}
	})

	t.Run("Persistence", func(t *testing.T) {
		tw := NewWriter(new(failOnceWriter))
		if err := tw.WriteHeader(&Header{}); err != io.ErrShortWrite {
			t.Fatalf("WriteHeader() = %v, want %v", err, io.ErrShortWrite)
		}
		if err := tw.WriteHeader(&Header{Name: "small.txt"}); err == nil {
			t.Errorf("WriteHeader() = got %v, want non-nil error", err)
		}
		if _, err := tw.Write(nil); err == nil {