tsemple/test/controllers/topics_controller_test.rb

require 'test_helper'

class TopicsControllerTest < ActionController::TestCase
  test "should get index page" do
    3.times { create(:topic) }
    get :index
    assert_response :success, @response.body
  end

  test "should get new page" do
    assert_require_logined do
      get :new
    end
    assert_response :success, @response.body
  end

  test "should create topic" do
    assert_difference "Topic.count" do
      assert_require_logined do
        post :create, topic: { title: 'Title', posts_attributes: [ content: 'Content' ] }
      end
    end
    topic = Topic.last
    assert_equal 'Title', topic.title
    assert_equal 'Content', topic.posts.first.content
    assert_redirected_to topic
  end
end