cover-up: a dynamic coverage tool for Ruby code

Usage:

  gem "cover-up"
  require "cover-up"
  
  results = coverage(:include => "app/*/**.rb") do
    run_tests
  end
  
  results # this now contains coverage results based on the input pattern filter, and the Ruby code being executed
  
You can also optionally run your own logger inside the code coverage execution, for example:

  logger = Proc.new do |event, file, line, id, binding, klass|
    puts "#{file} (#{line}): #{event}"
    end

    results = coverage(:include => "app/*/**.rb", :logger => logger) do
    run_tests
    end

This will print out trace logging information from the code coverage run to the console, similar to the following:

/path/cover-up/tests/../lib/cover-up.rb (89): line
/path/cover-up/tests/coverage_tests.rb (127): line
/path/cover-up/tests/coverage_tests.rb (144): call
/path/cover-up/tests/coverage_tests.rb (145): line
/path/cover-up/tests/coverage_tests.rb (146): return

You can of course log the information in any way you'd like, by writing a custom logger handler and passing that into 
the code coverage options.