Test for ddc async call timing

tests/language_strong/async_call_test.dart

+// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file

[Jennifer Messerly, 2017/01/29 09:10:59]

2017?

+// for details. 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:expect/expect.dart";
+
+var result = "";
+
+foo() {
+  result += "foo";
+}
+
+bar() async {
+  result += "bar";
+}
+
+main() async {
+  var f = new Future(foo);
+  var b = bar();
+  Expect.equals("", result);
+  scheduleMicrotask(() => result += "micro");
+  await b;
+  await f;
+
+  // Validates that bar is scheduled as a microtask, before foo.
+  Expect.equals("barmicrofoo", result);
+}