testFessConfig.ldapAdminSyncPassword = false;

        boolean result = ldapChain.changePassword("testuser", "newpassword");

        assertFalse(result); // returns !changed || syncPassword = !true || false = false
        assertEquals("testuser", testLdapManager.changePasswordUsername);
        assertEquals("newpassword", testLdapManager.changePasswordPassword);

    public void test_constructor_withValidUsername() {
        // Test with a normal username
        String username = "testuser";
        FessUserNotFoundException exception = new FessUserNotFoundException(username);

        assertNotNull(exception);
        assertEquals("User is not found: testuser", exception.getMessage());
        assertNull(exception.getCause());
    }

    public void test_constructor_withEmptyUsername() {