Add mock files for python tests

plugins/c9.fs/mock/python/app/tests/__init.py

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+

plugins/c9.fs/mock/python/app/tests/tests.py

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+from ..user.models import User
+
+def test_user():
+    return User()

plugins/c9.fs/mock/python/app/user/__init__.py

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+

plugins/c9.fs/mock/python/app/user/models.py

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+class User():
+    def __repr__(self):
+        return '<User test>'

plugins/c9.fs/mock/python/test_user.py

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+#!/usr/bin/env python3
+from app.tests.tests import test_user
+print(test_user())