Remembering functional testing in Rails....

index.html.erb

<h1>Welcome#index</h1>
<p>Find me in app/views/welcome/index.html.erb</p>
<p>Hello <%= @first_name %> <%= @last_name %></p>

welcome_controller.rb

class WelcomeController < ApplicationController
  def index
    @first_name = params[:first_name]
    @last_name  = params[:last_name]
  end
end

welcome_controller_test.rb

require 'test_helper'
require 'hpricot'

class WelcomeControllerTest < ActionController::TestCase
  test "should get index" do
    # pass a first name and last name
    get :index, {first_name: 'Chris', last_name: 'S'}
    # expect HTTP OK
    assert_response :success, 'Expected HTTP 200'
    # expect instance variable assignment
    assert_not_nil assigns(:first_name), 'Expected first name to be set'
    assert_not_nil assigns(:last_name), 'Expected last name to be set'
    
    # parse the response with hpricot and insure the markup was ok
    doc = Hpricot.parse(@response.body)
    assert_equal 'Hello Chris S', (doc/:p).last.to_plain_text.strip, 'Expected Hello Chris S'
  end

end