Implement Integration Test for Maximum Streak Scenario

[popsman01]

Description
Validate the 4 plus win path and confirm the 10x multiplier is applied correctly at the cap.

Motivation
Tests are the primary safety net for the Tossd contract. Without coverage for this area, regressions can go undetected and break game fairness or fund safety guarantees.

Requirements and context

• Must be secure, tested, and documented
• Should be efficient and easy to review
• Primary files: Tossd-contract/src/lib.rs

Proposed Solution
Complete the following in a focused PR off feature/integration-max-streak:

• Write capped-streak integration test
• Verify repeated wins use the 10x multiplier
• Document multiplier cap behavior

Technical Implementation

Files to modify:

• coinflip-contract/src/lib.rs

Implementation steps:

• Write capped-streak integration test
• Verify repeated wins use the 10x multiplier
• Document multiplier cap behavior

Branch: feature/integration-max-streak

Example commit message

test: add integration coverage for maximum streak scenario

Acceptance Criteria

• Run tests
• Cover edge cases
• Include test output and flow notes

Guidelines

• Assignment required before starting
• PR description must include: Closes #154

[drips-wave]

This issue has been added to the Stellar Wave Program and is worth 200 Points.

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[Kanasjnr]

@Kanasjnr has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

I’d like to take this on. I’ll write an integration test that simulates consecutive wins up to and beyond the cap, asserting that once the streak hits 4+, the multiplier is fixed at 10x and doesn’t increase further.

I’ll verify payout correctness across transitions (pre-cap → capped) and ensure no overflow or miscalculation in reward logic. I’ll also document the cap behavior clearly so it’s unambiguous for integrators.

Kindly assign this to me.

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