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This issue is best described in xUnit bug 9696.
The problem lies in the runner setting up the AppDomain without a config file, which causes the System.Uri constructor to throw an exception. A workaround is to include an App.Config file.
The xUnit standalone runner has been updated to fix this issue here.
The problem lies in the runner setting up the AppDomain without a config file, which causes the System.Uri constructor to throw an exception. A workaround is to include an App.Config file.
The xUnit standalone runner has been updated to fix this issue here.