How do you test a Rails controller method exposed as a helper_method?

Question

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

Answer 1

I've struggled with this for a bit, because the accepted answer didn't actually test whether the method was exposed as a helper method.

That said, we can use the #helpers method to get a proxy for testing.

For example:

class FooController < ApplicationController
  private

  def bar
    'bar'
  end

  helper_method :bar
end

Can be tested with:

require 'test_helper'

class FooControllerTest < ActionController::TestCase
  test 'bar is a helper method' do
    assert_equal 'bar', @controller.helpers.bar
  end
end