Question

我想测试以下辅助模块函数：

module UploadsHelper

  def custom_img_tag(upload, width, height, id)
     if width > Upload::MAX_CROP_WIDTH
       image_tag(upload.photo.url(:original), :id => "box", :width => Upload::MAX_CROP_WIDTH, :height => (height*Upload::MAX_CROP_WIDTH/width).to_i)
     else
       image_tag(upload.photo.url(:original), :id => "box")
     end
   end

end

但是当我运行以下测试时：

describe UploadsController do
  include UploadsHelper
    describe "custom_img_tag(upload, width, height, id)" do
           before(:each) do
             @upload = Factory(:upload)
             geo = Paperclip::Geometry.from_file(@upload.photo.to_file(:original))
             @width   = geo.width
             @height  = geo.height
           end

       it "should return the original image tag for an image that is not wider than  MAX_CROP_WIDTH" do
         #custom_img_tag(@upload,@width, @heigth, "cropbox" ).should == '<img id="cropbox" width="500" height="375" src="/system/photos/10/original/avatar.jpg?1311044917" alt="Avatar" style="display: none;">'
       end
     end

我收到以下错误：

Failure/Error: custom_img_tag(@upload,@width, @heigth, "cropbox" ).should == '<img id="cropbox" width="500" height="375" src="/system/photos/10/original/avatar.jpg?1311044917" alt="Avatar" style="display: none;">'
     NoMethodError:
       You have a nil object when you didn't expect it!

为什么我会收到此错误，如何测试此方法？

更新：我将以下内容添加到spec测试文件中：

include ActionView::Helpers

产生以下错误：

NameError:
       undefined local variable or method `config' for #<RSpec

我如何摆脱这个错误，原因是什么？

感谢您的帮助。

Answer 1

我也遇到了使用Rails 3.1 RC

的错误

NameError:
   undefined local variable or method `config'

一些Rails源跟踪，我发现缺少包括ActionView :: AssetPaths。

include ActionView::AssetPaths
include ActionView::Helpers::AssetTagHelper

Answer 2

嗯，我不知道为什么会这样，但我的猜测是由于某种原因，ActionView :: Helpers不能在此规范中加载。尝试包含ActionView :: Helpers并查看是否可以修复它...问题（来自您的报告）是，当您的custom_img_tag方法被调用时，它无法调用image_tag某种原因。

无法从帮助程序模块访问image_tag

2 个答案: