Which frameworks are supported?

Jest, Vitest, Mocha+Chai (JS/TS), Pytest, unittest (Python), JUnit 5 (Java), RSpec (Ruby), Go testing (Go), XCTest (Swift). Pick from the dropdown before generating.

Does it generate mocks?

Only when the function has external dependencies (network calls, file I/O, database). For pure functions you get deterministic assertions, not mocks — which is the correct choice for testability.

How are edge cases chosen?

The prompt forces coverage of null/undefined, empty collections, zero/negative numbers, boundary values (min/max for the types present), and error paths (thrown exceptions, bad input).

What's the input limit?

5,000 characters. For very large functions, extract the core logic or split into smaller units before generating tests — large functions are usually a smell anyway.

Unit Test Generator

Paste any function (JavaScript, TypeScript, Python, Java, Go, Ruby, Swift) and select your test framework. Returns a complete, runnable test file with happy-path tests, edge-case tests (null, empty, zero, boundary), and error-path tests (thrown exceptions, bad input). Uses the correct imports and syntax per framework. Powered by Amazon Nova Micro on AWS Bedrock. Daily-capped to stay free.

Paste a function, pick your framework, get a complete test file covering happy path, edges, and errors.

Framework:

Paste your function0 / 5,000

What you get

• Happy-path tests
• Edge cases (null, empty, zero, boundaries)
• Error path tests (thrown exceptions, bad input)
• Correct imports + syntax per framework
• Clear test names describing intent
• Deterministic assertions (not snapshots)

Next useful step

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Frequently Asked Questions

Which frameworks are supported?: Jest, Vitest, Mocha+Chai (JS/TS), Pytest, unittest (Python), JUnit 5 (Java), RSpec (Ruby), Go testing (Go), XCTest (Swift). Pick from the dropdown before generating.
Does it generate mocks?: Only when the function has external dependencies (network calls, file I/O, database). For pure functions you get deterministic assertions, not mocks — which is the correct choice for testability.
How are edge cases chosen?: The prompt forces coverage of null/undefined, empty collections, zero/negative numbers, boundary values (min/max for the types present), and error paths (thrown exceptions, bad input).
What's the input limit?: 5,000 characters. For very large functions, extract the core logic or split into smaller units before generating tests — large functions are usually a smell anyway.

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About Unit Test Generator

Paste a function, pick a framework, get a runnable test file covering happy path, edges, and error cases. Jest/Vitest/Pytest/JUnit/Go/RSpec. Free, no login. This AI-backed tool sends your input to MarkdownMe's capped Amazon Bedrock endpoint to generate the result. No account is required. MarkdownMe provides free, fast, and reliable Markdown tools for developers, writers, and anyone who works with Markdown.