Add Jest testing framework

__tests__/integration/page.spec.js

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+const { Builder } = require('selenium-webdriver');
+const chrome = require('selenium-webdriver/chrome');
+const chromeOptions = new chrome.Options();
+
+let driver;
+
+chromeOptions.addArguments('--headless', '--disable-gpu', '--no-sandbox');
+
+beforeEach(async () => {
+  const builder = new Builder().forBrowser('chrome').setChromeOptions(chromeOptions);
+  driver = builder.build();
+});
+
+it('loads the page', async () => {
+  await driver.get('http://localhost:8080');
+  expect(await driver.getTitle()).toEqual('SVG Element Pan & Zoom Demo');
+});
+
+afterEach(async () => {
+  await driver.quit();
+});

__tests__/integration/setup.js

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+const { spawn } = require('child_process');
+
+module.exports = async function (globalConfig, projectConfig) {
+  console.info('\nSpawning server process...');
+  const child = spawn('node', ['server.js']);
+
+  child.stdout.on('data', data => {
+    console.log(`${data}`);
+  });
+
+  globalThis.__INTEG_TEST_SERVER_PID__ = child.pid;
+
+  child.stderr.on('data', data => {
+    const str = data.toString();
+    console.log('[server]', str);
+
+    if (str.includes(projectConfig.globals.testServerUrl)) {
+      setTimeout(resolve, 200);
+    }
+  });
+};

__tests__/integration/teardown.js

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+module.exports = async function (globalConfig, projectConfig) {
+  console.info('Stopping server.');
+  process.kill(globalThis.__INTEG_TEST_SERVER_PID__);
+};