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strconv: add tests for issue 2917

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Cannot reproduce the failure locally,
but add explicit test in case some other
machine can.

Fixes #2917 (for now).

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5651071
This commit is contained in:
Russ Cox 2012-02-12 23:24:54 -05:00
parent daa7bd8ec6
commit f7a3683928
1 changed files with 34 additions and 0 deletions
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34
src/pkg/strconv/atof_test.go
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@ -226,6 +226,40 @@ func TestAtofRandom(t *testing.T) {
t.Logf("tested %d random numbers", len(atofRandomTests))
}
var roundTripCases = []struct {
f float64
s string
}{
// Issue 2917.
// A Darwin/386 builder failed on AtofRandom with this case.
{8865794286000691 << 39, "4.87402195346389e+27"},
{8865794286000692 << 39, "4.8740219534638903e+27"},
}
func TestRoundTrip(t *testing.T) {
for _, tt := range roundTripCases {
old := SetOptimize(false)
s := FormatFloat(tt.f, 'g', -1, 64)
if s != tt.s {
t.Errorf("no-opt FormatFloat(%b) = %s, want %s", tt.f, s, tt.s)
}
f, err := ParseFloat(tt.s, 64)
if f != tt.f || err != nil {
t.Errorf("no-opt ParseFloat(%s) = %b, %v want %b, nil", tt.s, f, err, tt.f)
}
SetOptimize(true)
s = FormatFloat(tt.f, 'g', -1, 64)
if s != tt.s {
t.Errorf("opt FormatFloat(%b) = %s, want %s", tt.f, s, tt.s)
}
f, err = ParseFloat(tt.s, 64)
if f != tt.f || err != nil {
t.Errorf("opt ParseFloat(%s) = %b, %v want %b, nil", tt.s, f, err, tt.f)
}
SetOptimize(old)
}
}
func BenchmarkAtof64Decimal(b *testing.B) {
for i := 0; i < b.N; i++ {
ParseFloat("33909", 64)