Write Unit Tests — Cover Edge Cases

Generates unit tests in {{framework}} that cover the happy path, edge cases, and error conditions. Tests are runnable, not pseudocode.

The prompt

Write unit tests for this function using {{test_framework}} (e.g., Jest, Vitest, pytest).

Cover these cases explicitly:

1. Happy path: typical valid input, expected output.
2. Edge cases: empty input, single element, very large input, boundary values.
3. Error cases: invalid input, null/undefined, wrong types — what the function should do (throw, return null, etc.).
4. Off-by-one risks: anything involving array indices, ranges, dates.

Each test must be runnable as-is. No "// TODO" placeholders. No mocking the function under test. Mock only external dependencies (network, time, randomness).

Code to test:
{{code}}

Recommended models

• Claude Sonnet 4.6
• GPT-5
• GPT-4.1

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