Test/bid placement withdrawal#271

[ayomideadeniran]

Summary

This PR adds focused Soroban/Rust smart contract tests for Issue #271 covering bid placement and withdrawal behavior.

Implemented test matrix:

• place_bid
  • valid bid succeeds
  • unverified investor is rejected
  • bid over investor limit is rejected
  • bid on wrong invoice status is rejected
• withdraw_bid
  • bid owner can withdraw
  • non-owner fails authorization
  • accepted bid cannot be withdrawn
  • already withdrawn bid cannot be withdrawn again

Changes

• Added new test module:
  • quicklendx-contracts/src/test/test_bid_placement_withdrawal.rs
• Wired module into test harness:
  • quicklendx-contracts/src/test.rs
• Added execution-output note:
  • quicklendx-contracts/TEST_OUTPUT_ISSUE_271.md

Why

These tests directly validate the required placement/withdrawal authorization and status constraints, reducing regression risk in core bid lifecycle paths.

Commits

• test: add place_bid scenario coverage
• test: add withdraw_bid edge case coverage
• docs: add issue 271 test execution output

Testing

Command attempted:

cargo test -q test_bid_placement_withdrawal --manifest-path quicklendx-contracts/Cargo.toml

In this environment, test execution is blocked by a filesystem error (Invalid cross-device link (os error 18)), captured in quicklendx-contracts/TEST_OUTPUT_ISSUE_271.md.

Please run in CI/local runner to validate full pass and confirm coverage threshold.

Close Pr #271