@BeforeEach
    public void before() {
        registry = new ComponentRegistry<>();

        registry.register(component1.getId(), component1);
        registry.register(component2.getId(), component2);
        registry.register(component21.getId(), component21);
    }
Tests that ComponentRegistry handles namespaces correctly.

@author Tony Vaagenes
container-core/src/test/java/com/yahoo/component/provider/test/ComponentRegistryTestCase.java