Format all tests.

tests/language_strong/syncstar_yieldstar_test.dart

Index: tests/language_strong/syncstar_yieldstar_test.dart
diff --git a/tests/language_strong/syncstar_yieldstar_test.dart b/tests/language_strong/syncstar_yieldstar_test.dart
index 6a9ad921de1c71323fed92efed76f9298b1e20c9..82e7166e27a7349a0e3b9add69fcb8270c70a805 100644
--- a/tests/language_strong/syncstar_yieldstar_test.dart
+++ b/tests/language_strong/syncstar_yieldstar_test.dart
@@ -21,9 +21,9 @@ foo() sync* {
   yield null;
   // TODO(jmesserly): added cast here to work around:
   // https://codereview.chromium.org/1213503002/
-  yield* bar() as Iterable; 
+  yield* bar() as Iterable;
 }
 
-main () async {
+main() async {
   Expect.listEquals([1, 2, 3, null, 1, 1, 2, 3, 5], foo().take(9).toList());
 }