test: add dummy e2e test to demo package (#356)

Co-authored-by: Herve Tribouilloy <herve@digitalrisedorset.co.uk>

Author: digitalrisedorset

_test/demo-package/Test/e2e/.env

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+PLAYWRIGHT_BASE_URL=https://hyva-demo.elgentos.io/

_test/demo-package/Test/e2e/README.md

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+cd e2e
+npm install -D @playwright/test
+npx playwright install
+npm install -D dotenv
+npx playwright test hello-magento.spec.ts

_test/demo-package/Test/e2e/hello-magento.spec.ts

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+import { test, expect } from '@playwright/test';
+
+test.describe('Page health checks', () => {
+    test('Homepage_returns_200', {tag: ['@smoke', '@cold']}, async ({page}) => {
+        const homepageURL = process.env.PLAYWRIGHT_BASE_URL || process.env.BASE_URL;
+        if (!homepageURL) {
+            throw new Error("PLAYWRIGHT_BASE_URL has not been defined in the .env file.");
+        }
+
+        const homepageResponsePromise = page.waitForResponse(homepageURL);
+        await page.goto(homepageURL);
+        const homepageResponse = await homepageResponsePromise;
+        expect(homepageResponse.status(), 'Homepage should return 200').toBe(200);
+
+        const pageTtitle = page.getByRole('heading', {level: 1})
+
+        await expect(pageTtitle, 'Homepage has a visible title').toBeVisible();
+        await expect(pageTtitle).toHaveText(/\S+/);
+    })
+})

_test/demo-package/Test/e2e/playwright.config.ts

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+import { defineConfig } from '@playwright/test';
+import dotenv from 'dotenv';
+
+dotenv.config();
+
+export default defineConfig({
+    testDir: '.',
+});

_test/demo-package/Test/e2e/tsconfig.json

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+{
+  "compilerOptions": {
+    "target": "ES6",
+    "module": "commonjs",
+    "strict": true,
+    "esModuleInterop": true
+  }
+}