Simplify doble mock in helper tests

[facundobatista]

There are several tests in test_helpers.py that uses a double mock to mimick hitting the web to download scripts.

It's kind of cumbersome, it could be simplified to a self._mock_urlopen helper or something

[SreeCharan1234]

ok i want to contribute in it

[SreeCharan1234]

@facundobatista i have clone the this reposetry and studied the topic of Urllib module can i start working on it

[facundobatista]

Sure, go for it!

[facundobatista]

Note that tools evolved; probably there is a better way that was suggested in the description