Hi,

running e.g. "rake test:units:rcov" gives you a nice textual overview
and coverage percentage on the shell console.

However, even more interesting are the generated HTML pages. At the
end of the console output a line starting with
  View the full results at <file:///...>
points you to the graphical overview.

Clicking on one of the tested files in the index page gives you the
detailed analysis, showing
- Code reported as executed by Ruby
- Lines considered as run by rcov, but not reported by Ruby (e.g
  comments)
- Lines marked as not executed.

The last group even has a red background, thus giving you clear hints
on where to improve your test cases.

Klaus
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