test: add coverage for utility modules

[wilsonwangdev]

Description

Add unit tests for 4 previously untested pure utility modules:

• src/utils/array.mjs — enforceArray() (4 tests)
• src/utils/file.mjs — withExt() (4 tests)
• src/utils/misc.mjs — lazy(), isPlainObject(), deepMerge() (7 tests)
• src/utils/configuration/templates.mjs — populate() (4 tests)

All 19 new tests follow existing conventions (node:assert/strict, describe/it, co-located __tests__/ directories).

Validation

• All 362 tests pass (including 19 new)
• Lint and formatting checks pass

Check List

• I have read the Contributing Guidelines and made commit messages that follow the guideline.
• I have run node --run test and all tests passed.
• I have check code formatting with node --run format & node --run lint.
• I've covered new added functionality with unit tests if necessary.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
api-docs-tooling	Ready	Preview	Mar 29, 2026 9:26am

[avivkeller]

Are you an AI agent? While your implementation is fine, I feel like I'm interacting with a robot.

[wilsonwangdev]

Are you an AI agent? While your implementation is fine, I feel like I'm interacting with a robot.

I use cursor as my editor, it helps me a lot to do such work 😄

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.37%. Comparing base (7e3f5d2) to head (d6cafc6).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #718      +/-   ##
==========================================
+ Coverage   76.15%   76.37%   +0.22%     
==========================================
  Files         151      155       +4     
  Lines       13641    13766     +125     
  Branches     1066     1093      +27     
==========================================
+ Hits        10388    10514     +126     
+ Misses       3248     3247       -1     
  Partials        5        5              

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[avivkeller]

@wilsonwangdev can you rebase?

[wilsonwangdev]

@wilsonwangdev can you rebase?

I have rebased to the latest main. Need I squash the two commits into one too?

[avivkeller]

Nope, the merge will handle that. Thanks for the rebase!