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An Async Example

An Async Example

First, enable Babel support in Jest as documented in the Getting Started guide.

Let's implement a simple module that fetches user data from an API and returns the user name.

// user.js
import request from './request';

export function getUserName(userID) {
  return request('/users/' + userID).then(user => user.name);
}

In the above implementation we expect the request.js module to return a promise. We chain a call to then to receive the user name.

Now imagine an implementation of request.js that goes to the network and fetches some user data:

// request.js
const http = require('http');

export default funct