.Sprintf("%v", pi))
equal(t, "100103.141593", fmt.Sprintf("%f", pi))
test("100103", 0, pi)
test("100103.1", 1, pi)
test("100103.14", 2, pi)
test("100103.142", 3, pi)
test("100103.141593", 6, pi)
test("100103.141592654", 9, pi)
test("100103.1415926536", 10, pi)
test("100103.141592653600000", 15, pi)
test("100103.14159265360000000000", 20, pi)
test("100103.1415926536000000"+strings.Repeat("0", 64), 80, pi)
test("100103.1415926536000000"+strings.Repeat("0", 100), 116, pi)
// // Add five digits to the significand so that we round at a 2.
pi = pi.Add(New64FromInt64(10_100_000_000))
equal(t, "1.010010010314159e+10", fmt.Sprintf("%v", pi))
equal(t, "10100100103.141590", fmt.Sprintf("%f", pi))
test("10100100103", 0, pi)
test("10100100103.1", 1, pi)
test("10100100103.14", 2, pi)
test("10100100103.142", 3, pi)
test("10100100103.141590", 6, pi)
test("10100100103.141590000", 9, pi)
test("10100100103.1415900000", 10, pi)
test("10100100103.141590000000000", 15, pi)
test("10100100103.14159000000000000000", 20, pi)
test("10100100103.1415900000000000"+strings.Repeat("0", 64), 80, pi)
test("10100100103.1415900000000000"+strings.Repeat("0", 100), 116, pi)
}
func TestDecimal64FormatPrecEdgeCases(t *testing.T) {
t.Parallel()
test := func(expected, input string) {
n, err := Parse64(input)
isnil(t, err)
equal(t, expected, fmt.Sprintf("%.3f", n))
}
test("0.062", "0.0625")
test("0.063", "0.062500001")
test("0.062", "0.0625000000000000000000000000000000001")
test("-0.062", "-0.0625")
test("-0.063", "-0.062500001")
test("-0.062", "-0.0625000000000000000000000000000000001")
test("0.188", "0.1875")
test("0.188", "0.187500001")
test("0.188", "0.1875000000000000000000000000000000001")
test("-0.188", "-0.1875")
test("-0.188", "-0.187500001")
test("-0.188", "-0.1875000000000000000000000000000000001")
}
func TestDecimal64FormatPrecEdgeCasesHalfUp(t *testing.T) {
t.Parallel()
ctx := Context64{Rounding: HalfUp}
test := func(expected, input string) {
n, err := Parse64(input)
isnil(t, err)
equal(t, expected, ctx.With(n).Text('f', -1, 3))
equal(t, expected, fmt.Sprintf("%.3f", ctx.With(n)))
}
test("0.063", "0.0625")
test("0.063", "0.062500001")
test("0.063", "0.0625000000000000000000000000000000001")
test("-0.063", "-0.0625")
test("-0.063", "-0.062500001")
test("-0.063", "-0.0625000000000000000000000000000000001")
test("0.188", "0.1875")
test("0.188", "0.187500001")
test("0.188", "0.1875000000000000000000000000000000001")
test("-0.188", "-0.1875")
test("-0.188", "-0.187500001")
test("-0.188", "-0.1875000000000000000000000000000000001")
}
func TestDecimal64FormatPrecEdgeCases2(t *testing.T) {
t.Parallel()
test := func(expected string, input Decimal64, prec int) {
t.Helper()
data := input.Append(nil, 'f', prec)
equal(t, expected, string(data))
}
test("10000.0000000000", MustParse64("1e4"), 10)
test("10000000000.0000000000", MustParse64("1e10"), 10)
test("100000000000.0000000000", MustParse64("1e11"), 10)
test("100000000000000000000000000000000000000000000000000.0000000000", MustParse64("1e50"), 10)
test("0.0001000000", MustParse64("1e-4"), 10)
test("0.0000000001", MustParse64("1e-10"), 10)
test("0.0000000000", MustParse64("1e-11"), 10)
