Format all tests.

tests/language_strong/operator_equals_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // Regression test for dart2js that used to infer [:super == null:]
 // always returns an int.
 
 import 'package:expect/expect.dart';
 
 class A {
-  operator==(other) => 42;
+  operator ==(other) => 42;
 }
 
 class B extends A {
   foo() => (super == null) + 4;
 }
 
 main() {
   Expect.throws(() => new B().foo(), (e) => e is NoSuchMethodError);
 }