railstutorial ９章　NoMethodError: undefined method `[]' for nil:NilClass

前提・実現したいこと

testを行う際に、users.ymlにテストデータを入れて,setupメソッドで呼び出していたら以下のようなエラーが出てしまい、
困っています

発生している問題・エラーメッセージ

エラーメッセージ
/catch/test/integration/users_login_test.rb:9:in `setup'
/usr/local/bundle/gems/activerecord-5.2.4.2/lib/active_record/fixtures.rb:916:in `block (3 levels) in setup_fixture_accessors'
Error: test: login with incalid information(UsersLoginTest): NoMethodError: undefined method `[]' for nil:NilClass

該当のソースコード

rails5.2
test/integration/users_login_test.rb


ソースコード


require 'test_helper'

class UsersLoginTest < ActionDispatch::IntegrationTest
  # test "the truth" do
  #   assert true
  # end

  def setup
    @user = users(:michael)
  end

  
  
  

  test "login with incalid information" do
    get login_path
    assert_template 'sessions/new'
    post login_path, params: { session: { email: "", password: "" }}
    assert_template 'sessions/new'
    assert_not flash.empty?
    get root_path
    assert flash.empty?
  end

  test "login with valid information" do
    get login_path
    post login_path, params: { session: { email:    @user.email,
                                          password: 'password' } }
    assert is_logged_in?                                       
    assert_redirected_to @user
    follow_redirect!
    assert_template 'users/show'
    assert_select "a[href=?]", login_path, count: 0
    assert_select "a[href=?]", logout_path
    assert_select "a[href=?]", user_path(@user)
    delete logout_path
    assert_not is_logged_in?
    assert_redirected_to root_url
    delete logout_path
    follow_redirect!
    assert_select "a[href=?]", login_path
    assert_select "a[href=?]", logout_path,      count: 0
    assert_select "a[href=?]", user_path(@user), count: 0
  end
  
  test "login with remembering" do
    log_in_as(@user, remember_me: '1')
    assert_equal cookies['remember_token'], assigns(:user).remember_token
  end

  test "login without remembering" do
    log_in_as(@user, remember_me: '1')
    delete logout_path
    log_in_as(@user, remember_me: '0')
    assert_empty cookies['remember_token']
  end
    
end


------------------------------

test/fixtures/users.yml

# Read about fixtures at http://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html
michael:
  name: Michael Example
  email: michael@example.com
  password_digest: <%= User.digest('password') %>