Stowage/go
2
0
Fork 0
mirror of https://github.com/golang/go.git synced 2025-12-08 06:10:04 +00:00
Code Issues Projects Releases Packages Wiki Activity

bytes: clarify documentation for UnreadByte/Rune

Browse source 
Fixes #19522.

Change-Id: Ib3cf0336e0bf91580d533704ec1a9d45eb0bf62d
Reviewed-on: https://go-review.googlesource.com/42020
Reviewed-by: Rob Pike <r@golang.org>
This commit is contained in:
Robert Griesemer 2017-04-27 16:55:47 -07:00
parent 85d6a29ae6
commit 86cfe93515
2 changed files with 45 additions and 12 deletions
Download patch file Download diff file Expand all files Collapse all files

44
src/bytes/buffer_test.go
View file

@ -311,6 +311,19 @@ func TestRuneIO(t *testing.T) {
// Check that UnreadRune works
buf.Reset()
// check at EOF
if err := buf.UnreadRune(); err == nil {
t.Fatal("UnreadRune at EOF: got no error")
}
if _, _, err := buf.ReadRune(); err == nil {
t.Fatal("ReadRune at EOF: got no error")
}
if err := buf.UnreadRune(); err == nil {
t.Fatal("UnreadRune after ReadRune at EOF: got no error")
}
// check not at EOF
buf.Write(b)
for r := rune(0); r < NRune; r++ {
r1, size, _ := buf.ReadRune()
@ -473,15 +486,34 @@ func TestReadEmptyAtEOF(t *testing.T) {
func TestUnreadByte(t *testing.T) {
b := new(Buffer)
b.WriteString("abcdefghijklmnopqrstuvwxyz")
_, err := b.ReadBytes('m')
if err != nil {
t.Fatalf("ReadBytes: %v", err)
// check at EOF
if err := b.UnreadByte(); err == nil {
t.Fatal("UnreadByte at EOF: got no error")
}
if _, err := b.ReadByte(); err == nil {
t.Fatal("ReadByte at EOF: got no error")
}
if err := b.UnreadByte(); err == nil {
t.Fatal("UnreadByte after ReadByte at EOF: got no error")
}
err = b.UnreadByte()
if err != nil {
// check not at EOF
b.WriteString("abcdefghijklmnopqrstuvwxyz")
// after unsuccessful read
if n, err := b.Read(nil); n != 0 || err != nil {
t.Fatalf("Read(nil) = %d,%v; want 0,nil", n, err)
}
if err := b.UnreadByte(); err == nil {
t.Fatal("UnreadByte after Read(nil): got no error")
}
// after successful read
if _, err := b.ReadBytes('m'); err != nil {
t.Fatalf("ReadBytes: %v", err)
}
if err := b.UnreadByte(); err != nil {
t.Fatalf("UnreadByte: %v", err)
}
c, err := b.ReadByte()