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/application/UIStartupTest.java
Realm.runWithDefault(SWTObservables.getRealm(display), new Runnable() {
			public void run() {
				contexts[0] = UIStartupTest.super
						.createApplicationContext(osgiContext);
				contexts[0].set(IStylingEngine.class.getName(),
						new IStylingEngine() {
							public void style(Object widget) {
								
							}
							public void setId(Object widget, String id) {
								
							}
							public void setClassname(Object widget,
									String classname) {
								
							}
						});
			}
		});
		return contexts[0];
	}
	protected void createGUI(final MUIElement uiRoot) {
		Realm.runWithDefault(SWTObservables.getRealm(display), new Runnable() {
			public void run() {
				UIStartupTest.super.createGUI(uiRoot);
			}
		});
	}
}