Revert "unit tests added"

This reverts commit b0f6d17c55.

tests/Avalonia.LeakTests/WindowDataContextTests.cs

@@ -1,70 +0,0 @@
-using System;
-using Avalonia.Controls;
-using Avalonia.Controls.ApplicationLifetimes;
-using Avalonia.Reactive;
-using Avalonia.Threading;
-using Avalonia.UnitTests;
-using JetBrains.dotMemoryUnit;
-using Xunit;
-using Xunit.Abstractions;
-
-namespace Avalonia.LeakTests;
-
-internal class ViewModelForDisposingTest
-{
-    ~ViewModelForDisposingTest() { ; }
-}
-
-[DotMemoryUnit(FailIfRunWithoutSupport = false)]
-public class WindowDataContextTests
-{
-    public WindowDataContextTests(ITestOutputHelper atr)
-    {
-        DotMemoryUnitTestOutput.SetOutputMethod(atr.WriteLine);
-    }
-    
-    [Fact]
-    public void Window_DataContext_Disposed_After_Window_Close_With_Lifetime()
-    {
-        static IDisposable Run()
-        {
-            var unitTestApp = UnitTestApplication.Start(TestServices.StyledWindow);
-            var lifetime = new ClassicDesktopStyleApplicationLifetime();
-            lifetime.ShutdownMode = ShutdownMode.OnExplicitShutdown;
-            var window = new Window { DataContext = new ViewModelForDisposingTest() };
-            window.Show();
-            window.Close();
-
-            return Disposable.Create(lifetime, lt => lt.Shutdown())
-                .DisposeWith(new CompositeDisposable(lifetime, unitTestApp));
-        }
-
-        using var _ = Run();
-        // Process all Loaded events to free control reference(s)
-        Dispatcher.UIThread.RunJobs(DispatcherPriority.Loaded);
-        GC.Collect();
-
-        dotMemory.Check(m => Assert.Equal(0, 
-            m.GetObjects(o => o.Type.Is<ViewModelForDisposingTest>()).ObjectsCount));
-    }
-    
-    [Fact]
-    public void Window_DataContext_Disposed_After_Window_Close_Without_Lifetime()
-    {
-        static void Run()
-        {
-            using var _ = UnitTestApplication.Start(TestServices.StyledWindow);
-            var window = new Window { DataContext = new ViewModelForDisposingTest() };
-            window.Show();
-            window.Close();
-        }
-
-        Run();
-        // Process all Loaded events to free control reference(s)
-        Dispatcher.UIThread.RunJobs(DispatcherPriority.Loaded);
-        GC.Collect();
-        
-        dotMemory.Check(m => Assert.Equal(0, 
-            m.GetObjects(o => o.Type.Is<ViewModelForDisposingTest>()).ObjectsCount));
-    }
-}