Jest (JavaScript framework)

Jest[1] is a JavaScript testing framework maintained by Facebook, Inc. with a focus on simplicity. It works with projects using: Babel, TypeScript, Node.js, React, Angular, Vue.js and Svelte. It aims to work out of the box and config free.

Usage and examples

 
$ npm install --save-dev jest

For the following module, we will write a corresponding test case:

function sum(a, b) {
  return a + b;
}
module.exports = sum;

If the above file was named sum.js, we will write our test case in a file named sum.test.js for jest to automatically pick it up. The contents of the file will be: 

const sum = require('./sum');

test('adds 1 + 2 to equal 3', () => {
  expect(sum(1, 2)).toBe(3);
});
module.exports = sum;

Then, from the command line, run the command

$ npm run test

This runs the test and outputs the corresponding result in your command line.

gollark: But with the toasters and other random 3D detail, yes.
gollark: Oh, and 3D blinky lights on the "status" page which I really should restore access to.
gollark: It would be the normal 2D website displayed on a virtual rectangle, but occasionally flying toasters would swarm and fly past you.
gollark: I could make osmarks.tk for VR.
gollark: I mean, since not even modern computrons can run high-settings high-FPS high-resolution VR - which is what most people seem fixated on - a phone grade CPU/GPU... will not run it wełł.

See also

References
  1. "Jest Website".
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