Add upload/download e2e test

playwright.config.ts

@@ -3,8 +3,8 @@ import { defineConfig } from '@playwright/test'
 export default defineConfig({
   testDir: './tests/e2e',
   webServer: {
-    command: 'node .next/standalone/server.js',
+    command: 'PORT=4100 node .next/standalone/server.js',
-    port: 3000,
+    port: 4100,
     timeout: 120 * 1000,
     reuseExistingServer: true,
   },

tests/e2e/basic.test.ts

@@ -2,7 +2,7 @@
 import { test, expect } from '@playwright/test'
 
 test('home page loads', async ({ page }) => {
-  await page.goto('http://localhost:3000/')
+  await page.goto('http://localhost:4100/')
   await expect(
     page.getByText('Peer-to-peer file transfers in your browser.'),
   ).toBeVisible()

tests/e2e/fixtures/testfile.txt

@@ -0,0 +1 @@
+hello from filepizza

tests/e2e/upload-download.test.ts

@@ -0,0 +1,33 @@
+import { test, expect } from '@playwright/test'
+import fs from 'fs'
+import path from 'path'
+import crypto from 'crypto'
+
+const testFilePath = path.join(__dirname, 'fixtures', 'testfile.txt')
+
+function sha256(file: Buffer): string {
+  return crypto.createHash('sha256').update(file).digest('hex')
+}
+
+test('uploader to downloader transfer', async ({ browser }) => {
+  const fileBuffer = fs.readFileSync(testFilePath)
+  const expectedChecksum = sha256(fileBuffer)
+
+  const uploader = await browser.newPage()
+  await uploader.goto('http://localhost:4100/')
+  await uploader.setInputFiles('input[type="file"]', testFilePath)
+  await uploader.getByText('Start').click()
+
+  const shortInput = uploader.getByText('Short URL').locator('..').locator('input')
+  await expect(shortInput).toBeVisible()
+  const shareURL = await shortInput.inputValue()
+
+  const downloader = await browser.newPage()
+  await downloader.goto(shareURL)
+  const downloadPromise = downloader.waitForEvent('download')
+  await downloader.getByText('Download').click()
+  const download = await downloadPromise
+  const downloadedPath = await download.path()
+  const downloadedBuffer = fs.readFileSync(downloadedPath!)
+  expect(sha256(downloadedBuffer)).toBe(expectedChecksum)
+})