Mocking imported modules having problems with babel 7

[imjeremyhi]

🐛 Bug Report

The below code does not work, with the error.
Cannot set property bar of [object Object] which has only a getter
import * as foo from './foo'; foo.bar = jest.fn();

Edit: After further investigation I've isolated it to the use case - Importing and then re-exporting objects/modules within a single object causes these objects/modules to become immutable which means I cannot stub them. Is this a known issue/is there a known work around?

To Reproduce

My source code looks something like this: https://repl.it/repls/SunnyRuddyTheory, but instead of the require I do: import * as abc from './add. This test passes since its using the babel 6 transpiled version, but with babel 7, it does not work.

Environment:

It works when used with babel 6, but does not work with babel 7.
It looks like babel has made this import * syntax such that the variable cannot be overridden. I have tested overriding the module works with default imports, but does not work with { Foo } object destructured imports nor import * imports.

Expected behavior

This should work with babel 7? Documented approaches such as:
const spy = jest.spyOn(video, 'play'); would no longer work if this isn't resolved.

Run npx envinfo --preset jest

Paste the results here:

  System:
    OS: macOS Sierra 10.12.6
    CPU: x64 Intel(R) Core(TM) i7-4870HQ CPU @ 2.50GHz
  Binaries:
    Node: 10.9.0 - ~/.nvm/versions/node/v10.9.0/bin/node
    Yarn: 1.9.2 - /usr/local/bin/yarn
    npm: 6.2.0 - ~/.nvm/versions/node/v10.9.0/bin/npm
  npmPackages:
    jest: ^23.4.2 => 23.4.2

[thymikee]

We've upgraded Jest to use Babel 7, so this shouldn't be an issue anymore. Please test with jest@beta and let us know :)

[github-actions]

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