public void CanDetectWhereAndWhatToInsert() { var profile = TestProfile.CreateEmpty(); profile.Datacontext.XamlPageAttribute = "DataContext=\"HasBeenSet\""; var logger = DefaultTestLogger.Create(); var activeDocText = "<Page" + Environment.NewLine + " xmlns=\"http://schemas.microsoft.com/winfx/2006/xaml/presentation\"" + Environment.NewLine + " >" + Environment.NewLine + " <!-- Content would go here -->" + Environment.NewLine + "</Page>"; var vs = new TestVisualStudioAbstraction { ActiveDocumentFileName = "test.xaml", ActiveDocumentText = activeDocText, }; var fs = new TestFileSystem(); var sut = new SetDataContextCommandLogic(profile, logger, vs, fs); var result = sut.GetPageAttributeToAdd("TestViewModel", "Tests"); Assert.IsTrue(result.anythingToAdd); Assert.AreEqual(2, result.lineNoToAddAfter); Assert.AreEqual($"{Environment.NewLine} DataContext=\"HasBeenSet\"", result.contentToAdd); }