title: Getting error ImportMismatchError while running py.test
body: <p>When I am running tests locally its working fine, but after creating the docker and running inside the container I am getting below error.</p>
  
  <pre><code>    /usr/local/lib/python3.5/site-packages/_pytest/config.py:325: in _getconftestmodules
      return self._path2confmods[path]
  E   KeyError: local('/apis/db/tests')
  
  During handling of the above exception, another exception occurred:
  /usr/local/lib/python3.5/site-packages/_pytest/config.py:356: in _importconftest
      return self._conftestpath2mod[conftestpath]
  E   KeyError: local('/apis/db/tests/conftest.py')
  
  During handling of the above exception, another exception occurred:
  /usr/local/lib/python3.5/site-packages/_pytest/config.py:362: in _importconftest
      mod = conftestpath.pyimport()
  /usr/local/lib/python3.5/site-packages/py/_path/local.py:680: in pyimport
      raise self.ImportMismatchError(modname, modfile, self)
  
  _pytest.config.ConftestImportFailure: ImportMismatchError('conftest', '/projects/my_project/db/tests/conftest.py', local('/apis/db/tests/conftest.py'))
  </code></pre>
  
  <p>/apis - its the WORKDIR in Dockerfile.</p>