assertDoesNotThrow(() -> concreteImplementation.stripPathConsumed(0));
        }

        @Test
        @DisplayName("Should return next referral data")
        void testNext() {
            // Test with mock
            when(mockReferralData.next()).thenReturn(mockReferralData);
            DfsReferralDataInternal next = mockReferralData.next();
            assertSame(mockReferralData, next);

            assertEquals(second, third.next());
            assertEquals(referralData, second.next());
        }

        @Test
        @DisplayName("Should handle next() correctly")
        void testNext() {
            DfsReferralDataImpl second = new DfsReferralDataImpl();
            referralData.append(second);

            DfsReferralDataImpl next = referralData.next();
            assertSame(second, next);

	// utf8.RuneError.
	for _, r := range []rune{-1, utf8.MaxRune + 1} {
		var buf Buffer
		buf.WriteRune(r)
		check(t, fmt.Sprintf("TestWriteInvalidRune (%d)", r), &buf, "\uFFFD")
	}
}

func TestNext(t *testing.T) {
	b := []byte{0, 1, 2, 3, 4}
	tmp := make([]byte, 5)
	for i := 0; i <= 5; i++ {
		for j := i; j <= 5; j++ {
			for k := 0; k <= 6; k++ {
				// 0 <= i <= j <= 5; 0 <= k <= 6