[ISSUE #5377]🧪Add test case for SerializationError

[WaterWhisperer]

Which Issue(s) This PR Fixes(Closes)

Fixes #5377

Brief Description

How Did You Test This Change?

Summary by CodeRabbit

Release Notes

• Tests

  • Expanded error handling test coverage for serialization and deserialization scenarios, including format validation and character encoding.

• Bug Fixes

  • Improved consistency and precision in error messages and error type handling during serialization operations.

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[rocketmq-rust-bot]

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Walkthrough

This pull request expands test coverage for the SerializationError type by adding test cases for additional error variants, constructors, and trait implementations, while refining existing tests to use exact string equality assertions.

Changes

Cohort / File(s)

Summary

SerializationError Test Expansion rocketmq-error/src/unified/serialization.rs

Added comprehensive test cases for error variants (InvalidFormat, InvalidValue, ProtobufError, EventSerializationFailed, EventDeserializationFailed, InvalidEventType, UnknownEventType); introduced tests for new error constructors (invalid_format, missing_field, event_serialization_failed, event_deserialization_failed, invalid_event_type, unknown_event_type); added tests for From trait implementations (Utf8Error, serde_json::Error); tightened existing test assertions to verify exact string output formats

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Poem

🐰 Hop, hop, through the tests we go!
Error cases, watch them flow,
Coverage growing, assertions tight,
Our SerializationErrors shining bright! ✨

Pre-merge checks and finishing touches

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The PR title accurately reflects the main change: adding test cases for SerializationError. It is concise, specific, and clearly summarizes the primary objective.
Linked Issues check	✅ Passed	The PR successfully implements the requirement from issue #5377 by adding comprehensive test cases for SerializationError, including multiple error variants and conversion implementations.
Out of Scope Changes check	✅ Passed	All changes are directly related to the linked issue #5377, focusing solely on expanding test coverage for SerializationError with no extraneous modifications.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

✨ Finishing touches

• 📝 Generate docstrings

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[coderabbitai]

Actionable comments posted: 0

🧹 Nitpick comments (1)

rocketmq-error/src/unified/serialization.rs (1)

178-188: Good coverage for UTF-8 error conversion.

The test validates the From<std::str::Utf8Error> implementation correctly. The exact string assertion on the standard library's error message is acceptable, though if it becomes brittle across Rust versions, consider using a more flexible check.

💡 Optional: More flexible assertion if this becomes brittle

-        assert_eq!(
-            err.to_string(),
-            "UTF-8 encoding error: invalid utf-8 sequence of 1 bytes from index 1"
-        );
+        let msg = err.to_string();
+        assert!(msg.starts_with("UTF-8 encoding error:"));
+        assert!(msg.contains("invalid utf-8 sequence"));

📜 Review details

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between b12f7a6 and 8a2128c.

📒 Files selected for processing (1)

• rocketmq-error/src/unified/serialization.rs

🧰 Additional context used

🧬 Code graph analysis (1)

rocketmq-error/src/unified/serialization.rs (1)

rocketmq-error/src/lib.rs (1)

• from (483-595)

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• GitHub Check: auto-approve

🔇 Additional comments (3)

rocketmq-error/src/unified/serialization.rs (3)

145-148: LGTM! Improved test precision.

The exact string equality assertions ensure the error message format is validated precisely, which is better than pattern matching or contains checks.

---

150-176: Excellent test coverage for all error variants!

The tests comprehensively cover all SerializationError variants and their constructors. The approach is consistent:

• Uses helper constructors (invalid_format, event_serialization_failed, etc.) where available
• Uses direct variant construction for InvalidValue and ProtobufError which don't have dedicated constructors

All assertions verify the exact error message format, ensuring the Display implementations work correctly.

---

190-197: LGTM! Proper testing of JSON error conversion.

The test correctly validates the From<serde_json::Error> implementation with appropriate feature gating. Using contains() for assertion is the right choice here, as serde_json error messages can vary depending on the error type.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 37.85%. Comparing base (b12f7a6) to head (8a2128c).
⚠️ Report is 10 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5447      +/-   ##
==========================================
+ Coverage   37.83%   37.85%   +0.02%     
==========================================
  Files         811      811              
  Lines      109905   109935      +30     
==========================================
+ Hits        41582    41621      +39     
+ Misses      68323    68314       -9     

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[rocketmq-rust-bot]

LGTM - All CI checks passed ✅