Reuse same tests for XUnit and NUnit

tests/Avalonia.Headless.NUnit.UnitTests/AssemblyInfo.cs

@@ -0,0 +1,9 @@
+global using NUnit.Framework;
+global using AvaloniaFactAttribute = Avalonia.Headless.NUnit.AvaloniaTestAttribute;
+global using AvaloniaTheoryAttribute = Avalonia.Headless.NUnit.AvaloniaTheoryAttribute;
+global using InlineDataAttribute = NUnit.Framework.TestCaseAttribute; 
+
+using Avalonia.Headless;
+using Avalonia.Headless.UnitTests;
+
+[assembly: AvaloniaTestApplication(typeof(TestApplication))]

tests/Avalonia.Headless.NUnit.UnitTests/Avalonia.Headless.NUnit.UnitTests.csproj

@@ -0,0 +1,29 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <IsTestProject>true</IsTestProject>
+    <DefineConstants>$(DefineConstants);NUNIT</DefineConstants>
+  </PropertyGroup>
+
+  <Import Project="..\..\build\UnitTests.NetCore.targets" />
+  <Import Project="..\..\build\UnitTests.NetFX.props" />
+  <Import Project="..\..\build\Moq.props" />
+  <Import Project="..\..\build\Rx.props" />
+  <Import Project="..\..\build\SharedVersion.props" />
+
+  <ItemGroup>
+    <PackageReference Include="NUnit" Version="3.13.3" />
+    <PackageReference Include="NUnit3TestAdapter" Version="4.4.2" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.5.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Compile Include="..\Avalonia.Headless.UnitTests\**\*.cs" />
+  </ItemGroup>
+  
+  <ItemGroup>
+    <ProjectReference Include="..\..\src\Avalonia.Themes.Simple\Avalonia.Themes.Simple.csproj" />
+    <ProjectReference Include="..\..\src\Headless\Avalonia.Headless.NUnit\Avalonia.Headless.NUnit.csproj" />
+    <ProjectReference Include="..\..\src\Skia\Avalonia.Skia\Avalonia.Skia.csproj" />
+  </ItemGroup>
+</Project>

tests/Avalonia.Headless.UnitTests/InputTests.cs

@@ -2,13 +2,12 @@ using Avalonia.Controls;
 using Avalonia.Input;
 using Avalonia.Layout;
 using Avalonia.Threading;
-using Xunit;
 
 namespace Avalonia.Headless.UnitTests;
 
 public class InputTests
 {
-    [Fact]
+    [AvaloniaFact]
     public void Should_Click_Button_On_Window()
     {
         var buttonClicked = false;

tests/Avalonia.Headless.UnitTests/RenderingTests.cs

@@ -2,13 +2,12 @@
 using Avalonia.Layout;
 using Avalonia.Media;
 using Avalonia.Threading;
-using Xunit;
 
 namespace Avalonia.Headless.UnitTests;
 
 public class RenderingTests
 {
-    [Fact]
+    [AvaloniaFact]
     public void Should_Render_Last_Frame_To_Bitmap()
     {
         var window = new Window

tests/Avalonia.Headless.UnitTests/TestApplication.cs

@@ -1,10 +1,5 @@
 using Avalonia.Headless.UnitTests;
-using Avalonia.Headless.XUnit;
 using Avalonia.Themes.Simple;
-using Xunit;
-
-[assembly: AvaloniaTestFramework(typeof(TestApplication))]
-[assembly: CollectionBehavior(DisableTestParallelization = true)]
 
 namespace Avalonia.Headless.UnitTests;
 

tests/Avalonia.Headless.UnitTests/ThreadingTests.cs

@@ -2,31 +2,37 @@
 using System.Threading;
 using System.Threading.Tasks;
 using Avalonia.Threading;
-using Xunit;
 
 namespace Avalonia.Headless.UnitTests;
 
 public class ThreadingTests
 {
-    [Fact]
+    [AvaloniaFact]
     public void Should_Be_On_Dispatcher_Thread()
     {
         Dispatcher.UIThread.VerifyAccess();
     }
     
-    [Fact]
-    public async Task DispatcherTimer_Works_On_The_Same_Thread()
+    [AvaloniaTheory]
+    [InlineData(1)]
+    [InlineData(10)]
+    [InlineData(100)]
+    public async Task DispatcherTimer_Works_On_The_Same_Thread(int interval)
     {
+        await Task.Delay(100);
+
         var currentThread = Thread.CurrentThread;
         var tcs = new TaskCompletionSource();
+        var hasCompleted = false;
 
         DispatcherTimer.RunOnce(() =>
         {
-            Assert.Equal(currentThread, Thread.CurrentThread);
+            hasCompleted = currentThread == Thread.CurrentThread;
 
             tcs.SetResult();
-        }, TimeSpan.FromTicks(1));
+        }, TimeSpan.FromTicks(interval));
 
-        await tcs.Task;
+        await tcs.Task; 
+        Assert.True(hasCompleted);
     }
 }

tests/Avalonia.Headless.XUnit.UnitTests/AssemblyInfo.cs

@@ -0,0 +1,7 @@
+global using Xunit;
+global using Avalonia.Headless.XUnit;
+using Avalonia.Headless;
+using Avalonia.Headless.UnitTests;
+using Avalonia.Headless.XUnit;
+
+[assembly: AvaloniaTestApplication(typeof(TestApplication))]

tests/Avalonia.Headless.UnitTests/Avalonia.Headless.UnitTests.csproj → tests/Avalonia.Headless.XUnit.UnitTests/Avalonia.Headless.XUnit.UnitTests.csproj

@@ -1,9 +1,10 @@
 <Project Sdk="Microsoft.NET.Sdk">
-
   <PropertyGroup>
     <TargetFramework>net6.0</TargetFramework>
     <IsTestProject>true</IsTestProject>
+    <DefineConstants>$(DefineConstants);XUNIT</DefineConstants>
   </PropertyGroup>
+
   <Import Project="..\..\build\UnitTests.NetCore.targets" />
   <Import Project="..\..\build\UnitTests.NetFX.props" />
   <Import Project="..\..\build\Moq.props" />
@@ -11,6 +12,10 @@
   <Import Project="..\..\build\Rx.props" />
   <Import Project="..\..\build\SharedVersion.props" />
 
+  <ItemGroup>
+    <Compile Include="..\Avalonia.Headless.UnitTests\**\*.cs" />
+  </ItemGroup>
+
   <ItemGroup>
     <ProjectReference Include="..\..\src\Avalonia.Themes.Simple\Avalonia.Themes.Simple.csproj" />
     <ProjectReference Include="..\..\src\Headless\Avalonia.Headless.XUnit\Avalonia.Headless.XUnit.csproj" />