🧪 [testing improvement] Add tests for splitWord utility function

[lemononmars]

🎯 What: The testing gap addressed
The splitWord utility function in src/lib/utils/thaiwords.ts was entirely untested. Additionally, the existing src/lib/utils/thaiwords.test.ts file had an unresolved syntax error causing test runner failures.

📊 Coverage: What scenarios are now tested

• Empty strings returning [].
• Simple Thai words without tone marks (e.g. ทำ).
• Complex Thai words with appended vowels and tone marks (e.g. น้ำ, สวัสดี).
• Special characters handled by the function's regex (., *, /).
• Behavior with English text / unsupported characters (characterization test ensuring stability).

✨ Result: The improvement in test coverage
The splitWord function is now fully tested for structural correctness and edge cases. The test suite executes successfully, preventing regressions as the codebase scales.

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PR created automatically by Jules for task 5714233582183761011 started by @lemononmars

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Project	Deployment	Actions	Updated (UTC)
codebreaker	Ready	Preview, Comment	Jul 16, 2026 5:15am

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