assertNull(exception.getCause());
        assertEquals(componentName, exception.getComponentName());
    }

    public void test_constructor_withNullCause() {
        // Test constructor with null cause only
        ContainerNotAvailableException exception = new ContainerNotAvailableException((Throwable) null);

        assertNull(exception.getMessage());
        assertEquals(cause, exception.getCause());
        assertEquals(messageCode, exception.getMessageCode());
    }

    public void test_constructor_withNullCause() {
        // Setup
        final String message = "Test error with null cause";
        final VaMessenger<FessMessages> messageCode = messages -> messages.addErrorsSsoLoginError(UserMessages.GLOBAL_PROPERTY_KEY);

        assertNull(exception.getMessage());
        assertEquals(cause, exception.getCause());
        assertEquals(messageCode, exception.getMessageCode());
    }

    public void test_constructor_withNullCause() {
        // Setup
        final String message = "Query validation failed";
        final VaMessenger<FessMessages> messageCode = messages -> messages.addErrorsInvalidQueryUnknown(UserMessages.GLOBAL_PROPERTY_KEY);

        assertEquals("java.lang.IllegalArgumentException: Root cause", exception.getMessage());
    }

    /**
     * Test constructor with null cause
     */
    public void test_constructor_withNullCause() {
        CrawlerSystemException exception = new CrawlerSystemException((Throwable) null);

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