Bug 280846 [UI][CSS] Null styling engine required in main context for tests to run
tests/org.eclipse.e4.ui.tests/src/org/eclipse/e4/ui/tests/workbench/RunApplicationTest.java
public void run() {
				display = new Display();
				final URI initialWorkbenchDefinitionInstance = URI
						.createPlatformPluginURI(uri, true);
				Realm.runWithDefault(SWTObservables.getRealm(display),
						new Runnable() {
							public void run() {
								try {
									
									
									
									IEclipseContext serviceContext = EclipseContextFactory
											.createServiceContext(bundleContext);
									applicationContext = EclipseContextFactory
											.create(serviceContext, null);
									applicationContext.set(
											IContextConstants.DEBUG_STRING,
											"application"); 
									applicationContext
											.set(IResourceUtiltities.class
													.getName(),
													new ResourceUtility(
															getBundleAdmin()));
									WorkbenchStylingSupport
											.initializeNullStyling(applicationContext);
									workbench = new Workbench(
											getInstanceLocation(),
											RegistryFactory.getRegistry(),
											getBundleAdmin(),
											applicationContext,