text: 
  from subprocess import call
  
  import os
  
  if os.environ.get("TOXENV"):
      # normal tox run, lets jsut have tox do its job
      import tox
  
      tox.cmdline()
  elif os.environ.get("SELFINSTALL"):
      # self install testing needs some clarity
      # so its being executed without any other tools running
      call("python setup.py sdist", shell=True)
      call("easy_install dist/*", shell=True)
      import pkg_resources
  
      dist = pkg_resources.get_distribution("setuptools_scm")
      import setuptools_scm
  
      assert dist.version == setuptools_scm.get_version(), dist.version
  