Enable tests.

appveyor.yml

@@ -1,7 +1,6 @@
 clone_depth: 1
 version: '{branch}-{build}'
 image: Visual Studio 2019
-test: off
 before_build:
   - ps: dotnet --info # Useful when version mismatch between CI and local
   - ps: nuget restore -verbosity quiet # Only nuget.exe knows both new (.NET Core) and old (Xamarin) projects
@@ -9,3 +8,8 @@ build:
   project: osu.sln
   parallel: true
   verbosity: minimal
+test:
+  assemblies:
+    except:
+      - '**\*Android*'
+      - '**\*iOS*'