}
	w.Flush()
	if got, want := buf.String(), "0123abcd"; got != want {
		t.Fatalf("buf.Bytes() returned %q, want %q", got, want)
	}
}

func TestWriterReadFromErrNoProgress(t *testing.T) {
	buf := new(bytes.Buffer)
	w := NewWriterSize(buf, 5)

	// Partially fill buffer
	n, err := w.Write([]byte("0123"))
	if n != 4 || err != nil {