如何在测试期间在 Helper 中存根函数

看看这个辅助函数：

def show_welcome_banner?
  (controller_name == 'competition' && action_name == 'index') ||
  (controller_name == 'submissions' && action_name == 'show')
end

它期望定义controller_name 和action_name 函数。

我尝试在我的 RSpec 匹配器中使用它：

describe PageHelper do
  it "should know when the welcome banner is to be shown" do
    helper.stub!(:controller_name).and_return('index')
    show_welcome_banner?.should == false
  end
end

但这不会真正起作用。

我如何在助手内部存根函数？也许使用instance_eval？ 谢谢！

EDIT, 尝试使用

controller.stub!(:controller_name).and_return('index')

but got

  1) PageHelper should know when the welcome banner is to be shown
     Failure/Error: show_welcome_banner?.should == false
     NameError:
       undefined local variable or method `controller_name' for #<RSpec::Core::ExampleGroup::Nested_1:0x1059a10b8>
     # ./app/helpers/page_helper.rb:16:in `show_welcome_banner?'
     # ./spec/helpers/page_helper_spec.rb:7

助手已放入规范/helper/page_helper_spec.rb..

你有没有尝试过

stub!(:controller_name).and_return('index')

似乎对我有用:)