Dart unit test doesn't work with wrapper content

I have test units written using a library test: '>=0.12.1 <0.13.0'

. When I try to run tests with Dartium it works fine, but using content wrapper it throws an error.

pub run test test/unit -p content-shell
Failed to start content shell: Bad state: Stream has already been listened to..

      

        
        
        
      

    

I am using ubuntu computer and the content wrapper is in the path.