Add comprehensive unit tests for `init_escrow`

[meshackyaro]

Description

This issue aims to address the implementation of Add comprehensive unit tests for init_escrow.

The core objective is to: Coverage should ensure zero edge cases for fund lock-up.

By completing this feature, we will ensure that the TrustFlow protocol maintains its high standards for security, usability, and decentralized logic. This issue requires careful attention to the Smart Contracts architecture and adherence to the existing project conventions.

When picking up this issue, please ensure you document any new dependencies or architectural decisions made during development.

Component

Smart Contracts

Difficulty

🟡 Medium

Tasks

• Review Soroban architecture and soroban-cli usage
• Implement Rust logic for: Add comprehensive unit tests for init_escrow
• Write comprehensive unit tests in Rust
• Ensure proper event emission for indexing
• Run cargo fmt and cargo clippy
• Verify soroban contract build successfully compiles to WASM without bloating size

Acceptance Criteria

• Feature accurately implements the objective: Coverage should ensure zero edge cases for fund lock-up.
• Any PR that introduces TypeScript/Rust errors is automatically blocked
• CI pipeline runs in under 3 minutes per PR
• Code is properly reviewed and approved by codeowners

Estimated Time

4-8 hours

[YfengJ]

Hi maintainers, I would like to apply for this issue.

If assigned, I can add focused Rust/Soroban unit tests for init_escrow, covering happy-path setup plus edge cases around fund lock-up, invalid parties/amounts, duplicate initialization, and persisted escrow state invariants using the existing test conventions.

I will wait for assignment or explicit maintainer/GrantFox confirmation before cloning, implementing, or opening a PR.