How to test a React Native component that imports a custom native module with Jest?

Question

Here is a simple component that I am trying to test using React Native 0.39 and Jest 18:

// index.ios.js

import React, { Component } from \'react\';
import { Ap         


        

Answer 1

Jest is a JavaScript testing tool, it won't run code that you have written in Objective C/Swift/Java in a native module. You can mock the functionality of a native module so that you can call it from JavaScript by the approach you linked to. eg.

jest.mock('NetInfo', () => {
  return {
    isConnected: {
      fetch: () => {
        return new Promise((accept, resolve) => {
          accept(true);
        })
      }
    }
  }
});