Bug 294493 XMI definition of part icon is ignored
The icon URI definition for parts seem to be ignored as the part tabs don't have any icons.
tests/org.eclipse.e4.ui.tests/src/org/eclipse/e4/ui/tests/workbench/MPartTest.java
if (contributionFactory == null) {
			contributionFactory = new ReflectionContributionFactory(
					RegistryFactory.getRegistry());
		}
		return contributionFactory;
	}
	private Display getDisplay() {
		display = Display.getCurrent();
		if (display == null) {
			display = new Display();
		}
		return display;
	}
	protected void processEventLoop() {
		if (display != null) {
			while (display.readAndDispatch())
				;
		}
	}
	private Widget topWidget;
	private Display display;
	@Override
	protected void tearDown() throws Exception {
		super.tearDown();
		if (topWidget != null) {
			topWidget.dispose();
			topWidget = null;
		}
	}
	public void testCreateView() {