// Expect null message and null cause
        assertNull(e.getMessage());
        assertNull(e.getCause());
    }

    /**
     * Test the constructor with a message.
     */
    @Test
    void testMessageConstructor() {
        String errorMessage = "This is a test error message.";
        PACDecodingException e = new PACDecodingException(errorMessage);

        SmbNegotiation negotiationAllNull = new SmbNegotiation(null, null, null, null);

        assertNull(negotiationAllNull.getRequest());
        assertNull(negotiationAllNull.getResponse());
        assertNull(negotiationAllNull.getRequestRaw());
        assertNull(negotiationAllNull.getResponseRaw());
    }

    @Test
    @DisplayName("getRequest should return the same request instance")

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

    @Test
    public void test_constructor_withNullMessageAndCause() {
        // Test constructor with null message and null cause
        PluginException exception = new PluginException(null, null);

        assertNotNull(exception);
        assertNull(exception.getMessage());

        CurlException exception = new CurlException(null);

        assertNull(exception.getMessage());
        assertNull(exception.getCause());
    }

    @Test
    public void testConstructorWithNullMessageAndCause() {
        IOException cause = new IOException("IO error");
        CurlException exception = new CurlException(null, cause);

        assertNull(exception.getMessage());
        assertSame(cause, exception.getCause());

        // Test constructor with null message
        DictionaryException exception = new DictionaryException(null);

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

    @Test
    public void test_constructor_withNullMessageAndCause() {
        // Test constructor with null message but valid cause

        assertNull(exception.getCause());
    }

    @Test
    public void test_constructor_withUnicodeCharacters() {
        // Test with username containing Unicode characters
        String username = "ユーザー名";
        FessUserNotFoundException exception = new FessUserNotFoundException(username);

        assertNotNull(exception);
        assertEquals("User is not found: ユーザー名", exception.getMessage());
        assertNull(exception.getCause());

        assertEquals(message, exception.getMessage());
        assertNull(exception.getCause());
    }

    @Test
    public void test_constructor_withNullMessageAndCause() {
        // Test constructor with both null message and cause
        SsoProcessException exception = new SsoProcessException(null, null);

        assertNull(exception.getMessage());
        assertNull(exception.getCause());
    }

    @Test

  @CollectionSize.Require(ZERO)
  public void testEmptySetPollFirst() {
    assertNull(navigableSet.pollFirst());
  }

  @CollectionSize.Require(ZERO)
  public void testEmptySetNearby() {
    assertNull(navigableSet.lower(e0()));
    assertNull(navigableSet.floor(e0()));
    assertNull(navigableSet.ceiling(e0()));
    assertNull(navigableSet.higher(e0()));
  }

  @CollectionFeature.Require(SUPPORTS_REMOVE)

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

    @Test
    public void test_constructorWithNullMessageAndCause() {
        // Test constructor with null message and null cause
        GsaConfigException exception = new GsaConfigException(null, null);

        assertNotNull(exception);
        assertNull(exception.getMessage());

        testFessConfig.ldapAdminSyncPassword = false;

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

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

    @Test
    public void test_load() {
        // Test load method