Make PopLifeCycle more reliable

src/Controls/tests/Core.UnitTests/NavigationPageLifecycleTests.cs

@@ -67,9 +67,22 @@ public async Task PopLifeCycle(bool useMaui)
 			ContentPage pageDisappeared = null;
 
 			NavigationPage nav = new TestNavigationPage(useMaui, initialPage);
+
+			// Because of queued change propagation on BPs
+			// sometimes the appearing will fire a bit later than we expect.
+			// This ensures the first one fires before we move on
+			TaskCompletionSource waitForFirstAppearing = new TaskCompletionSource();
+			initialPage.Appearing += OnInitialPageAppearing;
+			void OnInitialPageAppearing(object sender, EventArgs e)
+			{
+				waitForFirstAppearing.SetResult();
+				initialPage.Appearing -= OnInitialPageAppearing;
+			}
+
 			_ = new TestWindow(nav);
-			nav.SendAppearing();
 
+			nav.SendAppearing();
+			await waitForFirstAppearing.Task;
 			initialPage.Appearing += (sender, _)
 				=> rootPageFiresAppearingAfterPop = (ContentPage)sender;
 

src/Core/tests/UnitTests/Hosting/HostBuilderLoggingTests.cs

@@ -35,6 +35,10 @@ public void CanAddLoggingProviders()
 			var mauiApp = builder.Build();
 
 			ILogger logger = mauiApp.Services.GetService<ILogger<HostBuilderLoggingTests>>();
+
+			// When running in parallel "build" might generate messages
+			// from the dispatcher so let's clear those up before starting our test
+			loggerProvider.Messages.Clear();
 			logger.LogError("An error");
 			Assert.Single(loggerProvider.Messages);
 			Assert.Equal("An error", loggerProvider.Messages[0]);