test: add Playwright mobile and desktop scenario coverage

apps/web/e2e/viewport.spec.ts

@@ -0,0 +1,81 @@
+/**
+ * Mobile and desktop viewport scenario coverage — issue #591.
+ *
+ * Verifies that key user flows work and render correctly on both mobile and
+ * desktop viewports. The Playwright project matrix (playwright.config.ts)
+ * runs these tests on real mobile device emulations (Pixel 5, iPhone 13) as
+ * well as Desktop Chrome/Firefox/Safari, so individual tests here do not need
+ * to set a viewport manually.
+ */
+
+import { expect, test } from '@playwright/test'
+
+const validResponse = {
+  certificate: {
+    id: 'cert-viewport-test',
+    kwh: 10,
+    issued_at: '2025-06-01T00:00:00.000Z',
+    retired: false,
+    retired_at: null,
+    retired_by: null,
+  },
+  on_chain: {
+    anchor_tx: 'anchor_tx_viewport',
+    anchor_explorer: 'https://stellar.explorer/tx/anchor_tx_viewport',
+    mint_tx: 'mint_tx_viewport',
+    mint_explorer: 'https://stellar.explorer/tx/mint_tx_viewport',
+  },
+  meter_proof: {
+    meter_id: 'meter-viewport',
+    reading_hash: '1234abcd',
+    signature_hex: 'beefbeefbeefbeef',
+    kwh: 10,
+    timestamp: '2025-06-01T00:00:00.000Z',
+    verified: true,
+  },
+}
+
+test.beforeEach(async ({ page }) => {
+  await page.route('**/api/verify**', async (route) => {
+    await route.fulfill({
+      status: 200,
+      contentType: 'application/json',
+      body: JSON.stringify(validResponse),
+    })
+  })
+})
+
+test('home page renders primary CTA on any viewport', async ({ page }) => {
+  await page.goto('/')
+  // The primary call-to-action must be visible without horizontal scroll
+  const body = page.locator('body')
+  await expect(body).toBeVisible()
+  const scrollWidth: number = await page.evaluate(() => document.body.scrollWidth)
+  const clientWidth: number = await page.evaluate(() => document.body.clientWidth)
+  expect(scrollWidth).toBeLessThanOrEqual(clientWidth + 1) // no horizontal overflow
+})
+
+test('verify page is usable and shows result on any viewport', async ({ page }) => {
+  await page.goto('/verify')
+  // Form and submit button must be reachable without horizontal scroll
+  const verifyButton = page.locator('button:has-text("Verify")')
+  await expect(verifyButton).toBeVisible()
+  await Promise.all([
+    page.waitForResponse('**/api/verify**'),
+    verifyButton.click(),
+  ])
+  await expect(page.locator('text=Certificate verified successfully.')).toBeVisible()
+})
+
+test('navigation is accessible on any viewport', async ({ page }) => {
+  await page.goto('/')
+  // On mobile, a hamburger / menu toggle may be present instead of a full nav.
+  // Either the nav links are visible or a menu toggle exists.
+  const hasVisibleNav = await page.locator('nav a').first().isVisible().catch(() => false)
+  const hasMenuToggle = await page
+    .locator('[aria-label*="menu" i], [aria-label*="navigation" i], button[aria-expanded]')
+    .first()
+    .isVisible()
+    .catch(() => false)
+  expect(hasVisibleNav || hasMenuToggle).toBe(true)
+})

apps/web/playwright.config.ts

@@ -18,10 +18,28 @@ export default defineConfig({
     actionTimeout: 10000,
   },
   projects: [
+    // Desktop browsers
     {
       name: 'chromium',
       use: { ...devices['Desktop Chrome'] },
     },
+    {
+      name: 'firefox',
+      use: { ...devices['Desktop Firefox'] },
+    },
+    {
+      name: 'webkit',
+      use: { ...devices['Desktop Safari'] },
+    },
+    // Mobile browsers
+    {
+      name: 'mobile-chrome',
+      use: { ...devices['Pixel 5'] },
+    },
+    {
+      name: 'mobile-safari',
+      use: { ...devices['iPhone 13'] },
+    },
   ],
   webServer: {
     command: 'pnpm exec next dev --hostname 127.0.0.1 --port 3000',