Format all tests.

tests/language/rewrite_assign_test.dart

Index: tests/language/rewrite_assign_test.dart
diff --git a/tests/language/rewrite_assign_test.dart b/tests/language/rewrite_assign_test.dart
index 5379a6ca35bf171a8d2f276529597b1355e26a57..2a51f683f65afa8860a380f8cf75d857a447fcc0 100644
--- a/tests/language/rewrite_assign_test.dart
+++ b/tests/language/rewrite_assign_test.dart
@@ -4,7 +4,7 @@
 
 import "package:expect/expect.dart";
 
-bar(x,y) {}
+bar(x, y) {}
 
 foo(b) {
   var x, y;
@@ -15,12 +15,12 @@ foo(b) {
     x = 2;
     y = 1;
   }
-  bar(x,y);
-  bar(x,y);
+  bar(x, y);
+  bar(x, y);
   return x;
 }
 
 main() {
-    Expect.equals(1, foo(true));
-    Expect.equals(2, foo(false));
+  Expect.equals(1, foo(true));
+  Expect.equals(2, foo(false));
 }