[Test🧪] Add unit tests for Connection

[mxsm]

Prerequisites

• I have searched existing test issues

Test Scope

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

Test Cases

The following test scenarios need to be implemented for Connection:

• Test default initialization creates empty struct
• Test new() constructor creates default values
• Test get_client_id() getter returns cloned value
• Test set_client_id() setter updates value
• Test get_client_addr() getter returns cloned value
• Test set_client_addr() setter updates value
• Test get_language() getter returns language code
• Test set_language() setter updates value
• Test get_version() getter returns version
• Test set_version() setter updates value
• Test Eq trait with identical structs
• Test PartialEq trait with different structs
• Test Hash trait implementation
• Test Clone trait preserves all fields
• Test Debug trait output
• Test serialization to JSON with camelCase
• Test deserialization from JSON with camelCase
• Test serialization/deserialization roundtrip
• Test with various LanguageCode enum values

Willing to contribute?

• I can submit a PR for this