Error: UserTest#test_email_addresses_should_be_unique: ActiveModel::UnknownAttributeError: unknown attribute 'password' for User.のエラーについて

Error:
UserTest#test_email_validation_should_accept_valid_addresses:
ActiveModel::UnknownAttributeError: unknown attribute 'password' for User.
    test/models/user_test.rb:6:in `setup'


rails test test/models/user_test.rb:34

E

Error:
UserTest#test_should_be_valid:
ActiveModel::UnknownAttributeError: unknown attribute 'password' for User.
    test/models/user_test.rb:6:in `setup'


rails test test/models/user_test.rb:10

E

Error:
UserTest#test_email_should_not_be_too_long:
ActiveModel::UnknownAttributeError: unknown attribute 'password' for User.
    test/models/user_test.rb:6:in `setup'


rails test test/models/user_test.rb:29

E

Error:
UserTest#test_email_validation_should_reject_invalid_addresses:
ActiveModel::UnknownAttributeError: unknown attribute 'password' for User.
    test/models/user_test.rb:6:in `setup'


rails test test/models/user_test.rb:43

E

Error:
UserTest#test_name_should_not_be_too_long:
ActiveModel::UnknownAttributeError: unknown attribute 'password' for User.
    test/models/user_test.rb:6:in `setup'


rails test test/models/user_test.rb:24

E

Error:
UserTest#test_email_should_be_present:
ActiveModel::UnknownAttributeError: unknown attribute 'password' for User.
    test/models/user_test.rb:6:in `setup'


rails test test/models/user_test.rb:19

E

Error:
UserTest#test_name_should_be_present:
ActiveModel::UnknownAttributeError: unknown attribute 'password' for User.
    test/models/user_test.rb:6:in `setup'


rails test test/models/user_test.rb:14

E

Error:
UserTest#test_email_addresses_should_be_unique:
ActiveModel::UnknownAttributeError: unknown attribute 'password' for User.
    test/models/user_test.rb:6:in `setup'


rails test test/models/user_test.rb:52

.......

Finished in 2.014780s, 7.4450 runs/s, 8.4376 assertions/s.
15 runs, 17 assertions, 0 failures, 8 errors, 0 skips

require 'test_helper'

class UserTest < ActiveSupport::TestCase

  def setup
    @user = User.new(name: "Example User", email: "user@example.com",
                     password: "foobar", password_confirmation: "foobar")
  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" * 51
    assert_not @user.valid?
  end

  test "email should not be too long" do
    @user.email = "a" * 244 + "@example.com"
    assert_not @user.valid?
  end

  test "email validation should accept valid addresses" do
    valid_addresses = %w[user@example.com USER@foo.COM A_US-ER@foo.bar.org
                         first.last@foo.jp alice+bob@baz.cn]
    valid_addresses.each do |valid_address|
      @user.email = valid_address
      assert @user.valid?, "#{valid_address.inspect} should be valid"
    end
  end

  test "email validation should reject invalid 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
end

class User < ApplicationRecord
  validates :name, presence: true, length: { maximum: 50 }
  VALID_EMAIL_REGEX = /\A[\w+\-.]+@[a-z\d\-]+(\.[a-z\d\-]+)*\.[a-z]+\z/i
  validates :email, presence: true, length: { maximum: 255 },
                    format: { with: VALID_EMAIL_REGEX },
                    uniqueness: { case_sensitive: false }
end