Set<List<Integer>> actual = cartesianProduct(set(1, 2), set(3, 4));
    assertTrue(actual.contains(list(1, 3)));
    assertTrue(actual.contains(list(1, 4)));
    assertTrue(actual.contains(list(2, 3)));
    assertTrue(actual.contains(list(2, 4)));
    assertFalse(actual.contains(list(3, 1)));
  }

  public void testCartesianProduct_equals() {

    @Test
    @DisplayName("happy: toString contains class info and field values")
    void testToStringContainsAllInfo() {
        int fid = 256;
        long lwt = 9876543210L;
        SmbComClose close = new SmbComClose(fid, lwt);
        String s = close.toString();
        assertTrue(s.startsWith("SmbComClose["), "string should start with class name");
        assertTrue(s.contains("fid=" + fid), "string should contain the fid value");

        // Verify the key parts of the string representation
        assertTrue(result.startsWith("NetServerEnum2["));
        assertTrue(result.contains("command=SMB_COM_TRANSACTION"));
        assertTrue(result.contains(",name=\\PIPE\\LANMAN"));
        assertTrue(result.contains(",serverTypes=SV_TYPE_ALL]"));
    }

    /**
     * Test the toString method with SV_TYPE_DOMAIN_ENUM.
     */
    @Test

    assertFalse(set.contains(0));
    assertTrue(set.contains(1));
    assertTrue(set.contains(2));
    assertTrue(set.contains(3));
    assertFalse(set.contains(4));
    set = ContiguousSet.create(Range.open(0, 4), integers());
    assertFalse(set.contains(0));
    assertTrue(set.contains(1));
    assertTrue(set.contains(2));
    assertTrue(set.contains(3));
    assertFalse(set.contains(4));
  }

        assertEquals("1", true, StringUtil.contains("a", 'a'));
        assertEquals("2", true, StringUtil.contains("abc", 'b'));
        assertEquals("3", false, StringUtil.contains("abc", 'd'));
    }

    /**
     * @throws Exception
     */
    @Test
    public void testContains2() throws Exception {
        assertEquals("1", true, StringUtil.contains("a", "a"));

        // Act
        String result = nodeStatusRequest.toString();

        // Assert
        assertTrue(result.contains("NodeStatusRequest"));
        assertTrue(result.contains("nameTrnId=12345"));
        assertTrue(result.contains("TESTNAME"));
    }

    @Test
    void toString_withNullQuestionName_shouldHandleGracefully() {
        // Arrange

  }

  /**
   * Returns {@code true} if {@code iterable} contains any element {@code o} for which {@code
   * Objects.equals(o, element)} would return {@code true}. Otherwise returns {@code false}, even in
   * cases where {@link Collection#contains} might throw {@link NullPointerException} or {@link
   * ClassCastException}.
   */
  public static boolean contains(Iterable<?> iterable, @Nullable Object element) {

        String normalized = validator.validateSmbUrl(url);
        assertTrue(normalized.startsWith("smb://"));
        assertTrue(normalized.contains("server"));
        assertTrue(normalized.contains("/share/folder/file.txt") || normalized.contains("\\share\\folder\\file.txt"));
    }

    @Test
    public void testSmbUrlWithCredentials() throws Exception {
        String url = "smb://user:pass@server/share";

            assertFalse("Command should not contain ${url}", cmd.contains("${url}"));
            assertFalse("Command should not contain ${outputFile}", cmd.contains("${outputFile}"));
            assertTrue("Command should contain temp path", cmd.contains(tempPath));
            assertTrue("Command should contain output path", cmd.contains(outputPath));
        }
    }

    // Test timeout scenarios

        tree.connectionState = 2;

        String result = tree.toString();
        // Verify the toString contains the expected information
        assertTrue(result.contains("TESTSHARE"));
        assertTrue(result.contains("testService"));
        assertTrue(result.contains("123"));
        assertTrue(result.contains("2"));
    }

    @Test
    void testTreeConnectAndDisconnect() throws Exception {