Adding tests to build

Author: d4nt

appveyor.yml

@@ -10,6 +10,12 @@ build_script:
 after_build:
 - cmd: 7z a QueryTree.zip %APPVEYOR_BUILD_FOLDER%/Web/dist/*
 - cmd: 7z a QueryTree.zip %APPVEYOR_BUILD_FOLDER%/README.md
+before_test:
+- cmd: dotnet build ./Tests/Tests.csproj
+test:
+  assemblies:
+    only:
+      - ./Tests/**.dll
 artifacts:
 - path: QueryTree.zip
   name: QueryTree