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Write Unit Tests

Generate comprehensive test cases for a function.

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Write unit tests for the following [LANGUAGE] function using [TESTING FRAMEWORK — e.g., Jest, pytest, JUnit]. Include tests for: (1) Normal/expected inputs, (2) Edge cases (empty inputs, large values, null/undefined), (3) Error cases (invalid inputs, boundary conditions). Each test should have a descriptive name that explains what it's testing. Add comments explaining the rationale for non-obvious test cases. ``` [PASTE FUNCTION] ```
testingunit testsquality

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