# Test Coverage Tool for TDD?

**URL:** <https://discuss.rubyonrails.org/t/test-coverage-tool-for-tdd/35271>\
**Category:** rubyonrails-talk\
**Created:** [October 11, 2008, 2:40pm UTC](https://discuss.rubyonrails.org/t/test-coverage-tool-for-tdd/35271 "2008-10-11T14:40:08Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Hunt\_Jon](https://avatars.discourse-cdn.com/v4/letter/h/ea5d25/32.png) [@Hunt\_Jon](https://discuss.rubyonrails.org/u/Hunt_Jon)\
**Post date:** [October 11, 2008, 2:40pm UTC](https://discuss.rubyonrails.org/t/test-coverage-tool-for-tdd/35271/1 "2008-10-11T14:40:08Z")

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Hi,

I'm learning TDD without using Shoulda or RSpec. When I played with RSpec, there was a tool to show test coverage visually.

Is there any similar function built-in to Rails Test::Unit? Or do I need to add it on my own? What's the recommended tool?

I tried `rake -T test`, but didn't find anything about coverage.

-Jon

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**Author:** ![Jeremy\_McAnally](https://avatars.discourse-cdn.com/v4/letter/j/c89c15/32.png) [@Jeremy\_McAnally](https://discuss.rubyonrails.org/u/Jeremy_McAnally)\
**Post date:** [October 11, 2008, 3:02pm UTC](https://discuss.rubyonrails.org/t/test-coverage-tool-for-tdd/35271/2 "2008-10-11T15:02:00Z")

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Yup, it's called rcov: [http://eigenclass.org/hiki.rb?rcov](http://eigenclass.org/hiki.rb?rcov)

--Jeremy