### Question:
AcmeGraph extends AcmeModelView { public IAcmeSystem getCurrentSystem() { return currentSystem; } AcmeGraph(AbstractRainbowVaadinUI ui); IAcmeSystem getCurrentSystem(); void setCurrentSystem(IAcmeSystem system); void resetGraph();  }### Answer:
@Test public void testRootComponent() throws Exception { System.out.println("get/set RootComponent"); AcmeGraph instance = new AcmeGraph(dummyUI); String expResult = "ZNewsSys"; IAcmeSystem result = instance.getCurrentSystem(); assertNotNull(result); assertEquals(expResult, result.getName()); }