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The "Exercise: Tracking Code Coverage with Codecov" Lesson is part of the full, Creating an Open Source JavaScript Library on Github course featured in this preview video. Here's what you'd learn in this lesson:

When a library receives pull requests, code coverage of the contributions should continue to be tracked. Kent installs the codecov Node module which will automatically report coverage using the lcov report. Kent then updates the travis.yml configuration file to run the report on the after_success event. After the reports are run Kent demonstrates how to generate badges for the repository README file. Code for this exercise can be found on the FEM/09.1-report-coverage branch. - http://slides.com/kentcdodds/write-oss#/12/2

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