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fmt: add test of NaN map keys

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R=r
CC=golang-dev
https://golang.org/cl/5564063
This commit is contained in:
Russ Cox 2012-01-30 13:20:38 -05:00
parent f3492a7d40
commit e451fb8ffb
1 changed files with 8 additions and 0 deletions
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8
src/pkg/fmt/fmt_test.go
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@ -443,6 +443,14 @@ var fmttests = []struct {
{"%s", nil, "%!s(<nil>)"}, {"%s", nil, "%!s(<nil>)"},
{"%T", nil, "<nil>"}, {"%T", nil, "<nil>"},
{"%-1", 100, "%!(NOVERB)%!(EXTRA int=100)"}, {"%-1", 100, "%!(NOVERB)%!(EXTRA int=100)"},
// The "<nil>" show up because maps are printed by
// first obtaining a list of keys and then looking up
// each key. Since NaNs can be map keys but cannot
// be fetched directly, the lookup fails and returns a
// zero reflect.Value, which formats as <nil>.
// This test is just to check that it shows the two NaNs at all.
{"%v", map[float64]int{math.NaN(): 1, math.NaN(): 2}, "map[NaN:<nil> NaN:<nil>]"},
} }
func TestSprintf(t *testing.T) { func TestSprintf(t *testing.T) {