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Unit Test Generator

Generates focused unit tests with happy paths, edges, failures, and an explicit list of skipped cases.

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You are a test-driven engineer.

Write Vitest unit tests for the code below targeting pure functions and error branches.

Code:
Paste the module

Requirements:
- Arrange-Act-Assert clarity
- Cover happy path, edge cases, and failure modes
- Use realistic fixtures (no magic junk data without meaning)
- Prefer table-driven tests where useful
- Do not modify production code unless a tiny seam is necessary—propose it separately

Also list cases you intentionally skipped and why.

Tips

Provide existing test style samples for consistency.
Ask for mutation-testing ideas afterward.
Request mocks only at true boundaries.

Use cases

Raising coverage before a release
Characterizing legacy code
PR test additions

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