Allow tests to be run from Visual Studio.

Author: bgrainger

tests/SideBySide/SideBySide.csproj

@@ -25,6 +25,7 @@
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.3.0" />
     <PackageReference Include="xunit" Version="2.3.0-beta5-build3769" />
     <DotNetCliToolReference Include="dotnet-xunit" Version="2.3.0-beta5-build3769" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.3.0-beta5-build3769" />
     <!--app packages-->
     <PackageReference Include="Dapper" Version="1.50.2" />
     <PackageReference Include="Microsoft.Extensions.Configuration.Binder" Version="1.1.1" />