Execute output code in integration tests

[clavedeluna]

Overview

This PR implements a simple API to run during testing that will execute a codemod's output code

Description

We want to have more confidence that the code changes we make actually do work. Executing the code during integration tests will ensure not only imports work but also functions run. Some of the ramifications of that are:

• our testing environment has to have any external lib in any output code
• integration tests are going to take longer. They will also execute code: such as making requests, serializing, etc. Whatever the output code is, that will run. We're ok with time cost and risk for now since we consider it minimal risk for the benefit of validating our code
• I had to fix some integration tests to call real imports and to fix any errors that may happen from execution which are expected (like making a request to a bogus url, we don't care about that).
• I did handle at a codemod by codemod basis exceptions that are expected. Doing it this way means we're ok catching a FileNotFound error for a codemod that has open(...)... call which we expect if we try to open a file that doesn't exist, but not catch it in other codemods in case that is a legitimate error.
• In the long term we may want to also call execute_code in unit tests so I left its API flexible for either path or code str.

[drdavella]

This is awesome. Eventually we can have more sophisticated behavioral assertions if we want, but this is exactly what we need right now.

[drdavella]

This is super cool.

[drdavella]

@clavedeluna it looks like there's maybe some kind of version/compatibility issue with jwt causing the tests to fail but once that's fixed we should be good.

[clavedeluna]

I had blindly added jwt to requirements without realizing what we want is Pyjwt:

[codecov]

Codecov Report

Merging #68 (f380fd6) into main (db09667) will not change coverage.
The diff coverage is n/a.

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##             main      #68   +/-   ##
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  Coverage   95.86%   95.86%           
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  Files          46       46           
  Lines        1694     1694           
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  Hits         1624     1624           
  Misses         70       70