Coveralls (and other coverage sites e.g. Jenkins) are great. Knowing which code is untested helps find bugs and unused code.
miniblog.
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I really appreciate that GitHub has separate icons for pass and fail in CI. I've worked with Jenkins plugins that rely on red/green colour too much.
I'm considering setting up a Jenkins instance to work with my GitHub projects. I'm miss JUnit XML integration.
The past couple of Jenkins releases have included small CSS improvements. It's great to see Jenkins improving in this area.