jest.mock does not mock async methods in module

[troyschneringer]

node: 7.6.0
os: macOS Sierra (10.12.3)

I have create a module with a method defined as async. When mocking that module in tests it does not mock the async method.

module.js

function awaitable() {
  return Promise.resolve();
}

module.exports.asyncMethod = async () => {
  await awaitable();
  return 42;
}
module.exports.syncMethod = () => {
  return 42;
}

example.test.js

jest.mock('./module');
const mod = require('./module');

describe('async module method', () =>{
  test('does not get mocked', () => {
    expect(mod.asyncMethod).toBeDefined();
    expect(mod.syncMethod).toBeDefined();
  });
});

package.json

{
  "name": "test",
  "version": "1.0.0",
  "main": "index.js",
  "scripts": {
    "test": "jest"
  },
  "author": "",
  "license": "ISC",
  "description": "",
  "dependencies": {
    "jest": "^19.0.2"
  }
}

The test fails because the asyncMethod is not defined on the mocked module.

[troyschneringer]

I have worked around this by adding the following to my tests (but its obviously less that ideal):

beforeAll(() => {
  mod.asyncMethod = jest.fn();
});

[gregberge]

+1, same problem

[thymikee]

Cannot repro, both tests pass in my case (I use transform-async-to-generator).

[gregberge]

It only happens if you use the native implementation of async / await.

[github-actions]

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