Bug 334559 EPartService's part searching path may not include parts outside of the active perspective
tests/org.eclipse.e4.ui.tests/src/org/eclipse/e4/ui/tests/application/EPartServiceTest.java
MPlaceholder partPlaceholder = AdvancedFactoryImpl.eINSTANCE
				.createPlaceholder();
		partPlaceholder.setRef(part);
		part.setCurSharedRef(partPlaceholder);
		area.getChildren().add(partPlaceholder);
		area.setSelectedElement(partPlaceholder);
		initialize(applicationContext, application);
		getEngine().createGui(window);
		EPartService partService = window.getContext().get(EPartService.class);
		partService.hidePart(part, force);
		assertFalse(partPlaceholder.isToBeRendered());
	}
	public void testHidePart_Bug327964_True() {
		testHidePart_Bug327964(true);
	}
	public void testHidePart_Bug327964_False() {
		testHidePart_Bug327964(false);
	}
	private void testHidePart_Bug332163(boolean force) {
		MApplication application = ApplicationFactoryImpl.eINSTANCE
				.createApplication();
		MWindow window = BasicFactoryImpl.eINSTANCE.createWindow();
		application.getChildren().add(window);
		application.setSelectedElement(window);
		MPart part = BasicFactoryImpl.eINSTANCE.createPart();
		window.getSharedElements().add(part);
		MPerspectiveStack perspectiveStack = AdvancedFactoryImpl.eINSTANCE
				.createPerspectiveStack();
		window.getChildren().add(perspectiveStack);
		window.setSelectedElement(perspectiveStack);