Bug 280846 [UI][CSS] Null styling engine required in main context for tests to run
bundles/org.eclipse.e4.ui.workbench/src/org/eclipse/e4/workbench/ui/internal/Workbench.java
package org.eclipse.e4.workbench.ui.internal;
import java.io.File;
import java.io.IOException;
import java.net.URISyntaxException;
import java.net.URLConnection;
import java.util.Collections;
import java.util.Map;
import org.eclipse.core.commands.Category;
import org.eclipse.core.commands.Command;
import org.eclipse.core.commands.CommandManager;
import org.eclipse.core.commands.contexts.ContextManager;
import org.eclipse.core.internal.runtime.PlatformURLPluginConnection;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IAdapterManager;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IExtensionRegistry;
import org.eclipse.core.runtime.RegistryFactory;
import org.eclipse.e4.core.services.IContributionFactory;
import org.eclipse.e4.core.services.Logger;
import org.eclipse.e4.core.services.context.EclipseContextFactory;
import org.eclipse.e4.core.services.context.IEclipseContext;
import org.eclipse.e4.core.services.context.spi.ContextFunction;
import org.eclipse.e4.core.services.context.spi.ContextInjectionFactory;
import org.eclipse.e4.core.services.context.spi.IContextConstants;
import org.eclipse.e4.ui.internal.services.ActiveContextsFunction;
import org.eclipse.e4.ui.internal.services.ContextCommandService;
import org.eclipse.e4.ui.model.application.ApplicationFactory;
import org.eclipse.e4.ui.model.application.ApplicationPackage;
import org.eclipse.e4.ui.model.application.MApplication;
import org.eclipse.e4.ui.model.application.MApplicationElement;