The repeat-test library is my attempt to come up with a nicer API for writing property tests in TypeScript.

Warning

While well-tested, this library is new and incomplete. I use it in my own projects, but haven't heard of anyone else using it. For now, this library only works with Deno.

The API should be considered unstable. I like to rename symbols when I think of a better name and might still make major changes before it reaches 1.0 (if it ever does).

So if you use it, I recommend pinning to a specific version. Perhaps using a coding agent will make upgrades easier?

If you're looking for a full-featured, popular, stable property-testing library, I recommend fast-check.

Hello world

The main entry point is the repeatTest function. Here's how to use it as a glorified while loop:

import { assertEquals } from "@std/assert";
import { repeatTest } from "@skybrian/repeat-test";

const examples = ["hello", "world"];

repeatTest(examples, (word) => {
  assertEquals(word.length, 5); // This will run twice.
});

The first argument to repeatTest provides a way of generating examples. The second argument is a test function to run repeatedly that takes an example as input. A repetition ("rep" for short) passes if the test function completes normally.

Documentation

See the docs directory for a longer introduction.