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

test/mjsunit/string-index.js

 // Copyright 2008 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 43 matching lines @@
 
 foo[0] = "f";
 assertEquals("Foo", foo);
 
 foo[3] = "t";
 assertEquals("Foo", foo);
 assertEquals("undefined", typeof(foo[3]), "out of range");
 assertEquals("undefined", typeof(foo[-2]), "negative index");
 
 var S = new String("foo");
-assertEquals("foo", S);
+assertEquals(Object("foo"), S);
 assertEquals("f", S[0], "string object");
 assertEquals("f", S["0"], "string object");
 S[0] = 'bente';
 assertEquals("f", S[0], "string object");
 assertEquals("f", S["0"], "string object");
 S[-2] = 'spider';
 assertEquals('spider', S[-2]);
 S[3] = 'monkey';
 assertEquals('monkey', S[3]);
 S['foo'] = 'Fu';
@@ skipping 49 matching lines @@
 //assertEquals(false, "-1" in "foo", '"-1" in');
 //assertEquals(true, "2" in "foo", '"2" in');
 //assertEquals(false, "3" in "foo", '"3" in');
 
 delete S[3];
 assertEquals("undefined", typeof(S[3]));
 assertEquals(false, 3 in S);
 assertEquals(false, "3" in S);
 
 var N = new Number(43);
-assertEquals(43, N);
+assertEquals(Object(43), N);
 N[-2] = "Alpha";
 assertEquals("Alpha", N[-2]);
 N[0] = "Zappa";
 assertEquals("Zappa", N[0]);
 assertEquals("Zappa", N["0"]);
 
 var A = ["V", "e", "t", "t", "e", "r"];
 var A2 = (A[0] = "v");
 assertEquals('v', A[0]);
 assertEquals('v', A2);
@@ skipping 105 matching lines @@
   assertEquals(expected, actual);
 }
 
 // Test two byte string.
 var str = '\u0427', arr = ['\u0427'];
 for (var i = 0; i < 50; ++i) {
   var expected = arr[0];
   var actual = str[0];
   assertEquals(expected, actual);
 }