Format all tests.

tests/language/string_interpolation7_test.dart

Index: tests/language/string_interpolation7_test.dart
diff --git a/tests/language/string_interpolation7_test.dart b/tests/language/string_interpolation7_test.dart
index 6f558d406afc1a694942052c06a5cf33194d820f..af8e276b42a9dd3d1df85a424b80c0d3ee4ad870 100644
--- a/tests/language/string_interpolation7_test.dart
+++ b/tests/language/string_interpolation7_test.dart
@@ -7,14 +7,14 @@ import "package:expect/expect.dart";
 // Dart test program testing string interpolation with toString on custom
 // classes and on null.
 
-
 class A {
   const A();
-  String toString() { return "A"; }
+  String toString() {
+    return "A";
+  }
 }
 
 class StringInterpolation7Test {
-
   static testMain() {
     A a = new A();
     Expect.equals("A + A", "$a + $a");