Security-related question about a possible exposed credential

[Emma-NYL]

Hello,

My name is Emma, I am conducting an academic study on possible credential exposure in public GitHub repositories.

While analyzing this repository, I found a string that may represent a credential. I'm including the code snippet below containing possible leakage. To avoid exposing sensitive information publicly, I marked the sensitive information.

Could you please help clarify whether the detected string is:

1. a real credential, or
2. a placeholder / example value?

Thank you for your time.

---

Code snippet (sensitive values masked):

        end
      end

      context 'OAuth2 authentication' do
        before do
          email_account.encrypted_password = nil
          email_account.settings = { oauth: { access_token: "oauth****en_123" } }
          allow(email_account).to receive(:oauth_configured?).and_return(true)
        end

        it 'uses OAuth2 authentication when configured' do
          expect(processing_service).to receive(:authenticate_with_oauth).with(mock_imap)

Thank you in advance for your time - I really appreciate it!

Sincerely,
Emma