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Unit Test Generator

Write comprehensive unit tests for the following [LANGUAGE] code:

[PASTE CODE HERE]
Requirements:
- Use [TESTING FRAMEWORK] (e.g., Jest, pytest, JUnit)
- Cover all public methods/functions
- Include tests for: happy path, edge cases, error handling, boundary values
- Mock external dependencies
- Aim for >90% code coverage
- Use descriptive test names following "should [expected behavior] when [condition]" pattern
- Group tests logically with describe/context blocks
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