Expect

The @japa/expect plugin is a wrapper on top of jest-expect. Please reference Jest documentation to view the list of available assertion methods.

Installation

Install the package from the npm packages registry as follows.

npm i -D @japa/expect

And register it as a plugin within the entry point file, i.e. (bin/test.js)

import { expect } from '@japa/expect'
import { configure } from '@japa/runner'

configure({
  files: ['tests/**/*.spec.js'],
  plugins: [expect()]
})

Once done. You can access the expect property from the Test context as follows.

test('add two numbers', ({ expect }) => {
  expect(2 + 2).toEqual(4)
})