[TESTING & QA] Test edge case: maximum credit amount limits

[dev-fatima-24]

Priority: medium

Description

The system must handle attempts to mint, list, purchase, or retire amounts that exceed system limits (e.g., u64 max value, or business-defined maximums). Tests must verify that these edge cases return appropriate errors rather than panicking or overflowing.

Acceptance Criteria

• Minting u64::MAX credits is handled gracefully (returns an error or succeeds as designed)
• Purchasing more credits than listed returns InsufficientLiquidity
• Retiring more credits than owned returns InsufficientCredits
• Listing 0 credits returns ZeroAmountNotAllowed
• All edge case tests pass in the Rust test suite

[Tboy123-emm]

@Tboy123-emm has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

hello please i'd like to work on this issues

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[BYTES-TECHES]

@BYTES-TECHES has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hiii, Good Morning Ser I love your product and I would love to solve this issue

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[Timothy2025-20]

@Timothy2025-20 has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hi team, am a software engineer with her of experience and I would love to address and resolve this issue if assigned to me. Thank you 🙏

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[drips-wave]

Congratulations, @Timothy2025-20! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

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