fixup! Add missing __test__ check for test discovery.

Author: decentral1se

testing/test_collection.py

@@ -91,7 +91,7 @@ def test_can_skip_class_with_test_attr(self, testdir):
             class TestFoo():
                 __test__ = False
                 def __init__(self):
-                    return self.__init__()
+                    pass
                 def test_foo():
                     assert True
         """)