Enable tests on appveyor (#252)

* adding tests to appveyor's execution

* add build related files to the solution tree

strying to restore everything prior to running to see if it helps

strying PS approach

SourceLink.sln

@@ -1,6 +1,6 @@
 Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio 15
-VisualStudioVersion = 15.0.26403.7
+VisualStudioVersion = 15.0.26730.12
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{876D3926-2BE5-40B4-B9D4-1218875A3870}"
 	ProjectSection(SolutionItems) = preProject
@@ -45,6 +45,12 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Embed", "Embed", "{CB177CE6
 EndProject
 Project("{D954291E-2A0B-460D-934E-DC6B0785DB48}") = "SourceLink.Shared", "SourceLink.Shared\SourceLink.Shared.shproj", "{B1B7304A-FB72-435B-920F-B2DC53DA6054}"
 EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "build", "build", "{853D5303-E7E6-48D5-A480-BB5B34BC9B06}"
+	ProjectSection(SolutionItems) = preProject
+		appveyor.yml = appveyor.yml
+		build.ps1 = build.ps1
+	EndProjectSection
+EndProject
 Global
 	GlobalSection(SharedMSBuildProjectFiles) = preSolution
 		SourceLink.Embed.Shared\SourceLink.Embed.Shared.projitems*{083cd576-0be4-4aac-86d8-00e50c660759}*SharedItemsImports = 13
@@ -188,4 +194,7 @@ Global
 		{CB177CE6-ADA8-4017-B5B3-579B72B67B2A} = {07737978-28A8-42A2-A240-A66EF5EC4C5E}
 		{B1B7304A-FB72-435B-920F-B2DC53DA6054} = {07737978-28A8-42A2-A240-A66EF5EC4C5E}
 	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {7623516C-0410-449C-9EFC-84B884102D70}
+	EndGlobalSection
 EndGlobal

appveyor.yml

@@ -1,13 +1,28 @@
 image: Visual Studio 2017
+
 init:
   - git config --global core.autocrlf input
   - '"C:\Program Files (x86)\Microsoft Visual Studio\Installer\vswhere.exe"'
+
 clone_depth: 10
+
+before_build:
+  - cmd: dotnet restore .\SourceLink.sln
+
 build_script:
   - ps: |
       dotnet --version
       .\build.ps1
       if ($lastexitcode -ne 0){ exit $lastexitcode }
-test: off
+
+test:
+  assemblies:
+    only:
+      - '**\Tests.dll'
+
+
+test_script:
+    - ps: dotnet test .\Tests\Tests.csproj  
+
 artifacts:
   - path: bin\*.nupkg