How to use Ruby's simplecov with non-Rails applications?

[Martin Asser Hansen]

I would like to setup simplecov on a non-Rails application, but the resulting coverage report indicates that my code is not tested, e.g. Hamming.distance is not tested, which it is?!?

I included the `require 'simplecov' and `SimpleCov.start` in this test helper:

https://github.com/maasha/biopieces/blob/master/test/helper.rb

Here is the application code:

https://github.com/maasha/biopieces/blob/master/lib/biopieces/seq/hamming.rb

And the test:

https://github.com/maasha/biopieces/blob/master/test/biopieces/seq/test_hamming.rb

I run Rake test to create the coverage report.