Replace Saucelabs with Playwright

Also reorganized npm scripts.

tests/browser/.eslintrc.js

@@ -0,0 +1,5 @@
+module.exports = {
+  parserOptions: {
+    ecmaVersion: 2020
+  }
+};

tests/browser/README.md

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+# Browser Tests with Playwright
+
+These tests execute Mocha tests from the `spec`-folder in multiple browsers.
+
+## Using Docker
+
+Execute the following commands in the project root:
+
+```bash
+npm install
+npx grunt prepare
+docker pull mcr.microsoft.com/playwright:focal
+docker run -it --rm --volume $(pwd):/srv/app --workdir /srv/app --ipc=host mcr.microsoft.com/playwright:focal npm run test:browser
+```

tests/browser/playwright.config.js

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+const { devices } = require('@playwright/test');
+
+/** @type {import('@playwright/test').PlaywrightTestConfig} */
+const config = {
+  projects: [
+    {
+      name: 'chromium',
+      use: { ...devices['Desktop Chrome'] }
+    },
+    {
+      name: 'firefox',
+      use: { ...devices['Desktop Firefox'] }
+    },
+    {
+      name: 'webkit',
+      use: { ...devices['Desktop Safari'] }
+    }
+  ],
+  reporter: 'list',
+  webServer: {
+    command: 'npm run test:serve',
+    port: 3000,
+    reuseExistingServer: false
+  }
+};
+
+module.exports = config;

tests/browser/spec.js

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+const { test, expect } = require('@playwright/test');
+
+async function waitForMochaAndAssertResult(page) {
+  await page.waitForFunction(() => window.mochaResults); // eslint-disable-line no-undef
+  const mochaResults = await page.evaluate('window.mochaResults');
+
+  expect(mochaResults.failures).toBe(0);
+}
+
+test('Spec handlebars.js', async ({ page, baseURL }) => {
+  await page.goto(`${baseURL}/spec/?headless=true`);
+  await waitForMochaAndAssertResult(page);
+});
+
+test('Spec handlebars.amd.js (AMD)', async ({ page, baseURL }) => {
+  await page.goto(`${baseURL}/spec/amd.html?headless=true`);
+  await waitForMochaAndAssertResult(page);
+});
+
+test('Spec handlebars.runtime.amd.js (AMD)', async ({ page, baseURL }) => {
+  await page.goto(`${baseURL}/spec/amd-runtime.html?headless=true`);
+  await waitForMochaAndAssertResult(page);
+});
+
+test('Spec handlebars.js (UMD)', async ({ page, baseURL }) => {
+  await page.goto(`${baseURL}/spec/umd.html?headless=true`);
+  await waitForMochaAndAssertResult(page);
+});
+
+test('Spec handlebars.runtime.js (UMD)', async ({ page, baseURL }) => {
+  await page.goto(`${baseURL}/spec/umd-runtime.html?headless=true`);
+  await waitForMochaAndAssertResult(page);
+});