Modify jest config and tests to get it to work with ESM

https://jestjs.io/docs/ecmascript-modules

Also remove a test that isn't necessary at the moment.

__tests__/boardmovements-test.js

@@ -1,59 +1,43 @@
+import { jest } from '@jest/globals';
+import { init, selectSpot, flagSpot, getBoardInfo } from '../client/game';
+
 jest.dontMock('../client/game');
 
 describe('select', function () {
     it('will select a spot on the board by marking it as revealed.', function () {
-        var app = require('../client/game');
-
-        app.init({ width: 10, height: 10, mines: 10 });
-        app.selectSpot(2, 2);
-        var boardInfo = app.getBoardInfo();
+        init({ width: 10, height: 10, mines: 10 });
+        selectSpot(2, 2);
+        var boardInfo = getBoardInfo();
 
         expect(boardInfo.revealed[2][2]).toBe(true);
     });
 });
 
 describe('already-select', function () {
     it('will prevent the user from selecting the same spot on the board twice.', function () {
-        var app = require('../client/game');
-
-        app.init({ width: 10, height: 10, mines: 10 });
-        app.selectSpot(2, 2);
+        init({ width: 10, height: 10, mines: 10 });
+        selectSpot(2, 2);
 
-        expect(app.selectSpot(2, 2).hitInfo).toBe('alreadyhit');
+        expect(selectSpot(2, 2).hitInfo).toBe('alreadyhit');
     });
 });
 
-//TODO
-//Export all modules from app.js somehow
-// describe("reveal", function(){
-//   it("will reveal a spot on the board using a direct call to revealSpot.", function(){
-//       var app = require('../client/game');
-//
-//       app.init({width: 10, height: 10, mines: 10});
-//       app.revealSpot
-//   });
-// });
-
 describe('flag', function () {
     it('will flag a spot on the board by marking it as flagged.', function () {
-        var app = require('../client/game');
-
-        app.init({ width: 10, height: 10, mines: 10 });
-        expect(app.flagSpot(2, 2).flagInfo).toBe('flagged');
-        var boardInfo = app.getBoardInfo();
+        init({ width: 10, height: 10, mines: 10 });
+        expect(flagSpot(2, 2).flagInfo).toBe('flagged');
+        var boardInfo = getBoardInfo();
 
         expect(boardInfo.flagged[2][2]).toBe(true);
     });
 });
 
 describe('unflag', function () {
     it('will unflag a spot on the board by calling the flag function twice.', function () {
-        var app = require('../client/game');
-
-        app.init({ width: 10, height: 10, mines: 10 });
-        expect(app.flagSpot(2, 2).flagInfo).toBe('flagged');
-        expect(app.flagSpot(2, 2).flagInfo).toBe('unflagged');
-        var boardInfo = app.getBoardInfo();
+        init({ width: 10, height: 10, mines: 10 });
+        expect(flagSpot(2, 2).flagInfo).toBe('flagged');
+        expect(flagSpot(2, 2).flagInfo).toBe('unflagged');
+        var boardInfo = getBoardInfo();
 
         expect(boardInfo.flagged[2][2]).toBe(false);
     });

__tests__/fullboard-test.js

@@ -1,11 +1,14 @@
+import { jest } from '@jest/globals';
+import { init, getBoardInfo, } from '../client/game';
+import { BoardOverfillException } from '../client/errors';
+
 jest.dontMock('../client/game');
 jest.dontMock('../client/errors');
 
 describe('fullboard', function () {
     it('contains a full board with default values of 10 wide, 10 high, and 10 mines.', function () {
-        var app = require('../client/game');
-        app.init();
-        var boardInfo = app.getBoardInfo();
+        init();
+        var boardInfo = getBoardInfo();
         expect(boardInfo.width).toBe(10);
         expect(boardInfo.height).toBe(10);
         var mineCount = 0;
@@ -22,12 +25,10 @@ describe('fullboard', function () {
 
 describe('overfill', function () {
     it('should be able to throw an error if the board has more mines than it can physically handle.', function () {
-        var app = require('../client/game');
-        var errors = require('../client/errors');
         expect(function () {
-            app.init({ width: 10, height: 10, mines: 101 });
+            init({ width: 10, height: 10, mines: 101 });
         }).toThrow(
-            new errors.BoardOverfillException(
+            new BoardOverfillException(
                 'Amount of mines to generate exceeds amount of board pieces.'
             )
         );

jest.config.js

@@ -1,7 +1,9 @@
 /** @type {import('jest').Config} */
-const config = {
+export default {
     verbose: true,
     reporters: ["default", "jest-junit"],
+    // NOTE: Node needs to be run with --experimental-vm-modules flag
+    // and code transforms need to be disabled in order for Jest to work with ESM.
+    // https://jestjs.io/docs/ecmascript-modules
+    transform: {}
 };
-
-module.exports = config;

package.json

@@ -9,7 +9,7 @@
     "dev": "vite serve",
     "build": "vite build",
     "format": "prettier --config ./.prettierrc --write .",
-    "test": "jest"
+    "test": "node --experimental-vm-modules node_modules/jest-cli/bin/jest.js"
   },
   "repository": {
     "type": "git",