Format all tests.

tests/language/assert_message_test.dart

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // 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.
 
 // SharedOptions=--assert-message
 
 import "dart:async";
 
 import "package:async_helper/async_helper.dart";
 import "package:expect/expect.dart";
@@ skipping 49 matching lines @@
   // Failing asserts evaluate message after test.
   var list = [];
   try {
     assert((list..add(1)).isEmpty, (list..add(3)).length);
   } on AssertionError catch (e) {
     Expect.equals(2, e.message);
     Expect.listEquals([1, 3], list);
   }
 
   asyncStart();
-  asyncTests().then((_) { asyncEnd(); });
+  asyncTests().then((_) {
+    asyncEnd();
+  });
 }
 
-
 Future asyncTests() async {
   // You can await in both condition and message.
   assert(true, await 0);
   assert(await true, 1);
   assert(await true, await 2);
 
   // Successful asserts won't await/evaluate message.
   void unreachable() => throw "unreachable";
   assert(await true, await unreachable());
 
@@ skipping 11 matching lines @@
   } on AssertionError catch (e) {
     Expect.equals(4, e.message);
   }
 
   try {
     assert(await falseFuture, await new Future.error("error"));
   } on String catch (e) {
     Expect.equals("error", e);
   }
 }