I recently wrote a functional test for an AJAX callback action. I wanted to assert that the RJS replaced some text with a particular string. This string is generated by a view helper. To keep this flexibility, I wanted to call the helper from the test.
It turns out to be quite simple. All you have to do is mix-in the helper to your TestCase class, like so:
class CompanyControllerTest < Test::Rails::TestCase
include CompanyHelper
...
end
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