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Today I found out how to run your tests in a --watch fashion, with Elixir and Mix. Looking through the documentation for Mix.Task.Test you’ll find the --stale option and --listen-on-stdin. From the documentation for --stale The --stale command line option attempts to run only the test files which reference modules that have changed since the last time you ran this task with --stale. --listen-on-stdin runs tests, and then listens on stdin. It will re-run tests once a newline is received...