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Unexpected access to unmocked property "Memory._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:66:23)
          at Array.forEach (<anonymous>)

TypeError: globalMock.mockClear is not a function

      at Object.keys.forEach.key (node_modules/jest-runtime/build/index.js:939:24)
          at Array.forEach (<anonymous>)

$ tsc
src/mocking.ts:141:13 - error TS2589: Type instantiation is excessively deep and possibly infinite.

141         id: this.id,
                ~~~~~~~


Found 1 error.

git checkout master
yarn install
yarn add -D [email protected]
yarn build

● 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>)

export default class DungeonMaster {
    sessionNumber: number;

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

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

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);
        });
    });
});