Use `cov-mark` when testing specific conditions

[0xGeorgii]

Refs:

• https://github.com/rust-lang/rust-analyzer/blob/master/docs/book/src/contributing/style.md#marked-tests
• https://github.com/matklad/cov-mark

[drips-wave]

This issue has been added to the Stellar Wave Program and is worth 100 Points.

🧑‍💻 Interested in contributing? Apply to work on this issue on Drips Wave, earn points, and receive rewards.

🤠 Repo maintainers: You can manage this issue's Points and Complexity on your Maintainer Dashboard here. Please keep an eye on applications and respond quickly 💙

ℹ️ Learn more about Drips Wave

[kaankacar]

@kaankacar has applied to work on this issue as part of the Stellar Wave Program's 1st wave.

I'd like to work on this issue since this is my first wave and I'd like to start out with a "good first issue"!

ℹ️ Repo Maintainers: To accept this application, review their application or assign @kaankacar to this issue.

[drips-wave]

Congratulations, @kaankacar! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on January 31, 2026.

🧑‍💻 @kaankacar: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

⚠️ Important: When opening a PR, please link it to this issue to ensure it gets tracked accurately.

🤠 Repo maintainers: Please keep an eye on the contributor's progress and review their work before the due date. You can manage this issue, including adjusting its complexity and points, here.

🌊 Happy Wave 🌊

[0xGeorgii]

Read this before starting any work: https://github.com/Inferara/inference/blob/main/CONTRIBUTING.md

[drips-wave]

This issue has been marked as completed by a Drips Wave moderator for @kaankacar as part of the Stellar Wave Program's 1st Wave 🥳

Moderator's reason: Substantial work has been submitted in PR #110, but was not reviewed/merged within the Wave.

😎 @kaankacar: You earned 100 Points for completing this issue! After the current Wave ends, you'll be eligible for a percentage of the Wave's reward pool based on the percentage of total points you've earned. Learn more here.

🧑‍💻 Repo maintainers: How'd the contributor do? If you like, you can reward them with additional points by making a compliment within seven days after the Wave Program's current wave ends.

ℹ️ Note: This issue was marked complete via moderation. Points were issued even though the GitHub issue remains open.