Cannot use variables in test assemblies paths

Author: JakeGinnivan

appveyor.yml

@@ -25,9 +25,7 @@ build_script:
 
 test:
   assemblies:
-    - GitVersionExe.Tests\bin\$(Configuration)\GitVersionExe.Tests.dll
-    - GitVersionCore.Tests\bin\$(Configuration)\GitVersionCore.Tests.dll
-    - GitVersionTask.Tests\bin\$(Configuration)\GitVersionTask.Tests.dll"
+    - **\*.Tests.dll
 
 deploy:
   - provider: NuGet