[expo-localization] Incompatibility with Jest 26+

[msynowski]

🐛 Bug Report

Summary of Issue

Running unit tests of components, that use expo-localization ends with error caused by removing require.requireActual
in Jest 26+ (jestjs/jest/pull/9854

Steps to Reproduce

Write unit tests with Jest for components, that use expo-localization and simply run them.

Expected Behavior vs Actual Behavior

Expected: working tests

Actual behavior:

  ● Test suite failed to run

    TypeError: require.requireActual is not a function

    > 1 | import * as Localization from "expo-localization";
        | ^

[byCedric]

Hi @Shizerq, thanks for your issue report. We have patched the usage of require.requireActual in this PR, and should be included in SDK 38. I'm not sure what you are currently using, but upgrading to 38 should fix this for you.

I'm not sure why you get this error in expo-localization. The tests in that one shouldn't run in your project. We did have some traces of require.requireActual in jest-expo, I think that's the origin of your error (but correct me if I'm wrong).

Hope this helps!

[leonaburime]

Hi @byCedric, I have the exact same problem and am using "expo": "^38.0.0". Im trying to run jest tests and installed everything on this page

What else can I do?