TODO:
- tests for our rake task: https://robots.thoughtbot.com/test-rake-tasks-like-a-boss https://gumroad.com/l/testing-rails/?utm_campaign=ad&utm_medium=referral&utm_source=robots.thoughtbot.com&utm_term=https%3A%2F%2Frobots.thoughtbot.com%2Ftest-rake-tasks-like-a-boss Fix the test.
Some clues:
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https://robots.thoughtbot.com/how-to-stub-external-services-in-tests
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add a new table Author to link our author (and check if author already exists...)