fix: added npm test action and fixed failing tests (roerohan#14)

* ci(tests): added action to run automated tests

* test(tests): updated tests to succeed upon running npm t

* fix(browserlists): updated browserslist packages

.github/workflows/test.yml

@@ -0,0 +1,23 @@
+name: Run automated tests
+on:
+  pull_request:
+    branches:
+      - main
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          submodules: recursive
+
+      - uses: actions/setup-node@v2
+        with:
+          node-version: 16
+          registry-url: https://registry.npmjs.org/
+
+      - name: npm install, test
+        run: |
+          npm install
+          npm test

src/App.test.tsx

@@ -2,8 +2,14 @@ import React from 'react';
 import { render, screen } from '@testing-library/react';
 import App from './App';
 
-test('renders learn react link', () => {
+test('contains input box for entering VNC URL', () => {
   render(<App />);
-  const linkElement = screen.getByText(/learn react/i);
-  expect(linkElement).toBeInTheDocument();
+  const inputElement = screen.getByPlaceholderText(/wss:\/\/your-vnc-url/i);
+  expect(inputElement).toBeInTheDocument();
+});
+
+test('check if SSL disclaimer is present', () => {
+  render(<App />);
+  const disclaimerElement = screen.getByText(/Since the site is loaded over HTTPS, only `wss:\/\/` URLs \(SSL encrypted websockets URLs\) are supported./i);
+  expect(disclaimerElement).toBeInTheDocument();
 });