@nerdo/jest-extended

nerdo's custom jest matchers

Install it

npm install --save-dev @nerdo/jest-extended

Set it up

// jest.config.js
module.exports = {
  setupFilesAfterEnv: [
    '@nerdo/jest-extended'
  ]
}

If you are using TypeScript and your editor does not recognize the new matchers, create a global.d.ts file in your project.

// global.d.ts
import '@nerdo/jest-extended'

If it still is not working, you may also need to create a tsconfig.json with an empty object {} defined as the contents.

Asymmetric Matchers

expect.arrayExclusivelyContaining(array)

expect.arrayExclusivelyContaining(array) matches a received array which contains all of the elements in the expected array AND contains the same number of elements.

It usage is exactly the same as jest's built-in expect.arrayContaining(array).

expect.objectExclusivelyContaining(object)

expect.objectExclusivelyContaining(object) matches a received object which contains all of the keys and values in the expected object AND contains the same number of properties.

It usage is exactly the same as jest's built-in expect.objectContaining(object)