Add test case for file uploads (#49048)

This PR adds a test case of handling file inputs in a form.

Fixes NEXT-1062

test/e2e/app-dir/actions/app-action.test.ts

@@ -85,6 +85,34 @@ createNextDescribe(
       }, 'my-not-found')
     })
 
+    it('should support uploading files', async () => {
+      const logs: string[] = []
+      next.on('stdout', (log) => {
+        logs.push(log)
+      })
+      next.on('stderr', (log) => {
+        logs.push(log)
+      })
+
+      const browser = await next.browser('/server')
+
+      // Fake a file to upload
+      await browser.eval(`
+        const file = new File(['hello'], 'hello.txt', { type: 'text/plain' });
+        const list = new DataTransfer();
+        list.items.add(file);
+        document.getElementById('file').files = list.files;
+      `)
+
+      await browser.elementByCss('#upload').click()
+
+      await check(() => {
+        return logs.some((log) => log.includes('File name: hello.txt size: 5'))
+          ? 'yes'
+          : ''
+      }, 'yes')
+    })
+
     it('should support hoc auth wrappers', async () => {
       const browser = await next.browser('/header')
       await await browser.eval(`document.cookie = 'auth=0'`)

test/e2e/app-dir/actions/app/server/form.js

@@ -15,6 +15,12 @@ async function nowhere() {
   notFound()
 }
 
+async function file(formData) {
+  'use server'
+  const file = formData.get('file')
+  console.log('File name:', file.name, 'size:', file.size)
+}
+
 export default function Form() {
   return (
     <>
@@ -33,6 +39,13 @@ export default function Form() {
           Go nowhere
         </button>
       </form>
+      <hr />
+      <form action={file}>
+        <input type="file" name="file" id="file" required />
+        <button type="submit" id="upload">
+          Upload file
+        </button>
+      </form>
     </>
   )
 }