Format all tests.

tests/language_strong/enum_test.dart

Index: tests/language_strong/enum_test.dart
diff --git a/tests/language_strong/enum_test.dart b/tests/language_strong/enum_test.dart
index 84daba1143b034f0ad499ecf0727e9c5e1e19da8..583e15bdf1add90e057e2e75f8b464d53152fa40 100644
--- a/tests/language_strong/enum_test.dart
+++ b/tests/language_strong/enum_test.dart
@@ -9,7 +9,10 @@ import 'package:expect/expect.dart';
 enum Enum1 { _ }
 enum Enum2 { A }
 enum Enum3 { B, C }
-enum Enum4 { D, E, }
+enum Enum4 {
+  D,
+  E,
+}
 enum Enum5 { F, G, H }
 
 main() {
@@ -107,4 +110,4 @@ test5(Enum5 e) {
       break;
   }
   Expect.equals(e.index, index);
-}
+}