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decimal64_test.go
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package decimal
import (
"math"
"strings"
"testing"
)
func TestNew64FromInt64(t *testing.T) {
t.Parallel()
for i := int64(0); i <= 1000; i++ {
replayOnFail(t, func() {
d := New64FromInt64(i)
j := d.Int64()
equal(t, i, j)
})
replayOnFail(t, func() {
d := New64FromInt64(-i)
j := d.Int64()
equal(t, -i, j)
})
}
// Test the neighborhood of powers of two up to the high-significand
// representation threshold.
for e := 4; e < 54; e++ {
base := int64(1) << uint(e)
for i := base - 10; i <= base+10; i++ {
replayOnFail(t, func() {
d := New64FromInt64(i)
j := d.Int64()
equal(t, i, j)
})
}
}
}
func TestNew64FromInt64Big(t *testing.T) {
t.Parallel()
const limit = int64(decimal64Base)
const step = limit / 997
for i := -int64(limit); i <= limit; i += step {
replayOnFail(t, func() {
d := New64FromInt64(i)
j := d.Int64()
equal(t, i, j)
})
}
}
func TestDecimal64Parse(t *testing.T) {
t.Parallel()
test := func(expected string, source string) {
t.Helper()
equal(t, strings.TrimSpace(expected), MustParse64(source).String())
}
test("0", "0")
test("1e-13", "0.0000000000001")
test("1e-13", "1e-13")
test("1", "1")
test("100000", "100000")
test("1e+6", "1000000")
}
func TestDecimal64ParseHalfEvenOdd(t *testing.T) {
t.Parallel()
ctx := Context64{Rounding: HalfEven}
test := func(expected string, source string) {
t.Helper()
equal(t, strings.TrimSpace(expected), ctx.MustParse(source).String())
}
test("1.000000000000007 ", "1.000000000000007")
test("1.000000000000007 ", "1.0000000000000074999999")
test("1.000000000000008 ", "1.0000000000000075000000")
test("1.000000000000008 ", "1.0000000000000075000001")
test("1.000000000000007e+11", "100000000000.0007")
test("1.000000000000007e+11", "100000000000.00074999999")
test("1.000000000000008e+11", "100000000000.00075000000")
test("1.000000000000008e+11", "100000000000.00075000001")
}
func TestDecimal64ParseHalfEvenEven(t *testing.T) {
t.Parallel()
ctx := Context64{Rounding: HalfEven}
test := func(expected string, source string) {
t.Helper()
equal(t, strings.TrimSpace(expected), ctx.MustParse(source).String())
}
test("1.000000000000008 ", "1.000000000000008")
test("1.000000000000008 ", "1.0000000000000084999999")
test("1.000000000000008 ", "1.0000000000000085000000")
test("1.000000000000009 ", "1.0000000000000085000001")
test("1.000000000000008e+11", "100000000000.0008")
test("1.000000000000008e+11", "100000000000.00084999999")
test("1.000000000000008e+11", "100000000000.00085000000")
test("1.000000000000009e+11", "100000000000.00085000001")
}
func TestDecimal64ParseHalfUp(t *testing.T) {
t.Parallel()
ctx := Context64{Rounding: HalfUp}
test := func(expected string, source string) {
t.Helper()
equal(t, strings.TrimSpace(expected), ctx.MustParse(source).String())
}
test("0", "0")
test("1e-13", "0.0000000000001")
test("1e-13", "1e-13")
test("1", "1")
test("100000", "100000")
test("1e+6", "1000000")
test("1.49999999999999 ", "1.49999999999999")
test("1.499999999999999", "1.499999999999999")
test("1.499999999999999", "1.4999999999999994999999")
test("1.5 ", "1.4999999999999995000000")
test("1.5 ", "1.4999999999999995000001")
test("1.99999999999949 ", "1.99999999999949")
test("1.999999999999499", "1.999999999999499")
test("1.999999999999499", "1.9999999999994994999999")
test("1.9999999999995 ", "1.9999999999994995000000")
test("1.9999999999995 ", "1.9999999999994995000001")
test("1.99999999999994 ", "1.99999999999994")
test("1.999999999999949", "1.999999999999949")
test("1.999999999999949", "1.9999999999999494999999")
test("1.99999999999995 ", "1.9999999999999495000000")
test("1.99999999999995 ", "1.9999999999999495000001")
test("10.4999999999999 ", "10.4999999999999")
test("10.49999999999999", "10.49999999999999")
test("10.49999999999999", "10.499999999999994999999")
test("10.5 ", "10.499999999999995000000")
test("10.5 ", "10.499999999999995000001")
test("1.00000000000499e+11 ", "100000000000.499")
test("1.000000000004999e+11", "100000000000.4999")
test("1.000000000005e+11 ", "100000000000.49999")
}
func TestDecimal64ParseDown(t *testing.T) {
t.Parallel()
ctx := Context64{Rounding: Down}
test := func(expected string, source string) {
