return
		}
		if err != e.err {
			t.Errorf("%q call %d, err == %v, want %v", input, i, err, e.err)
			return
		}
	}
}

func createTestInput(n int) []byte {
	input := make([]byte, n)
	for i := range input {
		// 101 and 251 are arbitrary prime numbers.
		// The idea is to create an input sequence
		// which doesn't repeat too frequently.