Unit Test Generator

Prompt

Write comprehensive unit tests for the following [language] function/class:

```[language]
[paste your code here]
```

Testing framework: [Jest/pytest/JUnit/etc.]. Write tests covering: happy path scenarios, edge cases, boundary values, error/exception handling, null/undefined inputs, and async behavior (if applicable). Use: AAA pattern (Arrange/Act/Assert), descriptive test names, appropriate mocking/stubbing, and test data factories. Aim for 90%+ coverage. Include a brief description of what each test group verifies.