如何在 Rails 3 中使用 Cucumber/Capybara 找到页面上的图像 [英] How do I find an image on a page with Cucumber / Capybara in Rails 3

问题描述

我正在使用带有 Rails 3 的 Cucumber/Capybara 并尝试在上传后验证图像的存在.我不确定如何检查图像的 url 来验证它.

I am using Cucumber / Capybara with Rails 3 and am trying to validate the existence of an image after upload. I'm not sure how to check the url of the image to validate it.

我有以下场景:

Scenario: Create new listing
    Given I am on the new listing page
    When I fill in "listing_name" with "Amy Johnson Photography"
    And I attach the file "features/support/test_image.jpg" to "listing_images_attributes_0_photo" 

    And I press "Create"
    Then I should see "Amy Johnson Photography"
    And I should see the image "test_image.jpg"

除了最后一步，一切都通过了.

Everything passes except the last step.

我已经为我的步骤定义尝试了这个，如果它是页面上的文本，它会很好，但不适用于图像 url:

I've tried this for my step definition, which works great if it's text on the page, but doesn't for an image url:

Then /^I should see the image "(.+)"$/ do |image|
  if page.respond_to? :should
      page.should have_content(image)
    else
      assert page.has_content?(image)
    end
end

然后我也尝试了类似这个步骤定义的东西:

Then I've also tried something like this step definition instead:

Then /^I should see the image "(.+)"$/ do |image|
    html = Nokogiri::HTML(response.body)
    tags = html.xpath('//img[@src="/public/images/foo.png"]')
    # tags.length.should eql(num_of_images)
end

导致以下错误:

And I should see the image "test_image.jpg"                                                    # features/step_definitions/listing_steps.rb:41
      undefined method `body' for nil:NilClass (NoMethodError)
      ./features/step_definitions/listing_steps.rb:42:in `/^I should see the image "(.+)"$/'
      features/manage_listings.feature:24:in `And I should see the image "test_image.jpg"'

我假设您需要一个 nokogiri 步骤才能正确找到它.或者如果有更好的方法，我愿意接受建议.如何验证我刚刚上传的图片是否在页面上?谢谢.

I'm assuming you need a nokogiri step to find this properly. Or if there's a better way, I'm open to suggestions. How can I validate that the image I just uploaded is on the page? Thanks.

推荐答案

Nokogiri 的解决方案应该可以正常工作.唯一的问题是 Cabybara API 与 Webrat 不同，因此您必须使用 page.body 而不是 response.body.

The solution with Nokogiri should work fine. The only problem is that the Cabybara API is different to Webrat, so instead of response.body, you must use page.body.

但还有一种更好的方法来使用 Cabybara 测试图像:

But theres an even better way to test for the image with Cabybara :

Then /^I should see the image "(.+)"$/ do |image|
    page.should have_xpath("//img[@src="/public/images/#{image}"]")
end

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