您如何测试公开为helper_method的Rails控制器方法? [英] How do you test a Rails controller method exposed as a helper_method?

问题描述

似乎无法从ActionView :: TestCase访问它们

They don't seem to be accessible from ActionView::TestCase

推荐答案

是的，辅助方法未在视图测试中公开-但可以在功能测试中对其进行测试.并且由于它们是在控制器中定义的，因此这是测试它们的正确位置.您的辅助方法可能定义为private，因此您必须使用Ruby元编程来调用该方法.

That's right, helper methods are not exposed in the view tests - but they can be tested in your functional tests. And since they are defined in the controller, this is the right place to test them. Your helper method is probably defined as private, so you'll have to use Ruby metaprogramming to call the method.

app/controllers/posts_controller.rb:

app/controllers/posts_controller.rb:

class PostsController < ApplicationController

  private

  def format_something
    "abc"
  end
  helper_method :format_something
end

test/functional/posts_controller_test.rb:

test/functional/posts_controller_test.rb:

require 'test_helper'

class PostsControllerTest < ActionController::TestCase
  test "the format_something helper returns 'abc'" do
    assert_equal 'abc', @controller.send(:format_something)
  end
end

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