Run external CSS only in test mode in Ruby on Rails

Question

I have a CSS file that I want to run only in test mode, and not in development or production. I know how to do this inline as follows:

<% if Rails.env.test? &>
  <style>
    //My test only styles
  </style>
<% end %>

This works, however, I prefer to avoid inline stylesheets since they're unorganized and hard to maintain. I've tried applying it to an external stylesheet as such:

<%= stylesheet_link_tag 'my_stylesheet.css' if Rails.env.test? %>

But this only works if I add my CSS file to applications.css. And If I do this, the file gets added regardless of which environment I'm running in.

So my question is, how I can add an external stylesheet in rails that is only run while in test mode? For bonus points, how could I get rails to compile SASS that only runs in test mode?

Paul Sturgess · Accepted Answer · 2017-03-20 09:32:02Z

1

This isn't a perfect solution, but you could consider adding a class to the html or body tag in test mode and then explicitly specifying that class for your test styles.

This would give you the clean separation and maintainability benefits but the trade-off is that you would still need these to be compiled by the asset pipeline.

answered Mar 20, 2017 at 9:32

Paul Sturgess

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