move localStorage util to localStorage.js,

update main,js to rquire localStroage,
add simple unit tests to localStroage.test.js,
create symlink of testenv.js to source/assets/scripts,
update package.json with proper recursive call

Signed-off-by: Arthur Lu <learthurgo@gmail.com>

source/assets/scripts/localStorage.test.js

@@ -0,0 +1,27 @@
+const {getReviewsFromStorage, saveReviewsToStorage} = require("./localStorage");
+const {environment} = require("./testenv");
+const assert = require("assert");
+const {describe, it, beforeEach} = require("mocha");
+
+beforeEach(() => {
+	window = environment();
+	localStorage = window.localStorage;
+});
+
+describe("test app localStorage interaction", () => {
+	it("get after init", () => {
+		assert.deepEqual(getReviewsFromStorage(), []);
+	});
+	it("store one then get", () => {
+		reviews = [{
+			"imgSrc": "sample src",
+			"imgAlt": "sample alt",
+			"mealName": "sample name",
+			"restaurant": "sample restaurant",
+			"rating": 5
+		}];
+
+		saveReviewsToStorage(reviews);
+		assert.deepEqual(getReviewsFromStorage(), reviews);
+	})
+});