Cleanup of mjsunit.js code and make assertEquals more strict.

test/mjsunit/cyrillic.js

 // Copyright 2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 169 matching lines @@
   var suffix = add_non_ascii_character_to_subject ? "\ufffe" : "";
   // A range that covers both ASCII and non-ASCII.
   for (var i = 0; i < 2; i++) {
     var full = (i != 0);
     var mixed = full ? "[a-\uffff]" : "[a-" + cyrillic.LAST + "]";
     var f = full ? "f" : "c";
     for (var j = 0; j < 2; j++) {
       var ignore_case = (j == 0);
       var flag = ignore_case ? "i" : "";
       var re = new RegExp(mixed, flag);
-      assertEquals(ignore_case || (full && add_non_ascii_character_to_subject),
-                   re.test("A" + suffix),
-                   58 + flag + f);
+      var expected =
+          ignore_case || (full && !!add_non_ascii_character_to_subject);
+      assertEquals(expected, re.test("A" + suffix), 58 + flag + f);
       assertTrue(re.test("a" + suffix), 59 + flag + f);
       assertTrue(re.test("~" + suffix), 60 + flag + f);
       assertTrue(re.test(cyrillic.MIDDLE), 61 + flag + f);
       assertEquals(ignore_case || full, re.test(cyrillic.middle), 62 + flag + f);
     }
   }
 }