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It has some rspec tests on key functionality. Run them with:

bundle exec rspec

Code coverage

SimpleCov and Codecov are set up to track code coverage. To see the code coverage on a local branch, run the test suite and open coverage/index.html:

open coverage/index.html

The coverage report is sent to Codecov after the tests run in CI. Once you open a PR, Codecov will post a comment with a handy coverage delta and a link to view line-by-line coverage for the PR.