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rcov is a code coverage tool for Ruby I originally wrote 2 years ago. It improves on the better known coverage in a number of points:

• 20-300 times faster
• more accurate coverage information through code linkage inference using simple heuristics
• slightly more convenient interface (arguably; work on this is probably needed)
• additional features like bogo-profile mode, colorblind-safeness...

Code coverage shouldn't be abused (in few words, C0 coverage guarantees nothing) but it's still useful for testing: it will at least tell you when your tests need more work, and most importantly where.

What does it look like?

Just use rcov to run your program (instead of Ruby), and a number of XHTML files with the code coverage information will be generated.

For example, given

srand(0)
c = 0
d = 1
10.times do |i|
  if rand % (i + 10)
    c += i
    d += 1
  end
end
puts "blergh"
if c > 4*d
  # stuff
  puts "yep"
else
  puts "nope"
  # more stuff
end

puts "Done: #{c+d}"

you'll get something resembling