Test feed using `entr`
When you save a ruby file in that directory, the test refreshes and re-runs.
Ruby: Minitest
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ls *.rb | entr ruby *_test.rb
Ruby: RSpec
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ls lib/*.rb | entr rspec spec/*
Elixir: Mix
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ls *exs | entr mix test
JavaScript: Yarn
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ls *.js | entr yarn test