Exercises

撰寫整合測試，用 get 去瀏覽 Sign up 頁面，確認這個頁面有正確的標題

在 test/test_helper.rb 導入 ApplicationHelper，就能在測試使用 full_title 輔助方法：

ENV['RAILS_ENV'] ||= 'test'
.
.
.
class ActiveSupport::TestCase
  fixtures :all
  include ApplicationHelper
  .
  .
  .
end

然後可以在 test/integration/site_layout_test.rb 檢查頁面的標題：

require 'test_helper'

class SiteLayoutTest < ActionDispatch::IntegrationTest

  test "layout links" do
    get root_path
    assert_template 'static_pages/home'
    assert_select "a[href=?]", root_path, count: 2
    assert_select "a[href=?]", help_path
    assert_select "a[href=?]", about_path
    assert_select "a[href=?]", contact_path
    get signup_path
    assert_select "title", full_title("Sign up")
  end
end

這樣做有個缺點，如果共用的標題有錯字，測試其實無法發現，所以可以為 full_title 輔助方法建立一個測試，專門用來測試 ApplicationHelper。

把下面的 FILL_IN 改成具體的程式碼：

test/helpers/application_helper_test.rb

require 'test_helper'

class ApplicationHelperTest < ActionView::TestCase
  test "full title helper" do
    assert_equal full_title,         FILL_IN
    assert_equal full_title("Help"), FILL_IN
  end
end

assert_equal 方法透過 == 檢查兩個值是否相等。