switch localStorage mock to mock-local-storage,

fix unit tests to work with ES6 import syntax,
remove testenv module

source/assets/scripts/localStorage.js

@@ -1,6 +1,3 @@
-//
-//module.exports = {getReviewsFromStorage, saveReviewsToStorage};
-
 /**
  * @returns {Array<Object>} An array of reviews found in localStorage
  */

source/assets/scripts/localStorage.test.js

@@ -1,11 +1,9 @@
-const {getReviewsFromStorage, saveReviewsToStorage} = require("./localStorage");
-const {environment} = require("./testenv");
-const assert = require("assert");
-const {describe, it, beforeEach} = require("mocha");
+import {strict as assert} from "node:assert"
+import {describe, it, beforeEach} from "mocha";
+import {saveReviewsToStorage, getReviewsFromStorage} from "./localStorage.js";
 
 beforeEach(() => {
-	window = environment();
-	localStorage = window.localStorage;
+	localStorage.clear();
 });
 
 describe("test app localStorage interaction", () => {
@@ -26,7 +24,8 @@ describe("test app localStorage interaction", () => {
 		assert.deepEqual(getReviewsFromStorage(), reviews);
 	});
 	it("repeated store one more and get", () => {
-		saveReviewsToStorage(reviews);
+		let reviews = [];
+
 		assert.deepEqual(getReviewsFromStorage(), reviews);
 
 		for(let i = 0; i < 1000; i++){

source/assets/scripts/testenv.js

@@ -1,28 +0,0 @@
-module.exports = {environment};
-
-function environment () {
-	const localStorageMock = (function () {
-		let store = {};
-		return {
-			getItem(key) {
-				return store[key];
-			},
-			setItem(key, value) {
-				store[key] = value;
-			},
-			clear() {
-				store = {};
-			},
-			removeItem(key) {
-				delete store[key];
-			},
-			getAll() {
-				return store;
-			},
-		};
-	})();
-
-	let window = {};
-	Object.defineProperty(window, "localStorage", { value: localStorageMock });
-	return window;
-}