【Rails7】単体テストと統合テストを行う手順

$ rails g model User name:string email:string password_digest:string
...
create  app/models/user.rb
create  test/models/user_test.rb
create  test/fixtures/users.yml
...

require "test_helper"

class UserTest < ActiveSupport::TestCase
  def setup
    @user = User.new(name: "hiroking",
                    email: "hiroking@example.com",
                    password: "hiroking",
                    password_confirmation: "hiroking"
                    )
  end

  test "name should be present" do
    @user.name = " "
    assert_not @user.valid?
  end

end

$ rails test:models

# Running:

......F

Failure:
UserTest#test_name_should_be_present [/Users/hirokirokki0820/Desktop/Ruby_on_Rails/user-authentication/test/models/user_test.rb:18]:
Expected true to be nil or false


rails test test/models/user_test.rb:16

Running 15 tests in a single process (parallelization threshold is 50)
Run options: --seed 15386

# Running:

...............

Finished in 3.174605s, 4.7250 runs/s, 8.5050 assertions/s.
15 runs, 27 assertions, 0 failures, 0 errors, 0 skips

class User < ApplicationRecord
  # email　オブジェクトが保存される時点で小文字に変換する
  before_save { self.email = email.downcase }

  # name のバリデーション
  validates :name, presence: true, length: { maximum: 25 }

  # email のバリデーション
  VALID_EMAIL_REGEX = /\A[\w+\-.]+@[a-z\d\-.]+\.[a-z]+\z/i
  validates :email, presence: true,
                    uniqueness: { case_sensitive: false },
                    length: { maximum: 105 },
                    format: { with: VALID_EMAIL_REGEX }
  
  # password のバリデーション
  has_secure_password
  validates :password, presence: true, length: { minimum: 6 }
  validates :password_confirmation, presence: true
end

require "test_helper"

class UserTest < ActiveSupport::TestCase
  def setup
    @user = User.new(name: "hiroking",
                    email: "hiroking@example.com",
                    password: "hiroking",
                    password_confirmation: "hiroking"
                    )
  end

  test "should be valid" do
    assert @user.valid?
  end

  test "name should be present" do
    @user.name = " "
    assert_not @user.valid?
  end

  test "email should be present" do
    @user.email = " "
    assert_not @user.valid?
  end

  test "name should not be too long" do
    @user.name = "a" * 100
    assert_not @user.valid?
  end

  test "email should not be too long" do
    @user.email = "a" * 255 + "example.com"
    assert_not @user.valid?
  end

  test "email validation should accept valid addresses" do
    invalid_addresses = %w[user@example,com user_at_foo.org user.name@example.
    foo@bar_baz.com foo@bar+baz.com]
    invalid_addresses.each do |invalid_address|
      @user.email = invalid_address
      assert_not @user.valid?, "#{invalid_address.inspect} should be invalid"
    end
  end

  test "email addresses should be unique" do
    duplicate_user = @user.dup
    duplicate_user.email = @user.email.upcase
    @user.save
    assert_not duplicate_user.valid?
  end

  test "email addresses should be saved as lower-case" do
    mixed_case_email = "Foo@ExAMPle.CoM"
    @user.email = mixed_case_email
    @user.save
    assert_equal mixed_case_email.downcase, @user.email
  end

  test "password should be present (nonblank)" do
    @user.password = @user.password_confirmation = " " * 6
    assert_not @user.valid?
  end

  test "password should have a minimum length" do
    @user.password = @user.password_confirmation = "a" * 5
    assert_not @user.valid?
  end

  test "password should be confirmed" do
    @user.password = "a" * 10
    @user.password_confirmation = "b"* 10
    assert_not @user.valid?
  end


end

$ rails g integration_test (テスト名)

require "test_helper"

class UsersSignupTest < ActionDispatch::IntegrationTest
# この中にテストコードを記述する
end

require "test_helper"

class UsersSignupTest < ActionDispatch::IntegrationTest

  # 新規ユーザー登録用の統合テスト
  # ユーザー登録時に（ユーザー情報が無効であるために）ユーザーが作成されないことを確認する
  test "invalid signup information" do
    get new_user_path
    # 期待値：ユーザー数の合計が変化しない（ユーザー登録に失敗）
    assert_no_difference 'User.count' do
      # users_pathに対してポストリクエストを送信する
      post users_path, params:
                      { user: { name: "",
                              email: "user@invalid",
                              password: "foo",
                              password_confirmation: "bar" } }
    end
    # エラー発生時に new_user_path をレンダリングしているかどうか
    assert_template "users/new"
  end

end

$ rails test

require "test_helper"

class UsersSignupTest < ActionDispatch::IntegrationTest
  # 新規ユーザー登録用の統合テスト
  # ユーザー登録時に（ユーザー情報が無効であるために）ユーザーが作成されないことを確認する
  test "invalid signup information" do
     
　　(省略)
　　　
  end

  # ユーザー登録時にユーザーが作成されることを確認する
  test "valid signup information" do
    get new_user_path
    # 期待値：ユーザー数の合計が＋１される（ユーザー登録に成功したのと同意）
    assert_difference 'User.count', 1 do
      post users_path, params: { user:
                    { name: 'test user',
                    email: 'test@example.com',
                    password: 'password',
                    password_confirmation: 'password' } }
    end
    assert_response :redirect
    #リダイレクト実行後に続いて別のリクエストを行う予定がある場合は、follow_redirect!を呼び出す
    follow_redirect!
    assert_response :success
    assert_template "users/show"
    # showページの指定タグ内にユーザー名が表示されているかを確認
    assert_select "p.header", "test user"
    assert_select "div.ui.card>.content>.header", "test user"
    # showページにフラッシュメッセージが表示されているかを確認
    assert_select "div.ui.message.success"
  end

end