Format all tests.

tests/language_strong/default_implementation_test.dart

Index: tests/language_strong/default_implementation_test.dart
diff --git a/tests/language_strong/default_implementation_test.dart b/tests/language_strong/default_implementation_test.dart
index 51a221009105021bd5270645199712e6349eb619..a05f5dd89441a3d06fca2f6e94d94a17a6c8f8d5 100644
--- a/tests/language_strong/default_implementation_test.dart
+++ b/tests/language_strong/default_implementation_test.dart
@@ -13,7 +13,9 @@ abstract class Point {
 }
 
 class PointImplementation implements Point {
-  const PointImplementation(int x, int y) : this.x = x, this.y = y;
+  const PointImplementation(int x, int y)
+      : this.x = x,
+        this.y = y;
   final int x;
   final int y;
 }