React Native Jest

jest.setup.js

// Setup for use with enzyme
// Patching console.error so test will fail

const Enzyme = require('enzyme');
const Adapter = require('enzyme-adapter-react-16');

Enzyme.configure({ adapter: new Adapter() }); 

//fix redux saga test plan which needs setTimeout on window
global.window.setTimeout = global.setTimeout;


// Ignore console.log whilst running tests
console.log = () => {};

// Throw error upon console.error to fail test
// Ignore a few console.error whilst running tests
const suppressedErrors = /(React\.createElement: type is invalid)/;
const realConsoleError = console.error;
console.error = message => {
  if (message.match(suppressedErrors)) {
    return;
  }
  const msg = `Console.Error in Test: "${message}"`
  debugger;
  realConsoleError(msg);
  throw new Error(msg);
};

// Fix "BlobModule.addNetworkingHandler is not a function" when upgrading to react native 0.54
import { NativeModules } from "react-native";
NativeModules.BlobModule = {
  ...NativeModules.BlobModule,
  addNetworkingHandler: jest.fn()
};