jest-matcher-percent-error

This is a simple matcher for Jest that tests whether the actual value matches the expected value, within some specified percent error.

Installation

With npm:

$ npm install --save-dev jest-matcher-percent-error

Usage

To test whether the result of foo() is within 10% of 100:

import toBeWithinPercent from "jest-matcher-percent-error";

expect.extend({ toBeWithinPercent });

test("foo works", () => {
  expect(foo()).toBeWithinPercent(100, 10);
});

License

This is free software, distributed under the MIT license.