Bug 305389 EclipsePartService: Add getInputParts(String inputUri): Collection
Add support for the new InputPart-Type with Input-URI
tests/org.eclipse.e4.ui.tests/src/org/eclipse/e4/ui/tests/application/EPartServiceTest.java
assertNull("There should be nothing active in the second window",
				windowService2.getActivePart());
		
		windowService1.activate(part);
		assertEquals("The part should have been activated", part,
				windowService1.getActivePart());
		assertNull("The second window has no parts, this should be null",
				windowService2.getActivePart());
		
		windowService1.deactivate(part);
		window2.getChildren().add(part);
		part.getContext().set(IContextConstants.PARENT, window2.getContext());
		
		windowService2.activate(part);
		assertEquals("No parts in this window, this should be null", null,
				windowService1.getActivePart());
		assertEquals("We activated it just now, this should be active", part,
				windowService2.getActivePart());
	}
	public void testApplicationContextHasActivePart() {
		MApplication application = MApplicationFactory.eINSTANCE
				.createApplication();
		MWindow window = MApplicationFactory.eINSTANCE.createWindow();
		application.getChildren().add(window);
		application.setSelectedElement(window);
		MPart partA = MApplicationFactory.eINSTANCE.createPart();
		MPart partB = MApplicationFactory.eINSTANCE.createPart();
		window.getChildren().add(partA);
		window.getChildren().add(partB);
		window.setSelectedElement(partA);