Ruby on Rails

Rails has three modes: production, development, and testing. An
example: when you are developing an app, you may want to show the values
of certain variables on each page, i.e. the views that are displayed.
Looking at the values of those variables can help you understand where
any errors might be occurring. In production mode, you obviously don't
want values of variables being displayed a the bottom of your web page.

In your example, one gem is included in development mode(and presumably
production mode), and another gem is included for testing mode only. So
you could infer that the gem included for testing, is a gem that
provides facilities for writing tests. It should be obvious that tests
don't execute in production mode--that would slow down your app.

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