Can't run tests with React Native 0.56

[victorlevasseur]

Environment

React Native Environment Info:
System:
OS: Linux 4.15 Ubuntu 18.04 LTS (Bionic Beaver)
CPU: x64 Intel(R) Core(TM) i7-8550U CPU @ 1.80GHz
Memory: 3.08 GB / 15.39 GB
Shell: 4.4.19 - /bin/bash
Binaries:
Node: 8.10.0 - /usr/bin/node
Yarn: 1.5.1 - /usr/local/bin/yarn
npm: 6.1.0 - /usr/local/bin/npm
npmPackages:
react: 16.4.1 => 16.4.1
react-native: 0.56.0 => 0.56.0
npmGlobalPackages:
react-native-cli: 2.0.1

Description

When launching the tests with npm test, I get the following output :

JsProject@0.0.1 test /home/victor/Wedoogift/JsProject
> jest

 FAIL  ./App.test.js
  ● Test suite failed to run

    SyntaxError: /home/victor/Wedoogift/JsProject/node_modules/react-native/Libraries/Utilities/Platform.ios.js: Unexpected token, expected "{" (35:17)

      33 |     return constants ? constants.interfaceIdiom === 'tv' : false;
      34 |   },
    > 35 |   get isTesting(): boolean {
         |                  ^
      36 |     const constants = NativeModules.PlatformConstants;
      37 |     return constants && constants.isTesting;
      38 |   },

      at Parser.raise (node_modules/@babel/core/node_modules/babylon/lib/index.js:776:15)
      at Parser.unexpected (node_modules/@babel/core/node_modules/babylon/lib/index.js:2079:16)
      at Parser.expect (node_modules/@babel/core/node_modules/babylon/lib/index.js:2067:28)
      at Parser.parseBlock (node_modules/@babel/core/node_modules/babylon/lib/index.js:4488:10)
      at Parser.parseFunctionBody (node_modules/@babel/core/node_modules/babylon/lib/index.js:3754:24)
      at Parser.parseFunctionBodyAndFinish (node_modules/@babel/core/node_modules/babylon/lib/index.js:3734:10)
      at Parser.parseMethod (node_modules/@babel/core/node_modules/babylon/lib/index.js:3686:10)
      at Parser.parseObjectMethod (node_modules/@babel/core/node_modules/babylon/lib/index.js:3609:12)
      at Parser.parseObjPropValue (node_modules/@babel/core/node_modules/babylon/lib/index.js:3644:21)
      at Parser.parseObj (node_modules/@babel/core/node_modules/babylon/lib/index.js:3555:12)

Test Suites: 1 failed, 1 total
Tests:       0 total

Reproducible Demo

It just consists of the default app obtained with "react-native init" and with an "App.test.js" file containing the following code :

import * as React from 'react';

import renderer from 'react-test-renderer';
import App from "./App";

test('renders correctly', () => {
  const tree = renderer.create(<App />).toJSON();
  expect(tree).toMatchSnapshot();
});

Note: I had to add babel-core^7.0.0-beta3 to be able to start the tests.

[kelset]

Duplicate of #19859