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I have a web application in Ruby on Rails which uses the wicked_pdf gem to render a PDF. A week ago the PDF rendering failed and my test suite running didn't show because a test was missing. The opened PDF above opens in a new tab so I want to test the PDF opening itself to be correctly rendering.

I actually am able to run cucumber tests for the click on the PDF link (which renders in a new tab) and double check that on the initial page shows a certain phrase. But if I want to check Then I should see "string_on_pdf" this fails. Probably the test suite is running the code not in the new tab with the PDF opened.

So my questions:

  1. Is there a way in cucumber integration test to switch tabs to the PDF?
  2. Can I then test for content with Then I should see on the PDF?

As requested in the comments I am adding the controller action of the show action:

def show
    load_out_invoice
    if @out_invoice.nil?
      redirect_to not_found_path
    else
      @title = "#{t('titles.out_invoices.show')} #{@out_invoice.number}"
      respond_to do |format|
        format.html
        format.pdf do
          @current_user = current_user
          @out_invoice.archived = true if params[:temporary_archived]=="1"
          render template: "home/out_invoices/pdf.html.erb",
                 pdf: @out_invoice.pdf_name,
                 encoding: 'utf-8'
        end
      end
    end
  end
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  • stackoverflow.com/questions/53099223/…, stackoverflow.com/questions/59585872/…, or stackoverflow.com/questions/41480782/pdf-reader-cucumber-ruby might help. Many people seem to recommend the pdf-inspector gem provided by prawn. If you are rendering directly to the browser, e.g. send_data you might want to refactor, so that you can directly test the "render to string" output. Commented Sep 15 at 20:35
  • 1
    Please note your question is incomplete since we have no means of determining how you are generating or distributing the PDF. Commented Sep 15 at 20:37
  • @engineersmnky what exactly do you mean? I have a rails application using the wicked_pdf gem for serving pdfs directly from a controller action because format is specified ".pdf" Commented Sep 17 at 22:15
  • I mean add the controller action to the post. Show us how you are serving the PDF. You said "if I want to check Then I should see "string_on_pdf" this fails", you should add the failed step. A MRE is invaluable. Commented Sep 18 at 2:07
  • I think now I understand @enigineersmnky. Basically an attribute of the object being rendered on PDF has value "string_on_pdf" which should get rendered normally on the pdf. I will also look at pdf-inspector. Thanks for the tip! Commented Oct 14 at 9:36
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