在test/controllers/static_pages_controller_test.rb中

require 'test_helper'

class StaticPagesControllerTest < ActionDispatch::IntegrationTest
  test "should get home" do
    get static_pages_home_url
    assert_response :success    #检测他的请求是不是成功了。
    assert_select "title", "Home | Ruby on Rails Tutorial Sample App"  #测试是不是有这个标签
  end

  test "should get help" do
    get static_pages_help_url
    assert_response :success
    assert_select "title", "  Help | Ruby on Rails Tutorial Sample App"
  end

  test "should get about" do
    get static_pages_about_url
    assert_response :success
    assert_select "title", "About | Ruby on Rails Tutorial Sample App"
  end
  
end

测试rails test