[Test🧪] Add unit tests for QueryAssignmentResponseBody

[mxsm]

Prerequisites

• I have searched existing test issues

Test Scope

Module: rocketmq-remoting
File: src/protocol/body/query_assignment_response_body.rs
Current Coverage: Unknown
Target Coverage: 80%+

Test Cases

The following test scenarios need to be implemented for QueryAssignmentResponseBody:

• Test default initialization creates empty HashSet
• Test Clone trait implementation preserves all fields
• Test serialization to JSON with camelCase field names
• Test deserialization from JSON with camelCase field names
• Test serialization/deserialization roundtrip
• Test with empty message_queue_assignments HashSet
• Test with single MessageQueueAssignment in HashSet
• Test with multiple MessageQueueAssignments in HashSet
• Test HashSet behavior (no duplicates)
• Test adding MessageQueueAssignment to existing struct
• Test MessageQueueAssignment equality in HashSet
• Test Debug trait output
• Test with various MessageQueueAssignment configurations

Willing to contribute?

• I can submit a PR for this