tests: delete PYTEST_ADDOPTS in testdir already (#655)

Author: blueyed

tests/conftest.py

@@ -34,6 +34,12 @@ def _marker_apifun(extra_settings='',
     }
 
 
+@pytest.fixture
+def testdir(testdir, monkeypatch):
+    monkeypatch.delenv('PYTEST_ADDOPTS', raising=False)
+    return testdir
+
+
 @pytest.fixture(scope='function')
 def django_testdir(request, testdir, monkeypatch):
     marker = request.node.get_closest_marker('django_project')
@@ -128,8 +134,6 @@ def create_app_file(code, filename):
     testdir.create_app_file = create_app_file
     testdir.project_root = project_root
 
-    monkeypatch.delenv('PYTEST_ADDOPTS', raising=False)
-
     testdir.makeini("""
         [pytest]
         addopts = --strict