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This PR replaces rcov with simplecov, which supports ruby 2, as well as 1.9.3 and 1.8.7.
Tested with (bundle exec)
rake coverage
on ruby 2.1.2 and 1.9.3.Set ENV['COVERAGE'] from the :coverage task, for backwards compatibility, though preferred way to run this would just be
COVERAGE=true bundle exec rake test
.I wasn't able to get rcov running on master, so I couldn't compare the output of simplecov with the (old) rcov output, but the simplecov output seems reasonable.