Add tests for remaining pause/resume edge cases

[ogazboiz]

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Description

The contract test suite has 6 pause/resume tests but several important edge cases are still missing that could hide bugs in pause-time accounting.

Missing Test Cases

• test_withdraw_while_paused_claims_only_pre_pause_accrual — withdraw during pause gets only elapsed-before-pause tokens
• test_multiple_pause_resume_cycles_accumulate_correctly — total accrual after 3 pause/resume cycles equals sum of active periods
• test_cancel_while_paused_refunds_correctly — cancel on a paused stream refunds unstreamed portion
• test_top_up_while_paused_extends_stream — top-up while paused should extend end_time correctly
• test_pause_at_stream_end_time_fails — cannot pause a stream that has already expired

Files

• contracts/stream_contract/src/test.rs

Acceptance Criteria

• All 5 tests pass
• cargo test clean
• No existing tests broken

[overprodigy]

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

I'd liek to work on this.

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Congratulations, @overprodigy! 🎉 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 @overprodigy as part of the Stellar Wave Program's 4th Wave 🥳

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