Unexpected access to unmocked property "Game._isMockFunction".

[aksu560]

When mocking the Game global, Jest errors out with:

● Test suite failed to run

    Unexpected access to unmocked property "Game._isMockFunction".
    Did you forget to mock it?
    If you intended for it to be undefined, you can explicitly set it to undefined (recommended) or set "allowUndefinedAccess" argument to true.

      at Object.get (node_modules/screeps-jest/src/mocking.js:64:23)
          at Array.forEach (<anonymous>)

jest version: 26.6.3 ts-jest version: 26.5.6

Reproduction: src/DungeonMaster/index.ts

export default class DungeonMaster {
    sessionNumber: number;

    constructor() {
        this.sessionNumber = Game.time;
    };

    public run_session(): void {
        console.log("DungeonMaster: Session " + this.sessionNumber + " started.");
    }
}

src/DungeonMaster/index.spec.ts

import { mockGlobal } from 'screeps-jest';
import DungeonMaster from 'DungeonMaster';
import { expect } from '@jest/globals';

describe('DungeonMaster', () => {
    describe('#constructor', () => {
        it('should create a new DungeonMaster instance', () => {
            mockGlobal<Game>('Game', {
                time: 123
            });
            const instance = new DungeonMaster();
            expect(instance).toBeInstanceOf(DungeonMaster);
        });
    });
});

run npm test

[aksu560]

Issue was old version of screeps-jest. I blindly followed the readme, and hence got version 1.0.0. Upgrading to 1.3.1 fixes the issue.

[eduter]

Right, I see now that PR #6 fixed that for version 1.2.0