old_contents: # -*- coding: utf-8 -*-
  from django_webtest import WebTestMixin
  import pytest
  
  
  class MixinWithInstanceVariables(WebTestMixin):
      """
      Override WebTestMixin to make all of its variables instance variables
      not class variables; otherwise multiple django_app_factory fixtures contend
      for the same class variables
      """
      def __init__(self):
          self.extra_environ = {}
          self.csrf_checks = True
          self.setup_auth = True
  
  
  @pytest.fixture(scope='session')
  def django_app_mixin():
      app_mixin = MixinWithInstanceVariables()
      return app_mixin
  
  
  @pytest.yield_fixture
  def django_app(django_app_mixin):
      django_app_mixin._patch_settings()
      django_app_mixin.renew_app()
      yield django_app_mixin.app
      django_app_mixin._unpatch_settings()
  
  
  @pytest.yield_fixture
  def django_app_factory():
      def factory(csrf_checks=True, extra_environ=None):
          app_mixin = MixinWithInstanceVariables()
          app_mixin.csrf_checks = csrf_checks
          if extra_environ:
              app_mixin.extra_environ = extra_environ
          app_mixin._patch_settings()
          app_mixin.renew_app()
          return app_mixin.app
  
      yield factory
  
new_contents: # -*- coding: utf-8 -*-
  from django_webtest import WebTestMixin
  import pytest
  
  
  class MixinWithInstanceVariables(WebTestMixin):
      """
      Override WebTestMixin to make all of its variables instance variables
      not class variables; otherwise multiple django_app_factory fixtures contend
      for the same class variables
      """
      def __init__(self):
          self.extra_environ = {}
          self.csrf_checks = True
          self.setup_auth = True
  
  
  @pytest.fixture(scope='session')
  def django_app_mixin():
      app_mixin = MixinWithInstanceVariables()
      return app_mixin
  
  
  @pytest.fixture
  def django_app(django_app_mixin):
      django_app_mixin._patch_settings()
      django_app_mixin.renew_app()
      yield django_app_mixin.app
      django_app_mixin._unpatch_settings()
  
  
  @pytest.fixture
  def django_app_factory():
      def factory(csrf_checks=True, extra_environ=None):
          app_mixin = MixinWithInstanceVariables()
          app_mixin.csrf_checks = csrf_checks
          if extra_environ:
              app_mixin.extra_environ = extra_environ
          app_mixin._patch_settings()
          app_mixin.renew_app()
          return app_mixin.app
  
      yield factory
  
subject: remove pytest yield_fixture functions; fixed #88