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strconv: add tests that Java once mishandled

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Change-Id: I372233d8494665b3300f9a186c883a4254435e1c
Reviewed-on: https://go-review.googlesource.com/c/go/+/710617
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: David Chase <drchase@google.com>
This commit is contained in:
Russ Cox 2025-10-09 15:02:23 -04:00 • committed by David Chase
parent 9b8742f2e7
commit 9fdd6904da
1 changed files with 15 additions and 3 deletions
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18
src/strconv/ftoa_test.go
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@ -172,6 +172,11 @@ var ftoatests = []ftoaTest{
{3.999969482421875, 'x', 2, "0x1.00p+02"},
{3.999969482421875, 'x', 1, "0x1.0p+02"},
{3.999969482421875, 'x', 0, "0x1p+02"},
// Cases that Java once mishandled, from David Chase.
{1.801439850948199e+16, 'g', -1, "1.801439850948199e+16"},
{5.960464477539063e-08, 'g', -1, "5.960464477539063e-08"},
{1.012e-320, 'g', -1, "1.012e-320"},
}
func TestFtoa(t *testing.T) {
@ -186,13 +191,20 @@ func TestFtoa(t *testing.T) {
t.Error("AppendFloat testN=64", test.f, string(test.fmt), test.prec, "want", "abc"+test.s, "got", string(x))
}
if float64(float32(test.f)) == test.f && test.fmt != 'b' {
test_s := test.s
if test.f == 5.960464477539063e-08 {
// This test is an exact float32 but asking for float64 precision in the string.
// (All our other float64-only tests fail to exactness check above.)
test_s = "5.9604645e-08"
continue
}
s := FormatFloat(test.f, test.fmt, test.prec, 32)
if s != test.s {
t.Error("testN=32", test.f, string(test.fmt), test.prec, "want", test.s, "got", s)
t.Error("testN=32", test.f, string(test.fmt), test.prec, "want", test_s, "got", s)
}
x := AppendFloat([]byte("abc"), test.f, test.fmt, test.prec, 32)
if string(x) != "abc"+test.s {
t.Error("AppendFloat testN=32", test.f, string(test.fmt), test.prec, "want", "abc"+test.s, "got", string(x))
if string(x) != "abc"+test_s {
t.Error("AppendFloat testN=32", test.f, string(test.fmt), test.prec, "want", "abc"+test_s, "got", string(x))
}
}
}