Maybe not so useful anymore, as I realized I overused this. Stubbing should only be necessary for methods that tests the download of the JSON file.

For other tests, I previously used `stub_request` too and let the `download_json` function use the stubbed fixture whereas I should have directly used `@command.json=` to pass the JSON instead (no need to install a stub then perform the network request when you can affect `@json` directly!).

This is fixed in my latests PRs.