[Java SDK] Add Error Handling and Edge Case Tests for Async Client

[chiradip]

Title

Improve error handling test coverage for async TCP client

Description

The async client needs comprehensive error handling tests to ensure robust behavior under failure conditions. Currently, only NULL consumer timeout is tested.

Tasks

• Add connection failure tests:
  • Server unreachable
  • Invalid host/port
  • Connection timeout scenarios
• Add network interruption tests:
  • Connection drops during operation
  • Partial message transmission
  • Reconnection logic
• Add protocol error tests:
  • Invalid command codes
  • Malformed messages
  • Server error responses
• Add resource cleanup tests:
  • Proper channel closure
  • Memory leak prevention
  • Thread pool shutdown

Labels

enhancement, testing, reliability, async-client, java-sdk