Testing render partial with nested partials in Rails helper

Question

I have a helper that looks like so:

module ActivityFeedHelper
  def render_activity_feed(activities)
    render partial: 'activities/activity_feed', locals: { activities: activities }
  end
end

I'm writing a spec for the helper that looks like:

describe ActivityFeedHelper do
  describe '.render_activity_feed' do
    let(:activities) { FactoryGirl.create_list(:activity, 3) }

    it 'should render activity feed' do
      expect(render_activity_feed(activities)).to render_template(partial: 'activities/activity_feed')
    end
  end
end

But this is giving me the error:

Failure/Error: expect(render_activity_feed(activities)).to render_template(partial: 'activities/activity_feed')                                                                                                                          
       expecting partial <activities/activity_feed> but action rendered <["activities/_activity", "_activity", "activities/_activities", "_activities", "activities/_activity_feed", "_activity_feed"]>.                                      
       Expected {"activities/_activity"=>3, "_activity"=>3, "activities/_activities"=>1, "_activities"=>1, "activities/_activity_feed"=>1, "_activity_feed"=>1} to include "activities/activity_feed".

Presumably this is happening because the partial renders multiple sub-partials.

That said, how should I be testing this?

score 2 · Accepted Answer · 2015-08-11 19:56:21Z

2

I think that I have felt into this trap too once. Your error means that you have to render template in this way:

expect(render_activity_feed(activities)).to render_template(partial: 'activities/_activity_feed')

Note the leading underscore in _activity_feed.

edited Aug 11, 2015 at 19:56

answered Aug 11, 2015 at 19:32

user4776684

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2 Comments

doremi Over a year ago

Yup - just discovered that before your post. Annoying! But thanks for your contribution.

user4776684 Over a year ago

It was all in your error message. Probably, majority of Rails errors can be solved by looking into the logs or other error output.

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