assertNull(navigableMap.floorKey(k0()));
    assertNull(navigableMap.ceilingEntry(k0()));
    assertNull(navigableMap.ceilingKey(k0()));
    assertNull(navigableMap.higherEntry(k0()));
    assertNull(navigableMap.higherKey(k0()));
  }

  @CollectionSize.Require(ZERO)
  public void testEmptyMapLast() {
    assertNull(navigableMap.lastEntry());
  }

  @MapFeature.Require(SUPPORTS_REMOVE)

        testFessConfig.ldapAdminSyncPassword = false;

        boolean result = ldapChain.changePassword(null, null);

        assertTrue(result);
        assertNull(testLdapManager.changePasswordUsername);
        assertNull(testLdapManager.changePasswordPassword);
        assertTrue(testLdapManager.changePasswordCalled);
    }

    public void test_load() {
        // Test load method

  public void testParse_empty() {
    CacheBuilderSpec spec = parse("");
    assertNull(spec.initialCapacity);
    assertNull(spec.maximumSize);
    assertNull(spec.maximumWeight);
    assertNull(spec.concurrencyLevel);
    assertNull(spec.keyStrength);
    assertNull(spec.valueStrength);
    assertNull(spec.writeExpirationTimeUnit);
    assertNull(spec.accessExpirationTimeUnit);

        // Arrange & Act
        SMBSignatureValidationException ex = new SMBSignatureValidationException();

        // Assert
        assertNull(ex.getMessage(), "Default ctor should not set a message");
        assertNull(ex.getCause(), "Default ctor should not set a cause");
        assertTrue(ex instanceof SmbException, "Should be an SmbException subtype");

        void testDefaultConstructor() {
            TransportException exception = new TransportException();

            assertNotNull(exception);
            assertNull(exception.getMessage());
            assertNull(exception.getRootCause());
            assertTrue(exception instanceof IOException);
        }

        @Test
        @DisplayName("Should create exception with message")

            assertNotNull(ex1);
            assertNull(ex1.getMessage());
            assertNull(ex1.getCause());
        });

        assertDoesNotThrow(() -> {
            SpnegoException ex2 = new SpnegoException("msg", null);
            assertNotNull(ex2);
            assertEquals("msg", ex2.getMessage());
            assertNull(ex2.getCause());
        });

        assertDoesNotThrow(() -> {

    } else {
      assertThrows(UnsupportedOperationException.class, () -> table.clear());
    }
  }

  public void testPut() {
    assertNull(table.put("foo", 1, cellValue('a')));
    assertNull(table.put("bar", 1, cellValue('b')));
    assertNull(table.put("foo", 3, cellValue('c')));
    assertEquals((Character) 'a', table.put("foo", 1, cellValue('d')));
    assertEquals((Character) 'd', table.get("foo", 1));

    public void test_constructor() {
        // Test default constructor
        DictionaryExpiredException exception = new DictionaryExpiredException();
        assertNotNull(exception);
        assertNull(exception.getMessage());
        assertNull(exception.getCause());
    }

    public void test_instanceOf() {
        // Test that exception is instance of RuntimeException

        // Verify
        assertNull(result);
    }

    public void test_getResponse_withUnsetType() {
        // Execute - requesting type without setting response
        ActionResponse result = authenticator.getResponse(SsoResponseType.METADATA);

        // Verify
        assertNull(result);
    }

    // Test logout method

    @Test
    public void testNullPasswordHandling() {
        authenticator = new NtlmPasswordAuthenticator("DOMAIN", "username", (String) null);

        assertNull(authenticator.getPassword(), "getPassword should return null for null password");
        assertNull(authenticator.getPasswordAsCharArray(), "getPasswordAsCharArray should return null for null password");

        // secureWipePassword should not throw exception