Write Unit Tests for a Function

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# Goal
Write unit tests for [function name] in [file path, e.g. src/utils/price.js].

## Context
[Paste the function here]

## Requirements
- Use [test framework, e.g. Vitest].
- Cover the happy path, edge cases (empty, null, very large values) and error cases.
- One describe block per behavior, clear test names.

## Constraints
- Do not modify the function under test.
- No snapshot tests.

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