Add testcase to have clean exit status

Author: pelme

tests/test_django_settings_module.py

@@ -119,7 +119,14 @@ def pytest_configure():
                 os.environ.setdefault('DJANGO_SETTINGS_MODULE',
                                       'tpkg.settings_ds')
     """)
+
+    testdir.makepyfile("""
+        def test_anything():
+            pass
+    """)
+
     r = testdir.runpytest_subprocess()
+    r.assert_outcomes(passed=1)
     assert r.ret == 0