Add test for async iterator in endpoint body

Author: jesseskinner

packages/kit/test/apps/basics/src/routes/endpoint-output/_tests.js

@@ -56,4 +56,10 @@ export default function (test) {
 		assert.equal(res.headers.get('content-type'), 'application/xml');
 		assert.equal(await res.text(), '<foo />');
 	});
+
+	test('gets streaming response from async iterator', null, async ({ fetch }) => {
+		const res = await fetch('/endpoint-output/async-iterator');
+
+		assert.equal(await res.text(), 'foobar');
+	});
 }

packages/kit/test/apps/basics/src/routes/endpoint-output/async-iterator.js

@@ -0,0 +1,9 @@
+/** @type {import('@sveltejs/kit').RequestHandler} */
+export function get() {
+	return { body: generateAsyncIterator() };
+}
+
+async function* generateAsyncIterator() {
+	yield 'foo';
+	yield 'bar';
+}