code: def default(session, django_dep=('django',)):
      
  
      # Install all test dependencies, then install this package in-place.
      deps = UNIT_TEST_DEPS
      deps += django_dep
  
      session.install(*deps)
      for local_dep in LOCAL_DEPS:
          session.install('-e', local_dep)
      session.install('-e', '.')
  
      # Run py.test against the unit tests.
      session.run(
          'py.test',
          '--quiet',
          '--cov=google.cloud.logging',
          '--cov=tests.unit',
          '--cov-append',
          '--cov-config=.coveragerc',
          '--cov-report=',
          '--cov-fail-under=97',
          'tests/unit',
          *session.posargs
      )
docs: Default unit test session.