Force GC from generation 0 to generation 2

Author: rmarinho

src/Compatibility/Core/tests/Android/Issues.cs

@@ -122,7 +122,7 @@ public async Task TextCellDisposed()
 
 				if (m == 1)
 				{
-					GC.Collect();
+					GC.Collect(2);
 				}
 
 				model.Text = model.Text == text1 ? text2 : text1;

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

@@ -0,0 +1,28 @@
+using System;
+using System.Threading.Tasks;
+using Microsoft.Maui.Controls;
+using Microsoft.Maui.Controls.Handlers.Items;
+using Xunit;
+
+namespace Microsoft.Maui.Controls.Core.UnitTests
+{
+	public class CollectionViewTests : BaseTestFixture
+	{
+		[Fact, Category(TestCategory.Memory)]
+		public async Task CanCollectEmptyView()
+		{
+			var collectionView = new CollectionView { IsPlatformEnabled = true };
+			collectionView.EmptyView = new View();
+
+			var weakReference = new WeakReference(collectionView.EmptyView);
+
+			collectionView.EmptyView = null;
+
+			await Task.Yield();
+			GC.Collect(2);
+			GC.WaitForPendingFinalizers();
+
+			Assert.False(weakReference.IsAlive);
+		}
+	}
+}

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

@@ -8,7 +8,11 @@ internal static class TestHelpers
 		public static async Task Collect()
 		{
 			await Task.Yield();
-			GC.Collect();
+			GC.Collect(2);
+			GC.WaitForPendingFinalizers();
+
+			await Task.Yield();
+			GC.Collect(2);
 			GC.WaitForPendingFinalizers();
 			GC.Collect(2, GCCollectionMode.Forced, true);
 			GC.WaitForPendingFinalizers();

src/Controls/tests/TestCases.HostApp/Utils/GarbageCollectionHelper.cs

@@ -7,7 +7,7 @@ public static void Collect()
 			GC.Collect();
 			GC.WaitForPendingFinalizers();
 
-			GC.Collect();
+			GC.Collect(2);
 			GC.WaitForPendingFinalizers();
 		}
 
@@ -17,7 +17,7 @@ public static async Task WaitForGC(int timeout, params WeakReference[] reference
 		{
 			bool referencesCollected()
 			{
-				GC.Collect();
+				GC.Collect(2);
 				GC.WaitForPendingFinalizers();
 
 				foreach (var reference in references)

src/Controls/tests/Xaml.UnitTests/Issues/Maui22036.xaml.cs

@@ -36,7 +36,7 @@ public async Task StyleWithTriggerLeak([Values] XamlInflator inflator)
 
 			var pagewr = new WeakReference(new Maui22036(inflator));
 			await Task.Delay(10);
-			GC.Collect();
+			GC.Collect(2);
 			Assert.IsNull(pagewr.Target, "Page leaked");
 		}
 	}

src/Core/tests/DeviceTests.Shared/HandlerTests/TestBase.cs

@@ -34,7 +34,7 @@ protected static async Task WaitForGC()
 			GC.Collect();
 			GC.WaitForPendingFinalizers();
 			await Task.Delay(10);
-			GC.Collect();
+			GC.Collect(2);
 			GC.WaitForPendingFinalizers();
 			await Task.Delay(10);
 		}

src/Core/tests/DeviceTests/Services/ImageSource/ImageSourceServiceTests.iOS.cs

@@ -129,7 +129,7 @@ static Task<bool> TryCollectFile(string bitmapFile)
 
 			for (var i = 0; i < GCCollectRetries; i++)
 			{
-				GC.Collect();
+				GC.Collect(2);
 
 				// TODO: implement a "native" caching system everywhere on ios and update this
 			}

src/Core/tests/UnitTests/MauiContextTests.cs

@@ -50,7 +50,7 @@ public void AddSpecificIsNotWeak()
 
 			DoAdd(context);
 
-			GC.Collect();
+			GC.Collect(2);
 			GC.WaitForPendingFinalizers();
 
 			Assert.NotNull(context.Services.GetService<TestThing>());
@@ -71,7 +71,7 @@ public void AddWeakSpecificIsWeak()
 
 			DoAdd(context);
 
-			GC.Collect();
+			GC.Collect(2);
 			GC.WaitForPendingFinalizers();
 
 			Assert.Null(context.Services.GetService<TestThing>());

src/Core/tests/UnitTests/TestHelpers.cs

@@ -10,7 +10,7 @@ public static async Task<bool> WaitForCollect(this WeakReference reference)
 			for (int i = 0; i < 40 && reference.IsAlive; i++)
 			{
 				await Task.Yield();
-				GC.Collect();
+				GC.Collect(2);
 				GC.WaitForPendingFinalizers();
 			}
 

src/Core/tests/UnitTests/Views/BorderTests.cs

@@ -64,7 +64,7 @@ public async Task BorderStrokeShapeSubscribed()
 			};
 
 			await Task.Yield();
-			GC.Collect();
+			GC.Collect(2);
 			GC.WaitForPendingFinalizers();
 			GC.KeepAlive(border);
 
@@ -87,7 +87,7 @@ public async Task BorderStrokeSubscribed()
 			};
 
 			await Task.Yield();
-			GC.Collect();
+			GC.Collect(2);
 			GC.WaitForPendingFinalizers();
 			GC.KeepAlive(border);