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bytes: fix UnreadByte failure after ReadBytes

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Fixes #4583.

R=golang-dev, minux.ma, bradfitz, rsc, dave
CC=golang-dev
https://golang.org/cl/6976050
This commit is contained in:
Stéphane Travostino 2013-01-11 17:02:21 +11:00 • committed by Dave Cheney
parent 9ae7f34084
commit 53e342f648
2 changed files with 24 additions and 1 deletions
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22
src/pkg/bytes/buffer_test.go
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@ -453,3 +453,25 @@ func TestReadEmptyAtEOF(t *testing.T) {
t.Errorf("wrong count; got %d want 0", n)
}
}
func TestUnreadByte(t *testing.T) {
b := new(Buffer)
b.WriteString("abcdefghijklmnopqrstuvwxyz")
_, err := b.ReadBytes('m')
if err != nil {
t.Fatalf("ReadBytes: %v", err)
}
err = b.UnreadByte()
if err != nil {
t.Fatalf("UnreadByte: %v", err)
}
c, err := b.ReadByte()
if err != nil {
t.Fatalf("ReadByte: %v", err)
}
if c != 'm' {
t.Errorf("ReadByte = %q; want %q", c, 'm')
}
}