Rspec 3 如何测试 flash 消息

RSpec 3 中如何测试 Flash 消息

ruby
# Gemfile
group :development, :test do
  gem 'rspec-rails', '~> 3.0'
end

bash
bundle install
rails generate rspec:install

ruby
# spec/controllers/my_controller_spec.rb
require 'rails_helper'
RSpec.describe MyController, type: :controller do
  describe 'POST #create' do
    it '显示成功的Flash消息' do
      post :create, params: { my_param: 'some_value' }
      expect(flash[:notice]).to eq('操作成功！')
    end
  end
end

bash
bundle exec rspec