Format all tests.

tests/lib/async/future_value_chain4_test.dart

Index: tests/lib/async/future_value_chain4_test.dart
diff --git a/tests/lib/async/future_value_chain4_test.dart b/tests/lib/async/future_value_chain4_test.dart
index 2c909cfa2b194e93cb69cb0d697c51e841b2142e..38952e9c33ab2c218073bc1cbaef467b9f7991ae 100644
--- a/tests/lib/async/future_value_chain4_test.dart
+++ b/tests/lib/async/future_value_chain4_test.dart
@@ -8,8 +8,11 @@ import 'dart:async';
 
 class MyFuture implements Future {
   then(valueHandler, {onError}) {
-    scheduleMicrotask(() { valueHandler(499); });
+    scheduleMicrotask(() {
+      valueHandler(499);
+    });
   }
+
   catchError(_, {test}) => null;
   whenComplete(_) => null;
   asStream() => null;