test("0.0000000000", MustParse64("1e-20"), 10)
test("0.0000000000", MustParse64("1e-30"), 10)
test("0.000000000000000000000000000001", MustParse64("1e-30"), 30)
test("0.0000000000", Zero64, 10)
test("-0.0000000000", Zero64.NextMinus(), 10)
test("0.0000000000", Zero64.NextPlus(), 10)
test("inf", Infinity64, 10)
test("9999999999999999000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000.0000000000", Infinity64.NextMinus(), 10)
test("inf", Infinity64.NextPlus(), 10)
test("-10000.0000000000", MustParse64("-1e4"), 10)
test("-10000000000.0000000000", MustParse64("-1e10"), 10)
test("-100000000000.0000000000", MustParse64("-1e11"), 10)
test("-100000000000000000000000000000000000000000000000000.0000000000", MustParse64("-1e50"), 10)
test("-0.0001000000", MustParse64("-1e-4"), 10)
test("-0.0000000001", MustParse64("-1e-10"), 10)
test("-0.0000000000", MustParse64("-1e-11"), 10)
test("-0.0000000000", MustParse64("-1e-20"), 10)
test("-0.0000000000", MustParse64("-1e-30"), 10)
test("-0.000000000000000000000000000001", MustParse64("-1e-30"), 30)
test("-0.0000000000", NegZero64, 10)
test("-0.0000000000", Zero64.NextMinus(), 10)
test("0.0000000000", Zero64.NextPlus(), 10)
test("-inf", NegInfinity64, 10)
test("-inf", NegInfinity64.NextMinus(), 10)
test("-9999999999999999000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000.0000000000", NegInfinity64.NextPlus(), 10)
}
func TestDecimal64Format2(t *testing.T) {
t.Parallel()
a := MustParse64("0.0001643835616")
equal(t, "0.000164383562", fmt.Sprintf("%.12f", a))
b := New64FromInt64(600).Quo(New64FromInt64(10000))
b = b.Quo(New64FromInt64(365))
equal(t, "0.000164383562", fmt.Sprintf("%.12f", b))
}
func BenchmarkIODecimal64Format(b *testing.B) {
d := New64FromInt64(123456789)
for i := 0; i <= b.N; i++ {
_ = fmt.Sprintf("%v", d)
}
}
func TestDecimal64Append(t *testing.T) {
t.Parallel()
assertAppend := func(expected string, d Decimal64, format byte, prec int) {
equal(t, expected, string(d.Append([]byte{}, format, prec)))
}
for i := int64(-1000); i <= 1000; i++ {
d := New64FromInt64(i)
f := d.Append([]byte{}, 'g', 0)
equal(t, strconv.FormatInt(i, 10), string(f))
}
assertAppend("NaN", QNaN64, 'g', 0)
assertAppend("inf", Infinity64, 'g', 0)
assertAppend("-inf", NegInfinity64, 'g', 0)
assertAppend("-0", NegZero64, 'g', 0)
assertAppend("NaN", QNaN64, 'f', 0)
assertAppend("NaN", SNaN64, 'f', 0)
assertAppend("inf", Infinity64, 'f', 0)
assertAppend("-inf", NegInfinity64, 'f', 0)
assertAppend("%w", Zero64, 'w', 0)
assertAppend("1.23456789e+8", MustParse64("123456789"), 'e', 0)
assertAppend("1.23456789e+18", MustParse64("123456789e10"), 'e', 0)
assertAppend("1.23456789e-18", MustParse64("123456789e-26"), 'e', 0)
assertAppend("1234567890000000000", MustParse64("123456789e10"), 'f', 0)
assertAppend("123456789", MustParse64("123456789"), 'g', 0)
assertAppend("1.23456789e+18", MustParse64("123456789e10"), 'g', 0)
assertAppend("1.23456789e-18", MustParse64("123456789e-26"), 'g', 0)
assertAppend("1.23456789e+18", MustParse64("123456789e10"), 'g', 0)
}
func BenchmarkIODecimal64Append(b *testing.B) {
d := New64FromInt64(123456789)
var buf [32]byte
for i := 0; i <= b.N; i++ {
_ = d.Append(buf[:0], 'g', 0)
}
}