根据当前路径改变行为的助手的单元测试？

Question

我正在尝试在 Rails 中测试以下辅助方法：

  def current_has_class_link(text, path, class_name="selected")
    link_to_unless_current(text, path) do
      link_to(text, path, :class => class_name)
    end
  end

我正在尝试进行一个类似这样的测试：

  describe "current_has_class_link" do
    let(:link_path){ listings_path }
    let(:link_text){ "Listings" }

    it "should render a normal link if not on current path" do
      html = "<a href=\"#{link_path}\">#{link_text}</a>"
      current_has_class_link(link_text, link_path).should == html
    end

    it "should add a class if on the links path" do
      # at this point I need to force current_path to return the same as link_path
      html = "<a href=\"#{link_path}\" class=\"selected\">#{link_text}</a>"
      current_has_class_link(link_text, link_path).should == html
    end
  end

现在显然我可以为此使用集成测试，但这对我来说似乎有点过分了。有没有办法可以存根 current_page? 以便它返回我需要的内容？

我尝试这样做

ActionView::Helpers::UrlHelper.stub(current_page?({controller: 'listings', action: 'index'})).and_return(link_path)

但这给了我一个我不太理解的错误：

Failures:

  1) ApplicationHelper current_has_class_link should add a class if on the links path
     Failure/Error: ActionView::Helpers::UrlHelper.stub(current_page?({controller: 'listings', action: 'index'})).and_return(link_path)
     RuntimeError:
       You cannot use helpers that need to determine the current page unless your view context provides a Request object in a #request method
     # ./spec/helpers/application_helper_spec.rb:38:in `block (3 levels) in <top (required)>'

还有其他方法吗？

Answer 1

我遇到了同样的问题，并在测试级别将其存根。

self.stub!("current_page?").and_return(true)

Answer 2

在 Test:Unit 中，您可以使用 attr_reader 将请求设置为方法。

class ActiveLinkHelperTest < ActionView::TestCase

  attr_reader :request

  test "should render a normal link if not on current path" do
    html = "<a href=\"#{link_path}\">#{link_text}</a>"
    assert_equal html, current_has_class_link(link_text, link_path)
  end

  test "should add a class if on the links path" do
    # Path can be set.
    #   note: the default is an empty string that will never match)
    request.path = link_path

    html = "<a href=\"#{link_path}\" class=\"selected\">#{link_text}</a>"
    assert_equal html, current_has_class_link(link_text, link_path)
  end

end

Answer 3

尝试使用：

view.stub!(:current_page?).and_return(true)