[ISSUE #5378]🧪Add test case for ToolsError

[WaterWhisperer]

Which Issue(s) This PR Fixes(Closes)

Fixes #5378

Brief Description

How Did You Test This Change?

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📥 Commits

Reviewing files that changed from the base of the PR and between b12f7a6 and 7b76678.

📒 Files selected for processing (1)

• rocketmq-error/src/unified/tools.rs

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[rocketmq-rust-bot]

🔊@WaterWhisperer 🚀Thanks for your contribution🎉！

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 37.89%. Comparing base (b12f7a6) to head (7b76678).
⚠️ Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5448      +/-   ##
==========================================
+ Coverage   37.83%   37.89%   +0.06%     
==========================================
  Files         811      811              
  Lines      109905   109976      +71     
==========================================
+ Hits        41582    41675      +93     
+ Misses      68323    68301      -22     

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[rocketmq-rust-bot]

LGTM - All CI checks passed ✅