test: Add unit test for pkg/math/sum.go

[gru-agent-staging]

Trigger Info

Trigger Type	Triggered By	Source File	Assignment
Manual	zthreefires	pkg/math/sum.go	Detail

Summary

This pull request introduces several key changes and improvements:

1. Feature Enhancements:

   • [Describe any new features or functionality added.]

2. Bug Fixes:

   • [List specific bugs that were addressed and resolved.]

3. Code Refactoring:

   • [Highlight areas of the code that were refactored for better readability, performance, or maintainability.]

4. Documentation Updates:

   • [Mention any updates or additions to documentation.]

5. Testing:

   • [Summarize new tests added or existing tests updated to ensure code reliability.]

6. Other Changes:

   • [Include any miscellaneous updates or changes.]

Please review the changes and provide feedback.

Coverage

The change in coverage value, such as: 0% -> 50%, indicates that the coverage was 0% before writing the tests and 50% after writing them.

https://web.dev/articles/ta-code-coverage

Type	Change
lines	unknown
statements	0% -> 100% 🔺
functions	0% -> 100% 🔺
branches	unknown
source	program

Test Statuses

Status	Change
passed	1 -> 7 🔺
failed	0 -> 0
skipped	0 -> 0
source	program

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