Copy all tests to a test directory under artifacts to prevent collecting coverage for multiple copies of the same assembly in multiple different areas. (Massively shrinks the coverage.xml file).

build.cake

@@ -95,6 +95,7 @@ var artifactsDir = (DirectoryPath)Directory("./artifacts");
 var nugetRoot = artifactsDir.Combine("nuget");
 var zipRoot = artifactsDir.Combine("zip");
 var binRoot = artifactsDir.Combine("bin");
+var testsRoot = artifactsDir.Combine("tests");
 
 var dirSuffix = configuration;
 var dirSuffixSkia = (isPlatformAnyCPU ? "x86" : platform) + "/" + configuration;
@@ -588,6 +589,7 @@ Task("Clean")
     CleanDirectory(nugetRoot);
     CleanDirectory(zipRoot);
     CleanDirectory(binRoot);
+    CleanDirectory(testsRoot);
 });
 
 Task("Restore-NuGet-Packages")
@@ -683,25 +685,25 @@ Task("Run-Unit-Tests")
     xUnitSettings.NoAppDomain = !isRunningOnWindows;
 
     var openCoverOutput = artifactsDir.GetFilePath(new FilePath("./coverage.xml"));
-    var openCoverSettings = new OpenCoverSettings
+    var openCoverSettings = new OpenCoverSettings()
-        {
+        .WithFilter("+[Avalonia.*]* -[*Test*]* -[ControlCatalog*]*")
-            ArgumentCustomization = openCoverArgs => openCoverArgs.AppendSwitch("-mergeoutput", "")
+        .WithFilter("-[Avalonia.*]OmniXaml.* -[Avalonia.*]Glass.*")
-        }
+        .WithFilter("-[Avalonia.HtmlRenderer]TheArtOfDev.HtmlRenderer.* +[Avalonia.HtmlRenderer]TheArtOfDev.HtmlRenderer.Avalonia.* -[Avalonia.ReactiveUI]*");
-        .WithFilter("+[Avalonia.*]* -[*Test*]*");;
+    
+    foreach(var test in unitTests)
+    {
+        CopyDirectory(test.GetDirectory(), testsRoot);
+    }
 
-    foreach (var file in unitTests)
+    if(isRunningOnWindows)
     {
-        Information("Running test " + file.GetFilenameWithoutExtension());
+        OpenCover(context => {
-        if(isRunningOnWindows)
+            context.XUnit2(unitTests.Select(test => testsRoot.GetFilePath(test).FullPath), xUnitSettings);
-        {
+        }, openCoverOutput, openCoverSettings);
-            OpenCover(context => {
+    }
-                context.XUnit2(file.FullPath, xUnitSettings);
+    else
-            }, openCoverOutput, openCoverSettings);
+    {
-        }
+        XUnit2(unitTests.Select(test => test.FullPath), xUnitSettings);
-        else
-        {
-            XUnit2(file.FullPath, xUnitSettings);
-        }
     }
 });