Add a test for a subclass of Authentication
user
```ruby
RSpec.describe AuthUseridPassword do
  describe ".encrypted_columns" do
    it "returns the encrypted columns" do
      expected = %w(password password_encrypted auth_key auth_key_encrypted service_account service_account_encrypted)
      expect(described_class.encrypted_columns).to match_array(expected)
    end
  end
end
```
assistant