// Verify the complete chain
        assertEquals("Plugin failure", exception.getMessage());
        assertEquals(level1, exception.getCause());
        assertEquals("Runtime error", exception.getCause().getMessage());
        assertEquals(level2, exception.getCause().getCause());
        assertEquals("Invalid state", exception.getCause().getCause().getMessage());
        assertEquals(level3, exception.getCause().getCause().getCause());

        assertNotNull(exception);
        assertEquals(message, exception.getMessage());
        assertNotNull(exception.getCause());
        assertEquals(cause, exception.getCause());
        assertEquals("Underlying error", exception.getCause().getMessage());
    }

    @Test
    public void test_constructor_withNullMessage() {
        // Test constructor with null message

        assertEquals(messageCode, exception3Params.getMessageCode());
        assertEquals(message, exception3Params.getMessage());
        assertEquals(cause, exception3Params.getCause());

        assertEquals(messageCode, exception2Params.getMessageCode());
        assertEquals(message, exception2Params.getMessage());
        assertNull(exception2Params.getCause());
    }

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

    @Test
    public void test_constructor_withNullMessage() {
        // Test constructor with null message
        SearchEngineClientException exception = new SearchEngineClientException(null);

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

        assertEquals(message, ex.getMessage());
        assertEquals(cause, ex.getCause());
    }

    @Test
    @DisplayName("Should handle null message and/or cause without throwing")
    void testNullInputs() {
        assertDoesNotThrow(() -> {
            SpnegoException ex1 = new SpnegoException((String) null);
            assertNotNull(ex1);
            assertNull(ex1.getMessage());
            assertNull(ex1.getCause());

        assertNotNull(exception);
        assertTrue(exception.getMessage().startsWith("Not Found: http://example.com/"));
        assertTrue(exception.getMessage().contains("Parent: http://example.com/"));
        assertNull(exception.getCause());
    }

    @Test
    public void test_constructor_withUnicodeCharacters() {

        // Execute
        final SsoMessageException exception = new SsoMessageException(messageCode, message, cause);

        // Verify
        assertNotNull(exception);
        assertEquals(message, exception.getMessage());
        assertEquals(cause, exception.getCause());
        assertEquals(messageCode, exception.getMessageCode());
    }

    @Test
    public void test_constructor_withMessageCodeAndMessage() {
        // Setup

            TransportException wrapper = new TransportException("Wrapper", original);

            assertEquals("Wrapper", wrapper.getMessage());
            assertEquals(original, wrapper.getRootCause());
            assertEquals(originalMessage, ((TransportException) wrapper.getRootCause()).getMessage());
        }
    }

        }
    }

    @Test
    public void test_setObject_withNullName() {
        // Test setObject with null name
        try {
            WebApiUtil.setObject(null, "testValue");
        } catch (Exception e) {
            fail("setObject should handle null name gracefully: " + e.getMessage());
        }
    }

    @Test

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

        // Test with empty string
        TransportException emptyException = new TransportException("");
        assertEquals("", emptyException.getMessage());

        // Test with null message