Run multiple UI tests without restarting ControlGallery (#539)

* Allow UI tests to bypass "manual" navigation to isses pages

* Add missing Preserve attribute

* Make Issue198 test work with direct navigation

* Remove empty UI tests

* Fix error handling for iOS

* Use navigation which works for subsequent TestNavigationPages on iOS

* Fix race condition in 39530 test
Remove master page nesting when doing direct nav for UI tests

* Set up and run a single instance of Control Gallery for UI tests

* Force NavigateToIssue to wait for main page appearing to deal with iOS timing

* Move remaining UI tests into Issues namespace

* Change the connection check URL so it'll work on iOS

* Make Appearing Gallery tests work without restarting app

* Prevent ContextActions tests from stepping on each other

* Make context menu test more robust

* Move ButtonExtensions back to Controls namespace

* Have test 774 dismiss the action sheet before ending

* Update UITest package to 2.0.0 stable

* Make 2948 restore orientation when it's done

* Null check on PageController before calling SendDisappearing

* Adding a wait for the root page in the core tests

* Add consecutive tests reset to prevent memory slog on older iOS devices

3 files changed, 54 insertions, 7 deletions

diff --git a/Xamarin.Forms.Controls/App.cs b/Xamarin.Forms.Controls/App.cs
index 3af36ee3..fcf0b1f6 100644
--- a/Xamarin.Forms.Controls/App.cs
+++ b/Xamarin.Forms.Controls/App.cs
@@ -22,16 +22,14 @@ namespace Xamarin.Forms.Controls
 		static Dictionary<string, string> s_config;
 		readonly ITestCloudService _testCloudService;
 
+		public const string DefaultMainPageId = "ControlGalleryMainPage";
+
 		public App()
 		{
 			_testCloudService = DependencyService.Get<ITestCloudService>();
 			InitInsights();
 
-			MainPage = new MasterDetailPage
-			{
-				Master = new ContentPage { Title = "Master", BackgroundColor = Color.Red },
-				Detail = CoreGallery.GetMainPage()
-			};
+			SetMainPage(CreateDefaultMainPage());
 
 			//// Uncomment to verify that there is no gray screen displayed between the blue splash and red MasterDetailPage.
 			//MainPage = new Bugzilla44596SplashPage(() =>
@@ -46,6 +44,16 @@ namespace Xamarin.Forms.Controls
 			//});
 		}
 
+		public Page CreateDefaultMainPage()
+		{
+			return new MasterDetailPage
+			{
+				AutomationId = DefaultMainPageId,
+				Master = new ContentPage { Title = "Master", BackgroundColor = Color.Red },
+				Detail = CoreGallery.GetMainPage()
+			};
+		}
+
 		protected override void OnAppLinkRequestReceived(Uri uri)
 		{
 			var appDomain = "http://" + AppName.ToLowerInvariant() + "/";
@@ -154,5 +162,43 @@ namespace Xamarin.Forms.Controls
 				text = await reader.ReadToEndAsync();
 			return text;
 		}
+
+		public bool NavigateToTestPage(string test)
+		{
+			try
+			{
+				// Create an instance of the main page
+				var root = CreateDefaultMainPage();
+
+				// Set up a delegate to handle the navigation to the test page
+				EventHandler toTestPage = null;
+
+				toTestPage = delegate(object sender, EventArgs e) 
+				{
+					Current.MainPage.Navigation.PushModalAsync(TestCases.GetTestCases());
+					TestCases.TestCaseScreen.PageToAction[test]();
+					Current.MainPage.Appearing -= toTestPage;
+				};
+
+				// And set that delegate to run once the main page appears
+				root.Appearing += toTestPage;
+
+				SetMainPage(root);
+
+				return true;
+			}
+			catch (Exception ex) 
+			{
+				Log.Warning("UITests", $"Error attempting to navigate directly to {test}: {ex}");
+
+			}
+
+			return false;
+		}
+		
+		public void Reset()
+		{
+			SetMainPage(CreateDefaultMainPage());
+		}
 	}
 }
\ No newline at end of file
diff --git a/Xamarin.Forms.Controls/ControlGalleryPages/AppearingGalleryPage.cs b/Xamarin.Forms.Controls/ControlGalleryPages/AppearingGalleryPage.cs
index 0df2eeb3..21d91906 100644
--- a/Xamarin.Forms.Controls/ControlGalleryPages/AppearingGalleryPage.cs
+++ b/Xamarin.Forms.Controls/ControlGalleryPages/AppearingGalleryPage.cs
@@ -69,13 +69,13 @@ namespace Xamarin.Forms.Controls
 			{
 				page.Appearing += (object sender, EventArgs e) => {
 					_isAppearingFired++;
-					App.AppearingMessages.Add ($"Appearing {page.Title}");
+					App.AppearingMessages.Insert (0, $"Appearing {page.Title}");
 					Debug.WriteLine ($"Appearing {page.Title}");
 				};
 
 				page.Disappearing += (object sender, EventArgs e) => {
 					_isDisappearingFired++;
-					App.AppearingMessages.Add ($"Disappearing {page.Title}");
+					App.AppearingMessages.Insert (0, $"Disappearing {page.Title}");
 					Debug.WriteLine( $"Disappearing {page.Title}");
 				};
 			}
diff --git a/Xamarin.Forms.Controls/GalleryPages/MasterDetailPageTabletPage.cs b/Xamarin.Forms.Controls/GalleryPages/MasterDetailPageTabletPage.cs
index f8aba26b..8f272182 100644
--- a/Xamarin.Forms.Controls/GalleryPages/MasterDetailPageTabletPage.cs
+++ b/Xamarin.Forms.Controls/GalleryPages/MasterDetailPageTabletPage.cs
@@ -1,4 +1,5 @@
 using System;
+using Xamarin.Forms.Controls.Issues;
 
 namespace Xamarin.Forms.Controls
 {