Add unit tests for stream creation edge cases

[ogazboiz]

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Description

The contract test suite covers initialization and fee config but has minimal coverage for stream creation. Edge cases in create_stream() are untested and could hide subtle bugs.

Test Cases Needed

• test_create_stream_minimum_amount — minimum viable deposit
• test_create_stream_minimum_duration — single ledger duration
• test_create_stream_max_i128_amount — overflow guard
• test_create_stream_invalid_token — non-SAC token address
• test_create_stream_self_stream — sender == recipient
• test_create_stream_zero_rate — amount too small for duration
• test_stream_id_uniqueness — two streams between same parties

Files

• contracts/stream_contract/src/test.rs

Acceptance Criteria

• All listed tests added and passing
• cargo test passes clean

[KayProject]

@KayProject has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

Hi maintainer can I work on this

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[ussyalfaks]

@ussyalfaks has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

I'd love to work on this issue

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Congratulations, @ussyalfaks! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on April 29, 2026.

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[drips-wave]

This issue has been completed by @ussyalfaks as part of the Stellar Wave Program's 4th Wave 🥳

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