> And so in Ruby, we use test frameworks with advanced mocking, as well as runtime-reflection coverage measurement.

No matter how many times you say it, that doesn't make it true.

Care to elaborate?

I think he means that you seem to be speaking for all of the Ruby community (that is, people who write Ruby code). I've personally seen that not all of the Ruby community writes tests, because I've seen Ruby code that doesn't have tests. In fact, I've had coworkers who work with Ruby in multiple jobs in different industries, and in all cases the Ruby application had very few or no tests.