Summary

This AI unit test generator turns a function name, its parameters, and the edge cases you pick into a ready-to-fill test skeleton for Jest, Vitest, pytest, or PHPUnit. It runs entirely in your browser: no source code leaves your machine, and no server call writes the logic for you. Every assertion carries a clear TODO placeholder for the expected value, so you start from a structured scaffold instead of a blank test file, whether you are testing a JavaScript utility or a WordPress plugin function.

Generate a unit test skeleton for any function

This AI unit test generator drafts Jest, Vitest, pytest, or PHPUnit test skeletons from a function name and its parameters, plus the edge cases you want covered, so you start from a scaffold instead of a blank test file.

Draft a pattern

Build your test skeleton

Type a function name and its parameters, pick a test framework, and check the edge cases you want covered. The skeleton below updates as you type.

Edge cases to cover
Generated test skeleton

This drafts the structure, naming, and edge-case coverage for you. Fill in every /* expected value */ placeholder with what your function should actually return: the widget has no way to know your implementation.

How this works

What the generator actually does

You describe the function

Type the function name and its parameters, comma separated. No source code required: the widget only needs the shape of what you are testing, which is usually faster to type than to explain.

You pick the edge cases

Check the edge cases that matter for this function: zero, a negative number, an empty or null value, an oversized input, or an input that should throw. Skip the ones that do not apply to your logic.

You get a ready-to-fill skeleton

The generator writes the describe and test blocks (or def functions and a TestCase class for pytest and PHPUnit), one assertion per case, with a clear TODO placeholder where your expected value goes.

From a function signature to a filled-in test file

The generator hands you the skeleton: names, structure, and one assertion per edge case. Deciding what a function should actually return still belongs to you and your test runner. Copy the code, replace the /* expected value */ placeholders, and run it the same way you always do.

  • Copy the code with one click
  • Works for JavaScript, Python, and PHP
  • No dependency to install, no build step
Developer reviewing a split-screen code editor showing blurred function and test code on a widescreen monitor

Common questions about this AI unit test generator

Does this actually call an AI model to write the tests?
No. Everything runs in your browser as a rule-based generator: it builds the test structure, naming, and edge-case list from what you type, using the same patterns an experienced test author would reach for. It never sends your function name or parameters to a server, so there is nothing to wait for and nothing to leak.
Which languages and frameworks does it support?
Jest and Vitest for JavaScript, pytest for Python, and PHPUnit for PHP, the framework most WordPress plugin and theme developers already use for their test suite. Each framework gets its own file structure: describe and test blocks for Jest and Vitest, def functions for pytest, and a TestCase class for PHPUnit.
Will the generated test pass immediately?
Not on its own, and it should not. Every assertion ships with a /* expected value */ placeholder because the widget cannot know what your function should return. Replace the placeholder with the value your implementation is supposed to produce, and the test is ready to run against it.
Is this free to use?
Yes. There is no signup, no account, and no limit on how many test skeletons you generate. Bookmark the page and come back whenever you start a new function.
Do I need to paste my real source code?
No. You only need the function name and its parameter names. The generator infers plausible sample arguments from the parameter count and writes one test per edge case you select, without ever seeing your implementation.
Can I use this for a WordPress plugin function?
Yes, pick PHP - PHPUnit. It writes a test class named after your function, matching the way WordPress plugin and theme authors already structure their PHPUnit suites for hooks, filters, and helper functions.
Where do the edge cases in the checklist come from?
They cover the failure modes that come up most often when a function is put in front of real input: zero, a negative number, an empty value, a null or missing argument, an unexpectedly large number, and input that should raise an error. Check the ones that apply to your function; skip the ones that do not.

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