Testing 1.9.3 Coverage
ruby ext/extconf.rb --with-ruby-include="<path to 1.9.3 source>"
make
...
>> require 'ccoverage'
>> CCoverage.start
>> require 'some_file.rb'
>> SomeFile.do_something
>> CCoverage.continuous_result
=> { "some_file.rb" => [0,1,1,nil]
>> SomeFile.do_something # again ... here's where we differ from 1.9.3
>> CCoverage.continuous_result
=> { "some_file.rb" => [0,2,2,nil] }