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Request: print warnings and errors more colorfully #1157

@maxjacobson

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@maxjacobson

Hello!

My team uses simplecov to enforce test coverage minimums, which means we sometimes see CI output like this:

Image

This output is saying, pretty clearly, that the build is failing because the test coverage is below our minimum. However, it doesn't really pop off the screen visually -- and sometimes our team members miss it, and are confused about why the build is failing. If these lines were printed in red, I think they would pop much better

Line coverage by file (40.00%) is below the expected minimum coverage (80.00%).
SimpleCov failed with exit 2 due to a coverage related error

What do you think?

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