bufio.UnreadRune: fix bug at EOF
Fixes #1132.
R=rsc
CC=golang-dev
https://golang.org/cl/2215045
diff --git a/src/pkg/bufio/bufio_test.go b/src/pkg/bufio/bufio_test.go
index 5df97bd..fb0ed04 100644
--- a/src/pkg/bufio/bufio_test.go
+++ b/src/pkg/bufio/bufio_test.go
@@ -319,6 +319,20 @@
}
}
+func TestUnreadRuneAtEOF(t *testing.T) {
+ // UnreadRune/ReadRune should error at EOF (was a bug; used to panic)
+ r := NewReader(strings.NewReader("x"))
+ r.ReadRune()
+ r.ReadRune()
+ r.UnreadRune()
+ _, _, err := r.ReadRune()
+ if err == nil {
+ t.Error("expected error at EOF")
+ } else if err != os.EOF {
+ t.Error("expected EOF; got", err)
+ }
+}
+
func TestReadWriteRune(t *testing.T) {
const NRune = 1000
byteBuf := new(bytes.Buffer)
