Can’t read app.config in C# .NET Core unit test project with ConfigurationManager

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Looking through the github issue’s comments, I found a work around that can go in the msbuild file…

<Target Name="CopyCustomContent" AfterTargets="AfterBuild">
  <Copy SourceFiles="app.config" DestinationFiles="$(OutDir)\testhost.dll.config" />
</Target>

This makes it easier to verify existing tests under .NET Core before porting the configuration data over to json configuration files.

Edit

If running under Resharper, the previous answer doesn’t work as Resharper proxies the assembly, so you need

<Target Name="CopyCustomContent" AfterTargets="AfterBuild">
  <Copy SourceFiles="app.config" DestinationFiles="$(OutDir)\ReSharperTestRunner64.dll.config" />
</Target>

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