Add Tests for ACL Contract Module

[Mosas2000]

Description

The ACL contract module has no tests. contracts/soroban/src/acl.rs is implemented but has no corresponding test file in contracts/soroban/tests/ (only asset_locking, source_trust, and relay tests exist). Access-control grant/revoke/check logic is untested.

Requirements and context

• Add an acl.test.rs covering ACL flows
• Cover grant, revoke, check, and unauthorized access
• Run under cargo test
• Follow the existing contract test conventions

Suggested execution

Fork the repo and create a branch

git checkout -b test/contract-acl

Implement changes

• Add the ACL test module
• Cover happy paths and rejection cases
• Verify with cargo test

Example commit message

test: add tests for ACL contract module

Guidelines

• Assignment required before starting
• PR must include a closing reference to this issue
• Timeframe: 72 hours