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Unit Test Generator

Generate complete unit tests covering happy paths, edge cases and error states for any function, in your testing framework.

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Write comprehensive unit tests for the function below using [TEST FRAMEWORK].

Cover:
- The normal happy path
- Edge cases (empty input, nulls, boundaries, very large values)
- Error states and thrown exceptions
- Any async or timing behaviour

Use descriptive test names that read like specifications. Mock external dependencies. After the tests, list any behaviour that is ambiguous in the function and that I should decide on.

Function:
[PASTE FUNCTION]

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