如何存根WickedPdf?

时间:2017-12-19 17:14:18

标签: ruby-on-rails pdf wicked-pdf

我正在使用wicked_pdf gem,而我目前正试图加速我的规范套件。

我意识到我的一些规格在我的tmp文件夹中生成PDF,这非常耗时。

有没有办法完全存根wicked_pdf,所以它实际上不会生成PDF?

2 个答案:

答案 0 :(得分:1)

这取决于你如何使用它,以及你想在测试套件中减少多少,但可能是一个好地方WickedPdf::PdfHelper#make_pdf,你可以在RSpec测试中使用这样的东西存根:

describe MyController do
  describe '#show.pdf' do
    it 'creates a PDF'
      let(:tiny_pdf) do
        # What is the smallest possible valid PDF?
        # https://stackoverflow.com/a/17280876/23915
        "%PDF-1.4\ntrailer<</Root<</Pages<</Kids[<</MediaBox[0 0 3 3]>>]>>>>>>"
      end

      # Here is the actual stubbing
      allow(WickedPdf::PdfHelper).to receive(:make_pdf).and_return tiny_pdf

      get :show, params: { id: 1, format: :pdf }
      expect(response.status).to eq 200
    end
  end
end

或者您可以通过重新打开类并更改定义来全局覆盖它:

if Rails.env.test?
  class WickedPdf
    class PdfHelper
      def make_pdf(options = {})
        "%PDF-1.4\ntrailer<</Root<</Pages<</Kids[<</MediaBox[0 0 3 3]>>]>>>>>>"
      end
    end
  end
end

答案 1 :(得分:0)

WickedPdf::PdfHelper#make_pdf除去其他答案中的内容会阻止测试使用来渲染的内容。 expect(response).to render_template("show")

要找出导致写入文件的方法,我在expect(File).not_to receive(:open)之前临时添加了get ... format: :pdf并发现:

     Failure/Error: render pdf: "...", template: "show"

       (File (class)).open("/tmp/wicked_pdf20200304-24076-r7r1eh.html", 194, {:perm=>384})
           expected: 0 times with any arguments
           received: 1 time with arguments: ("/tmp/wicked_pdf20200304-24076-r7r1eh.html", 194, {:perm=>384})

     # /usr/local/bundle/gems/wicked_pdf-1.4.0/lib/wicked_pdf/tempfile.rb:10:in `initialize'
     # /usr/local/bundle/gems/wicked_pdf-1.4.0/lib/wicked_pdf.rb:58:in `new'
     # /usr/local/bundle/gems/wicked_pdf-1.4.0/lib/wicked_pdf.rb:58:in `pdf_from_string'
     # /usr/local/bundle/gems/wicked_pdf-1.4.0/lib/wicked_pdf/pdf_helper.rb:91:in `make_pdf'
     # /usr/local/bundle/gems/wicked_pdf-1.4.0/lib/wicked_pdf/pdf_helper.rb:113:in `make_and_send_pdf'
     # /usr/local/bundle/gems/wicked_pdf-1.4.0/lib/wicked_pdf/pdf_helper.rb:40:in `render_with_wicked_pdf'
     # /usr/local/bundle/gems/wicked_pdf-1.4.0/lib/wicked_pdf/pdf_helper.rb:30:in `render'
     # ./app/controllers/reports_controller.rb:21:in `block (2 levels) in show'
     # ./app/controllers/reports_controller.rb:11:in `show'

然后,我在回溯中的不同位置进行了存根测试,发现以下内容使测试与通常的“ html”控制器测试一样快,同时仍然允许测试render_template("show")

        it "returns http success" do
          allow_any_instance_of(WickedPdf::PdfHelper).to receive(:make_and_send_pdf)
          get :show, params: { id: 1, format: :pdf }
          expect(response).to have_http_status(:success)
        end

        it "renders the show template" do
          allow_any_instance_of(WickedPdf::PdfHelper).to receive(:make_and_send_pdf)
          get :show, params: { id: 1, format: :pdf }
          expect(response).to render_template("show")
        end

这也使得不需要返回微小的pdf。