tests: test_invalid_template_variable: use include (pytest-dev#506)

This shows issue pytest-dev/pytest#580, which is fixed in pytest 3.2.0.

Author: blueyed

tests/test_environment.py

@@ -76,7 +76,7 @@ def invalid_template(request):
  'templates/invalid_template_base.html'
  )
  django_testdir.create_app_file(
- "{% extends 'invalid_template_base.html' %}",
+ "{% include 'invalid_template_base.html' %}",
  'templates/invalid_template.html'
  )
  django_testdir.create_test_module('''