From 00970710e0a22eb128646b82ea7ca4872453803f Mon Sep 17 00:00:00 2001
From: Mikkel Nygaard Ravn <mravn@google.com>
Date: Mon, 28 May 2018 17:35:51 +0200
Subject: [PATCH] [await sync-async flag] Add test of sync async execution
 (#16795)

---
 packages/flutter/test/engine/dart_test.dart | 26 +++++++++++++++++++++
 1 file changed, 26 insertions(+)
 create mode 100644 packages/flutter/test/engine/dart_test.dart

diff --git a/packages/flutter/test/engine/dart_test.dart b/packages/flutter/test/engine/dart_test.dart
new file mode 100644
index 00000000000..7efe12f9d13
--- /dev/null
+++ b/packages/flutter/test/engine/dart_test.dart
@@ -0,0 +1,26 @@
+// Copyright 2018 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:async';
+
+import 'package:test/test.dart';
+
+/// Verifies Dart semantics governed by flags set by Flutter tooling.
+void main() {
+  group('Async', () {
+    String greeting = 'hello';
+    Future<void> changeGreeting() async {
+      greeting += ' 1';
+      await new Future<void>.value(null);
+      greeting += ' 2';
+    }
+    test('execution of async method starts synchronously', () async {
+      expect(greeting, 'hello');
+      final Future<void> future = changeGreeting();
+      expect(greeting, 'hello 1');
+      await future;
+      expect(greeting, 'hello 1 2');
+    });
+  });
+}