code: def unit(session):
      
  
      # Testing multiple version of django
      # See https://www.djangoproject.com/download/ for supported version
      django_deps_27 = [
          ('django==1.8.19',),
          ('django >= 1.11.0, < 2.0.0dev',),
      ]
  
      if session.virtualenv.interpreter == '2.7':
          [default(session, django_dep=django) for django in django_deps_27]
      else:
          default(session)
docs: Run the unit test suite.