Add Unit Tests for DealInfo and DealClient Contracts

[tesol2y090]

Background

The DealInfo and DealClient contracts currently lack comprehensive unit tests, making it difficult to ensure their reliability and proper functioning. We need to implement test coverage for all major functionalities of these contracts.

Requirements

• Create mock implementations for MarketAPI dependencies
• Implement unit tests for all public functions in DealInfo contract
• Implement unit tests for all public functions in DealClient contract
• Ensure proper testing of deal proposal creation and management
• Test owner-restricted functions
• Test error cases and access controls

Technical Details

• Need to mock the Filecoin MarketAPI calls
• Need to handle BigInt and ChainEpoch type conversions
• Need to simulate deal lifecycle operations
• Need to verify events and state changes