PosixTest.AppendMode
parent
b8ea62986f
commit
b814416bb2
|
@ -218,6 +218,52 @@ func (t *PosixTest) WriteAtDoesntChangeOffset_AppendMode() {
|
|||
ExpectEq(4, offset)
|
||||
}
|
||||
|
||||
func (t *PosixTest) AppendMode() {
|
||||
var err error
|
||||
var n int
|
||||
var off int64
|
||||
buf := make([]byte, 1024)
|
||||
|
||||
// Create a file with some contents.
|
||||
fileName := path.Join(t.dir, "foo")
|
||||
err = ioutil.WriteFile(fileName, []byte("Jello, "), 0600)
|
||||
AssertEq(nil, err)
|
||||
|
||||
// Open the file in append mode.
|
||||
f, err := os.OpenFile(fileName, os.O_RDWR|os.O_APPEND, 0600)
|
||||
t.toClose = append(t.toClose, f)
|
||||
AssertEq(nil, err)
|
||||
|
||||
// Seek to somewhere silly and then write.
|
||||
off, err = f.Seek(2, 0)
|
||||
AssertEq(nil, err)
|
||||
AssertEq(2, off)
|
||||
|
||||
n, err = f.Write([]byte("world!"))
|
||||
AssertEq(nil, err)
|
||||
AssertEq(6, n)
|
||||
|
||||
// The offset should have been updated to point at the end of the file.
|
||||
off, err = getFileOffset(f)
|
||||
AssertEq(nil, err)
|
||||
ExpectEq(13, off)
|
||||
|
||||
// A random write should still work, without updating the offset.
|
||||
n, err = f.WriteAt([]byte("H"), 0)
|
||||
AssertEq(nil, err)
|
||||
AssertEq(1, n)
|
||||
|
||||
off, err = getFileOffset(f)
|
||||
AssertEq(nil, err)
|
||||
ExpectEq(13, off)
|
||||
|
||||
// Read back the contents of the file, which should be correct even though we
|
||||
// seeked to a silly place before writing the world part.
|
||||
n, err = f.ReadAt(buf, 0)
|
||||
AssertEq(io.EOF, err)
|
||||
ExpectEq("Hello, world!", string(buf[:n]))
|
||||
}
|
||||
|
||||
func (t *PosixTest) ReadsPastEndOfFile() {
|
||||
var err error
|
||||
var n int
|
||||
|
|
Loading…
Reference in New Issue