assertWithMessage("%s not found in exception text: %s", value, ex.getMessage())
          .that(ex.getMessage().contains(String.valueOf(value)))
          .isTrue();
    }
  }

  public void testCompare() {
    for (byte x : VALUES) {
      for (byte y : VALUES) {
        // Only compare the sign of the result of compare().
        int expected = Byte.compare(x, y);
        int actual = SignedBytes.compare(x, y);

	{[]byte("abcdefghj"), []byte("abcdefghi"), 1},
	// nil tests
	{nil, nil, 0},
	{[]byte(""), nil, 0},
	{nil, []byte(""), 0},
	{[]byte("a"), nil, 1},
	{nil, []byte("a"), -1},
}

func TestCompare(t *testing.T) {
	for _, tt := range compareTests {
		numShifts := 16
		buffer := make([]byte, len(tt.b)+numShifts)
		// vary the input alignment of tt.b
		for offset := 0; offset <= numShifts; offset++ {