Test `distribute_with_remainder` returns full amount for a single recipient

[Kingsman-99]

Description

The distribute_with_remainder function in contracts/split/src/calc.rs handles the edge case of a single recipient, but there is no dedicated unit test confirming that 100% of total is returned rather than a rounded-down value. A focused test would lock in this guarantee and catch future regressions.

Acceptance Criteria

• Add a test in contracts/split/src/calc.rs (or a new tests/calc_tests.rs) that calls distribute_with_remainder with one recipient whose ratio equals denom
• Assert the result Vec has length 1 and result[0] == total
• Test is named single_recipient_gets_full_amount
• cargo test passes

Context

• Target file: contracts/split/src/calc.rs
• No external dependencies needed — use Env::default() from soroban_sdk::testutils

[mw-ferretti]

@mw-ferretti has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi! I’d like to work on this issue. I can add the Rust test for distribute_with_remainder covering the single-recipient case and verify that the full amount is returned. I’ll also run the relevant test suite before submitting the PR.

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

[benjaminjohnsonfin-afk]

@benjaminjohnsonfin-afk has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi maintainer I would love to solve this issue

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

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Congratulations, @benjaminjohnsonfin-afk! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on August 31, 2026.

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[grantfox-oss]

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

@benjaminjohnsonfin-afk's PR #648 was approved and merged by @Kingsman-99.

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👏 Great work, @benjaminjohnsonfin-afk! Keep contributing to Stellar-split.

[drips-wave]

This issue has been completed by @benjaminjohnsonfin-afk as part of the Stellar Wave Program's 8th Wave 🥳

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