问Rails RSpec中未定义的方法“`create”

EN

scenario 'User signs in' do
  create :user, email: 'test@example.com', password: 'testpassword'
  visit '/users/sign_in'

  fill_in 'Email', with: 'test@example.com'
  fill_in 'Password', with: 'testpassword'
end

Failure/Error: create :user, email: 'test@example.com', password: 'testpassword'
 NoMethodError:
   undefined method `create' for #<RSpec::ExampleGroups::UserSignIn:0x007fe6324816b8>