Fix Failing Core Tests

[JamesEjembi]

Task

Fix all failing core library tests.

Scope

• Fix test assertions
• Add missing test cases
• Mock external deps
• Fix flaky tests

Acceptance Criteria

• All tests pass
• Core functionality tested
• No flaky tests

[zinodict121]

I would like to work on this issue.

[github-actions]

@zinodict121 has been assigned to this issue! 🎉

You can now start working on it. Good luck!

[grantfox-oss]

🦊 GrantFox — @zinodict121 has been assigned to this issue as part of the Third Campaign campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #149)
2. Your PR will be reviewed by the VeriNode-Labs maintainers

Good luck! Track your progress on GrantFox.