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If a test is launched via a Rake task, it is the user's responsibility to provide code coverage measurement.

To enable rcov for test::unit run/debug configuration

It is supposed that you have a special Rake task that collects code coverage information via rcov.

  1. Open for editing your *.rake file, and add the following code: 
        require  'rcov/rcovtask'

    Rcov::RcovTask.new  do  |t|
       t.libs << "test"
       t.test_files = FileList ['test/**/*_test.rb']
       t.verbose = true
    end
  2. Create run/debug configuration for the task 'rcov' and run it with coverage.

See Also

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