A plugin for Sublime Text 2 that can highlight lines of Ruby lacking test coverage.
You will need to setup simplecov-sublime-ruby-coverage in your project.
Set up Sublime Package Control if you don't have it yet.
Go to Tools > Command Palette.
Type Package Control: Install Package and hit enter.
Type Ruby Coverage and hit enter.
Add a .covignore file to your project root in order to add custom ignores.
When you open a .rb file, SublimeRubyCoverage tries to find coverage information and highlight all uncovered lines with an outline.
It does this by looking in all parent directories
until it finds a coverage/sublime-ruby-coverage directory as produced by simplecov-sublime-ruby-coverage.
You can force a reload of the coverage information
and redraw of the outlines
by running the show_ruby_coverage command,
bound to super+shift+c by default.