@Test
    void require_fallback_to_child_injector() {
        ComponentGraph componentGraph = new ComponentGraph();

        componentGraph.add(mockComponentNode(ComponentTakingExecutor.class));

        componentGraph.complete(singletonExecutorInjector);
        assertNotNull(componentGraph.getInstance(ComponentTakingExecutor.class));
    }
@author gjoranv
@author Tony Vaagenes
@author ollivir
container-core/src/test/java/com/yahoo/container/di/componentgraph/core/ComponentGraphTest.java