@Test
    void testIdNamespaceLookup() {
        assertEquals(component1,  registry.getComponent(idInNamespace(namespace1)));
        assertEquals(component2,  registry.getComponent(idInNamespace(namespace2)));
        assertEquals(component21, registry.getComponent(idInNamespace(namespace21)));
    }
Tests that ComponentRegistry handles namespaces correctly.

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