TestComponent.resetCounter();
        factory.setComponentName("testComponent");

        final List<TestComponent> destroyedComponents = new ArrayList<>();
        factory.setOnDestroyListener(new OnDestroyListener<TestComponent>() {
            @Override
            public void onDestroy(PooledObject<TestComponent> p) {
                TestComponent component = p.getObject();

        assertSame(result1, result2);
        assertSame(mockConfig, result1);
    }

    public void test_register_and_getComponent() {
        String testInstance = "test_instance";
        String componentName = "testComponent";

        ComponentUtil.register(testInstance, componentName);

        String retrieved = ComponentUtil.getComponent(componentName);
        assertSame(testInstance, retrieved);
    }

public class ContainerNotAvailableExceptionTest extends UnitFessTestCase {

    public void test_constructor_withComponentName() {
        // Test constructor with component name only
        String componentName = "testComponent";
        ContainerNotAvailableException exception = new ContainerNotAvailableException(componentName);

        assertEquals(componentName + " is not available.", exception.getMessage());