[Contracts] Tests: Unit Testing for compound virtual yield math

[ONEONUORA]

Description

Write detailed contract tests validating interest calculations:

• Simulate ledger block/time steps.
• Compare smart contract outputs against analytical expected value.
• Test boundaries like extremely small/large deposits.

Acceptance Criteria

• Validates rounding behavior.
• Covers multiple simulated years.
• Zero error accumulation.

[Ayinkx1]

@Ayinkx1 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi i would like to work on this issue

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Ayinkx1 to this issue.

[drips-wave]

Congratulations, @Ayinkx1! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

🧑‍💻 @Ayinkx1: 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.

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