Fix Failing Backend Tests

[JamesEjembi]

Task

Fix all failing unit and integration tests.

Scope

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

Acceptance Criteria

• All tests pass
• Test coverage meets threshold
• 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 #221)
2. Your PR will be reviewed by the VeriNode-Labs maintainers

Good luck! Track your progress on GrantFox.

[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Third Campaign campaign!

@zinodict121's PR #232 was approved and merged by @JamesEjembi.

🏆 @zinodict121: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (809 total points). Track your full progress on GrantFox.

👏 Great work, @zinodict121! Keep contributing to VeriNode-Labs.