import org.eclipse.e4.ui.services.IServiceConstants;

import org.eclipse.e4.workbench.modeling.EPartService;

	public void testEPartService_Activate() throws Exception {

		// create a window with two parts

		MWindow window = MApplicationFactory.eINSTANCE.createWindow();

		MPart part = MApplicationFactory.eINSTANCE.createPart();

		window.getChildren().add(part);

		part.setLabel("");

		part.setURI("platform:/plugin/org.eclipse.e4.ui.tests/org.eclipse.e4.ui.tests.workbench.SampleView");

		MPart part2 = MApplicationFactory.eINSTANCE.createPart();

		part2.setLabel("");

		part2.setURI("platform:/plugin/org.eclipse.e4.ui.tests/org.eclipse.e4.ui.tests.workbench.SampleView");

		window.getChildren().add(part2);

		window.setActiveChild(part2);

		// add the window to the app

		MApplication application = MApplicationFactory.eINSTANCE

				.createApplication();

		application.getChildren().add(window);

		application.setContext(appContext);

		appContext.set(MApplication.class.getName(), application);

		wb = new E4Workbench(application, appContext);

		// render

		wb.createAndRunUI(window);

		IEclipseContext windowContext = window.getContext();

		EPartService service = (EPartService) windowContext

				.get(EPartService.class.getName());

		// active part should be the second one

		assertEquals(part2, windowContext.get(IServiceConstants.ACTIVE_PART));

		assertEquals(part2, service.getActivePart());

		// activate the first one

		service.activate(part);

		// active part should be the first one

		assertEquals(part, windowContext.get(IServiceConstants.ACTIVE_PART));

		assertEquals(part, service.getActivePart());

	}