t.Helper()
equal(t, strings.TrimSpace(expected), ctx.MustParse(source).String())
}
test("0", "0")
test("1e-13", "0.0000000000001")
test("1e-13", "1e-13")
test("1", "1")
test("100000", "100000")
test("1e+6", "1000000")
test("1.49999999999999 ", "1.49999999999999")
test("1.499999999999999", "1.499999999999999")
test("1.499999999999999", "1.4999999999999994999999")
test("1.499999999999999", "1.4999999999999995000000")
test("1.499999999999999", "1.4999999999999995000001")
test("1.99999999999949 ", "1.99999999999949")
test("1.999999999999499", "1.999999999999499")
test("1.999999999999499", "1.9999999999994994999999")
test("1.999999999999499", "1.9999999999994995000000")
test("1.999999999999499", "1.9999999999994995000001")
test("1.99999999999994 ", "1.99999999999994")
test("1.999999999999949", "1.999999999999949")
test("1.999999999999949", "1.9999999999999494999999")
test("1.999999999999949", "1.9999999999999495000000")
test("1.999999999999949", "1.9999999999999495000001")
test("10.4999999999999 ", "10.4999999999999")
test("10.49999999999999", "10.49999999999999")
test("10.49999999999999", "10.499999999999994999999")
test("10.49999999999999", "10.499999999999995000000")
test("10.49999999999999", "10.499999999999995000001")
test("1.00000000000499e+11 ", "100000000000.499")
test("1.000000000004999e+11", "100000000000.4999")
test("1.000000000004999e+11", "100000000000.49999")
}
func TestDecimal64Float64(t *testing.T) {
t.Parallel()
equal(t, -1.0, NegOne64.Float64())
equal(t, 0.0, Zero64.Float64())
equal(t, 1.0, One64.Float64())
equal(t, 10.0, New64FromInt64(10).Float64())
oneThird := One64.Quo(New64FromInt64(3))
one := oneThird.Add(oneThird).Add(oneThird)
epsilon(t, oneThird.Float64(), 1.0/3.0)
epsilon(t, 1.0, one.Float64())
check(t, math.IsNaN(QNaN64.Float64()))
panics(t, func() { SNaN64.Float64() })
equal(t, math.Inf(1), Infinity64.Float64())
equal(t, math.Inf(-1), NegInfinity64.Float64())
}
func TestDecimal64Int64(t *testing.T) {
t.Parallel()
equal(t, -1, NegOne64.Int64())
equal(t, 0, Zero64.Int64())
equal(t, -0, NegZero64.Int64())
equal(t, 1, One64.Int64())
equal(t, 10, New64FromInt64(10).Int64())
equal(t, 0, QNaN64.Int64())
equal(t, int64(math.MaxInt64), Infinity64.Int64())
equal(t, int64(math.MinInt64), NegInfinity64.Int64())
equal(t, int64(math.MaxInt64), MustParse64("1e100").Int64())
equal(t, int64(math.MaxInt64), MustParse64("91234567890123456789e20").Int64())
}
func TestDecimal64IsInf(t *testing.T) {
t.Parallel()
check(t, Infinity64.IsInf())
check(t, NegInfinity64.IsInf())
check(t, !Zero64.IsInf())
check(t, !NegZero64.IsInf())
check(t, !QNaN64.IsInf())
check(t, !SNaN64.IsInf())
check(t, !New64FromInt64(42).IsInf())
check(t, !New64FromInt64(-42).IsInf())
}
func TestDecimal64IsNaN(t *testing.T) {
t.Parallel()
check(t, QNaN64.IsNaN())
check(t, SNaN64.IsNaN())
check(t, QNaN64.IsQNaN())
check(t, !SNaN64.IsQNaN())
check(t, !QNaN64.IsSNaN())
check(t, SNaN64.IsSNaN())
notNaN := func(n Decimal64) {
check(t, !n.IsNaN())
check(t, !n.IsQNaN())
check(t, !n.IsSNaN())
}
notNaN(Infinity64)
notNaN(NegInfinity64)
notNaN(Zero64)
notNaN(NegZero64)
notNaN(New64FromInt64(42))
notNaN(New64FromInt64(-42))
}
func TestDecimal64IsInt(t *testing.T) {
t.Parallel()
fortyTwo := New64FromInt64(42)
check(t, Zero64.IsInt())
check(t, fortyTwo.IsInt())
check(t, fortyTwo.Mul(fortyTwo).IsInt())
check(t, fortyTwo.Quo(fortyTwo).IsInt())
check(t, !One64.Quo(fortyTwo).IsInt())
check(t, !Infinity64.IsInt())
check(t, !NegInfinity64.IsInt())
check(t, !QNaN64.IsInt())
check(t, !SNaN64.IsInt())
}
func TestDecimal64Sign(t *testing.T) {
t.Parallel()
equal(t, 0, Zero64.Sign())
equal(t, 0, NegZero64.Sign())
equal(t, 1, One64.Sign())
equal(t, -1, NegOne64.Sign())
}
func TestDecimal64Signbit(t *testing.T) {
t.Parallel()
check(t, !Zero64.Signbit())
check(t, NegZero64.Signbit())
check(t, !One64.Signbit())
check(t, NegOne64.Signbit())
}
func TestDecimal64isZero(t *testing.T) {
t.Parallel()
check(t, Zero64.IsZero())
check(t, NegZero64.IsZero())
check(t, !One64.IsZero())
}
func TestIsSubnormal(t *testing.T) {
t.Parallel()
check(t, MustParse64("0.1E-383").IsSubnormal())
check(t, MustParse64("-0.1E-383").IsSubnormal())
check(t, !MustParse64("NaN10").IsSubnormal())
check(t, !New64FromInt64(42).IsSubnormal())
}