I am trying to setup pact for test like:

`
Pact.service_consumer 'Authentication Service Consumer' do
  has_pact_with 'Authentication Service Provider' do
    mock_service :authentication_service_provider do
      port 1234
    end
  end
end
`

and run into an error saying

`
Failure/Error:
  mock_service :authentication_service_provider do
    port 1234
  end

RuntimeError:
  Port 1234 is already being used by Authentication Service Provider #<Pact::MockService::App:0x007f874ef487b0>
`