public void ShowToolwindowNegativeTest()
        {
            IVsPackage package = new VisualStudioHaskellPackage() as IVsPackage;

            // Create a basic service provider
            OleServiceProvider serviceProvider = OleServiceProvider.CreateOleServiceProviderWithBasicServices();

            //Add uishell service that knows how to create a toolwindow
            BaseMock uiShellService = UIShellServiceMock.GetUiShellInstanceCreateToolWinReturnsNull();

            serviceProvider.AddService(typeof(SVsUIShell), uiShellService, false);

            // Add site support to register editor factory
            BaseMock registerEditor = VisualStudioHaskell_UnitTests.EditorTests.RegisterEditorsServiceMock.GetRegisterEditorsInstance();

            serviceProvider.AddService(typeof(SVsRegisterEditors), registerEditor, false);

            // Site the package
            Assert.AreEqual(0, package.SetSite(serviceProvider), "SetSite did not return S_OK");

            MethodInfo method = typeof(VisualStudioHaskellPackage).GetMethod("ShowToolWindow", BindingFlags.NonPublic | BindingFlags.Instance);

            //Invoke thows TargetInvocationException, but we want it's inner Exception thrown by ShowToolWindow, InvalidOperationException.
            try {
                object result = method.Invoke(package, new object[] { null, null });
            } catch (Exception e) {
                throw e.InnerException;
            }
        }
        public void ValidateToolWindowShown()
        {
            IVsPackage package = new VisualStudioHaskellPackage() as IVsPackage;

            // Create a basic service provider
            OleServiceProvider serviceProvider = OleServiceProvider.CreateOleServiceProviderWithBasicServices();

            //Add uishell service that knows how to create a toolwindow
            BaseMock uiShellService = UIShellServiceMock.GetUiShellInstanceCreateToolWin();

            serviceProvider.AddService(typeof(SVsUIShell), uiShellService, false);

            // Add site support to register editor factory
            BaseMock registerEditor = VisualStudioHaskell_UnitTests.EditorTests.RegisterEditorsServiceMock.GetRegisterEditorsInstance();

            serviceProvider.AddService(typeof(SVsRegisterEditors), registerEditor, false);

            // Site the package
            Assert.AreEqual(0, package.SetSite(serviceProvider), "SetSite did not return S_OK");

            MethodInfo method = typeof(VisualStudioHaskellPackage).GetMethod("ShowToolWindow", BindingFlags.NonPublic | BindingFlags.Instance);

            object result = method.Invoke(package, new object[] { null, null });
        }