Format all tests.

tests/language/source_self_negative_test.dart

Index: tests/language/source_self_negative_test.dart
diff --git a/tests/language/source_self_negative_test.dart b/tests/language/source_self_negative_test.dart
index 176e1c41327d9c3990097a283d2a1b55cb75d504..b9b2e7e7dad3dc3060dae980b0afd5bf059551de 100644
--- a/tests/language/source_self_negative_test.dart
+++ b/tests/language/source_self_negative_test.dart
@@ -5,7 +5,8 @@
 // Dart test program importing the core library explicitly.
 
 library SourceSelfNegativeTest;
-part "source_self_negative_test.dart";  // recursive reference to self.
+
+part "source_self_negative_test.dart"; // recursive reference to self.
 
 main() {
   print('should not be able to recursively include self as library part');