Github user tliron commented on a diff in the pull request:

    https://github.com/apache/incubator-ariatosca/pull/183#discussion_r126884604
  
    --- Diff: .travis.yml ---
    @@ -23,11 +23,12 @@ env:
     - TOX_ENV=py26e2e
     - TOX_ENV=py27ssh
     - TOX_ENV=py26ssh
    +- TOX_ENV=docs
     install:
       - pip install --upgrade pip
       - pip install --upgrade setuptools
       - pip install tox
     script:
       - pip --version
       - tox --version
    -  - tox -e $TOX_ENV
    +  - PYTEST_PROCESSES=1 tox -e $TOX_ENV
    --- End diff --
    
    -1, because actually the name of the xdist argument is `--numprocesses`. 
Actually, it makes sense: the way xdist works is exactly by creating boxed 
subprocesses.


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