Fixed pytest ini to include default test discovery patterns

pytest.ini

@@ -1,6 +1,6 @@
 [pytest]
-python_files = test_*.py tests_*.py spec*.py
-python_functions = *_test should_*
+python_files = test_*.py tests_*.py spec*.py *_test.py
+python_functions = test_* *_test should_*
 
 # This tests should be run separately, not inside unit testing suite
 norecursedirs = integration_tests/*