diff --git a/.github/workflows/js-unittest.yml b/.github/workflows/js-unittest.yml
index 5501fef..07438f8 100644
--- a/.github/workflows/js-unittest.yml
+++ b/.github/workflows/js-unittest.yml
@@ -16,7 +16,9 @@ jobs:
       - name: Install apt updates
         run: sudo apt -y update; sudo apt -y upgrade;
       - name: Install prerequisites
-        run: sudo apt install -y nodejs npm;
+        uses: actions/setup-node@v3
+        with:
+          node-version: 18
       - name: Checkout
         uses: actions/checkout@v3
       - name: Install dependencies
diff --git a/package.json b/package.json
index b608888..85da852 100644
--- a/package.json
+++ b/package.json
@@ -1,8 +1,9 @@
 {
   "name": "food-journal",
   "version": "1.0.0",
+  "type": "module",
   "scripts": {
-    "test": "mocha --recursive './{,!(node_modules)/**}/*.test.js'",
+    "test": "mocha --recursive --require mock-local-storage './{,!(node_modules)/**}/*.test.js'",
     "lint": "eslint '**/*.js'",
     "fix-style": "eslint --fix **/*.js",
     "lintHTML": "htmlhint '**/*.html'",
@@ -12,6 +13,7 @@
     "eslint": "^8.27.0",
     "htmlhint": "1.1.4",
     "mocha": "10",
+    "mock-local-storage": "^1.1.23",
     "stylelint": "14.14.1",
     "stylelint-config-standard": "^29.0.0"
   }
diff --git a/static/reset.css b/static/reset.css
index 1517822..bb75762 100644
--- a/static/reset.css
+++ b/static/reset.css
@@ -58,25 +58,25 @@ table {
 }
 
 input, select {
-  vertical-align :middle;
+  vertical-align: middle;
 }
 
 img, fieldset, object {
-  border:none;
+  border: none;
 }
 
 *, *:after, *:before {
-  box-sizing:border-box;
+  box-sizing: border-box;
 }
 
 button, label {
-  cursor:pointer;
+  cursor: pointer;
 }
 
 html, body {
-  height:100%;
+  height: 100%;
 }
 
 form {
-  border
+  border: solid;
 }
\ No newline at end of file
diff --git a/testenv/testenv.js b/testenv/testenv.js
deleted file mode 100644
index e62cfc3..0000000
--- a/testenv/testenv.js
+++ /dev/null
@@ -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;
-}
\ No newline at end of file
diff --git a/testenv/testenv.test.js b/testenv/testenv.test.js
deleted file mode 100644
index efa5739..0000000
--- a/testenv/testenv.test.js
+++ /dev/null
@@ -1,81 +0,0 @@
-const {environment} = require("./testenv.js");
-var assert = require("assert");
-var {describe, it, beforeEach} = require("mocha");
-var {saveToLocal, getFromLocal, removeFromLocal, clearLocal} = require("./testenv_helpers");
-
-beforeEach(() => {
-	window = environment();
-});
-
-describe("test localStorage mock", () => {
-	it("test save and fetch", () => {
-		saveToLocal("testkey1", "testvalue1");
-		saveToLocal("testkey2", "testvalue2");
-		saveToLocal("testkey3", "testvalue3");
-		saveToLocal("testkey4", "testvalue4");
-
-		assert.equal(getFromLocal("testkey1"), "testvalue1");
-		assert.equal(getFromLocal("testkey2"), "testvalue2");
-		assert.equal(getFromLocal("testkey3"), "testvalue3");
-		assert.equal(getFromLocal("testkey4"), "testvalue4");
-
-		saveToLocal("testkey6", "testvalue5");
-		assert.equal(getFromLocal("testkey6"), "testvalue5");
-	});
-
-	it("test window locality", () => {
-		assert.equal(getFromLocal("testkey1"), null);
-		assert.equal(getFromLocal("testkey2"), null);
-		assert.equal(getFromLocal("testkey3"), null);
-		assert.equal(getFromLocal("testkey4"), null);
-	});
-
-	it("test delete and fetch", () => {
-		saveToLocal("testkey1", "testvalue1");
-		saveToLocal("testkey2", "testvalue2");
-		saveToLocal("testkey3", "testvalue3");
-		saveToLocal("testkey4", "testvalue4");
-
-		removeFromLocal("testkey3");
-
-		assert.equal(getFromLocal("testkey1"), "testvalue1");
-		assert.equal(getFromLocal("testkey2"), "testvalue2");
-		assert.equal(getFromLocal("testkey3"), null);
-		assert.equal(getFromLocal("testkey4"), "testvalue4");
-
-		removeFromLocal("testkey1");
-
-		assert.equal(getFromLocal("testkey1"), null);
-		assert.equal(getFromLocal("testkey2"), "testvalue2");
-		assert.equal(getFromLocal("testkey3"), null);
-		assert.equal(getFromLocal("testkey4"), "testvalue4");
-
-		removeFromLocal("testkey4");
-		
-		assert.equal(getFromLocal("testkey1"), null);
-		assert.equal(getFromLocal("testkey2"), "testvalue2");
-		assert.equal(getFromLocal("testkey3"), null);
-		assert.equal(getFromLocal("testkey4"), null);
-
-		removeFromLocal("testkey2");
-		
-		assert.equal(getFromLocal("testkey1"), null);
-		assert.equal(getFromLocal("testkey2"), null);
-		assert.equal(getFromLocal("testkey3"), null);
-		assert.equal(getFromLocal("testkey4"), null);
-	});
-
-	it("test clear and fetch", () => {
-		saveToLocal("testkey1", "testvalue1");
-		saveToLocal("testkey2", "testvalue2");
-		saveToLocal("testkey3", "testvalue3");
-		saveToLocal("testkey4", "testvalue4");
-
-		clearLocal();
-
-		assert.equal(getFromLocal("testkey1"), null);
-		assert.equal(getFromLocal("testkey2"), null);
-		assert.equal(getFromLocal("testkey3"), null);
-		assert.equal(getFromLocal("testkey4"), null);
-	});
-});
\ No newline at end of file
diff --git a/testenv/testenv_helpers.js b/testenv/testenv_helpers.js
deleted file mode 100644
index 7b953de..0000000
--- a/testenv/testenv_helpers.js
+++ /dev/null
@@ -1,17 +0,0 @@
-module.exports = {saveToLocal, getFromLocal, removeFromLocal, clearLocal};
-
-function saveToLocal (k, v) {
-	window.localStorage.setItem(k, v);
-}
-
-function getFromLocal (k) {
-	return window.localStorage.getItem(k);
-}
-
-function removeFromLocal (k) {
-	window.localStorage.removeItem(k);
-}
-
-function clearLocal () {
-	window.localStorage.clear();
-} 
\ No newline at end of file