How do I test helpers in Rails?

问题:

I'm trying to build some unit tests for testing my Rails helpers, but I can never remember how to access them. Annoying. Suggestions?

回答1:

In rails 3 you can do this (and in fact it's what the generator creates):

require 'test_helper'

class YourHelperTest < ActionView::TestCase
  test "should work" do
    assert_equal "result", your_helper_method
  end
end

And of course the rspec variant by Matt Darby works in rails 3 too

回答2:

You can do the same in RSpec as:

require File.dirname(__FILE__) + '/../spec_helper'

describe FoosHelper do

  it "should do something" do
    helper.some_helper_method.should == @something
  end

end

回答3:

Stolen from here: http://joakimandersson.se/archives/2006/10/05/test-your-rails-helpers/

require File.dirname(__FILE__) + ‘/../test_helper’
require ‘user_helper’

class UserHelperTest < Test::Unit::TestCase

include UserHelper

def test_a_user_helper_method_here
end

end

[Stolen from Matt Darby, who also wrote in this thread.] You can do the same in RSpec as:

require File.dirname(__FILE__) + '/../spec_helper'

describe FoosHelper do

  it "should do something" do
    helper.some_helper_method.should == @something
  end

end

回答4:

This thread is kind of old, but I thought I'd reply with what I use:

# encoding: UTF-8

require 'spec_helper'

describe AuthHelper do

  include AuthHelper # has methods #login and #logout that modify the session

  describe "#login & #logout" do
    it "logs in & out a user" do
      user = User.new :username => "AnnOnymous"

      login user
      expect(session[:user]).to eq(user)

      logout
      expect(session[:user]).to be_nil
    end
  end

end

回答5:

I just posted this answer on another thread asking the same question. I did the following in my project.

require_relative '../../app/helpers/import_helper'