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Context
First of all, apologies for the large PR. I'm happy to split it into smaller PRs if needed.
As we talked off-line, we need to start adding tests to the codebase. Although black-box tests will probably be easier to read and maintain, I wanted to make sure that we have some testing in place, even if it's not the best choice yet.
This PR adds tests that are based in testing each one of the individual tools by mocking the GitHub client. We verify that:
We have added a few simple test helper functions to try to simplify the tests a bit.