enable .NET Core tests

Author: michael-damatov

Sources/LambdaConverters.Wpf/Properties/AssemblyInfo.cs

@@ -6,7 +6,7 @@
 // associated with an assembly.
 [assembly: AssemblyTrademark("")]
 [assembly: AssemblyCulture("")]
-[assembly: AssemblyCopyright("© 2017 Michael Damatov, Dimitri Enns.")]
+[assembly: AssemblyCopyright("© 2017-2020 Michael Damatov, Dimitri Enns, Alex Helms.")]
 
 // Setting ComVisible to false makes the types in this assembly not visible
 // to COM components.  If you need to access a type in this assembly from

Sources/Tests.LambdaConverters.Wpf/AssemblyInfoTests.cs

@@ -2,7 +2,6 @@
 using System.Diagnostics.CodeAnalysis;
 using System.Linq;
 using System.Reflection;
-using JetBrains.Annotations;
 using LambdaConverters;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 using Tests.Shared;

Sources/Tests.LambdaConverters.Wpf/Tests.LambdaConverters.Wpf.csproj

@@ -20,6 +20,7 @@
 
   <ItemGroup>
     <PackageReference Include="JetBrains.Annotations" Version="11.0.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.4.0" />
     <PackageReference Include="MSTest.TestAdapter" Version="2.0.0" />
     <PackageReference Include="MSTest.TestFramework" Version="2.0.0" />
   </ItemGroup>