Password reset test

這節要撰寫整合測試，要針對 if 述句的三個分支進行測試有效和無效的提交，第三個分支留在練習題。

為密碼重設建立一個整合測試文件：

$ rails generate integration_test password_resets
      invoke  test_unit
      create    test/integration/password_resets_test.rb

測試的步驟大致跟帳號啟動測試一樣，只是開頭不一樣，我們要先瀏覽「forgot password」表單頁面，提交無效和有效的 email，提交有效的 email 後會建立一個 reset token 接著發送重設密碼的郵件。然後我們瀏覽郵件裡的重設連結，再一次的提交無效和有效的資料，檢查每個情況的行為。

測試程式碼如下：

test/integration/password_resets_test.rb

require 'test_helper'

class PasswordResetsTest < ActionDispatch::IntegrationTest

  def setup
    ActionMailer::Base.deliveries.clear
    @user = users(:michael)
  end

  test "password resets" do
    get new_password_reset_path
    assert_template 'password_resets/new'
    # Invalid email
    post password_resets_path, password_reset: { email: "" }
    assert_not flash.empty?
    assert_template 'password_resets/new'
    # Valid email
    post password_resets_path, password_reset: { email: @user.email }
    assert_not_equal @user.reset_digest, @user.reload.reset_digest
    assert_equal 1, ActionMailer::Base.deliveries.size
    assert_not flash.empty?
    assert_redirected_to root_url
    # Password reset form
    user = assigns(:user)
    # Wrong email
    get edit_password_reset_path(user.reset_token, email: "")
    assert_redirected_to root_url
    # Inactive user
    user.toggle!(:activated)
    get edit_password_reset_path(user.reset_token, email: user.email)
    assert_redirected_to root_url
    user.toggle!(:activated)
    # Right email, wrong token
    get edit_password_reset_path('wrong token', email: user.email)
    assert_redirected_to root_url
    # Right email, right token
    get edit_password_reset_path(user.reset_token, email: user.email)
    assert_template 'password_resets/edit'
    assert_select "input[name=email][type=hidden][value=?]", user.email
    # Invalid password & confirmation
    patch password_reset_path(user.reset_token),
          email: user.email,
          user: { password:              "foobaz",
                  password_confirmation: "barquux" }
    assert_select 'div#error_explanation'
    # Empty password
    patch password_reset_path(user.reset_token),
          email: user.email,
          user: { password:              "",
                  password_confirmation: "" }
    assert_select 'div#error_explanation'
    # Valid password & confirmation
    patch password_reset_path(user.reset_token),
          email: user.email,
          user: { password:              "foobaz",
                  password_confirmation: "foobaz" }
    assert is_logged_in?
    assert_not flash.empty?
    assert_redirected_to user
  end
end

大部分的程式碼之前都有出現過，唯一這個：

assert_select "input[name=email][type=hidden][value=?]", user.email

是要確認 input 標籤有正確的名稱、類型（hidden）和 email 位址：

<input id="email" name="email" type="hidden" value="[email protected]" />

執行測試應該會通過（Green）：

$ bundle exec rake test