func testReadAt(t *testing.T, s *stream.Stream, off int64, want_err error, want string) {
var (
err error
msg string
buf = []byte("......")
str string
)
msg = fmt.Sprintf("ReadAt([<%d>], %d),", len(buf), off)
_, err = s.ReadAt(buf, off)
if err != want_err {
t.Errorf("%s want error `%v`, but got `%v`\n", msg, want_err, err)
return
}
str = string(buf)
if str != want {
t.Errorf("%s got `%s`, want `%s`\n", msg, str, want)
}
}
