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

test/mjsunit/object-seal.js

 // Copyright 2010 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 73 matching lines @@
 assertEquals(42, desc.value);
 
 desc = Object.getOwnPropertyDescriptor(obj, 'z');
 assertTrue(desc.writable);
 assertFalse(desc.configurable);
 assertEquals("foobar", desc.value);
 
 // Since writable is not affected by seal we should still be able to
 // update the values.
 obj.x = "43";
-assertEquals(43, obj.x);
+assertEquals("43", obj.x);
 
 // Test on accessors.
 var obj2 = {};
 function get() { return 43; };
 function set() {};
 Object.defineProperty(obj2, 'x', { get: get, set: set, configurable: true });
 
 desc = Object.getOwnPropertyDescriptor(obj2, 'x');
 assertTrue(desc.configurable);
 assertEquals(undefined, desc.value);
@@ skipping 30 matching lines @@
 desc = Object.getOwnPropertyDescriptor(arr, '1');
 assertTrue(desc.configurable);
 assertTrue(desc.writable);
 assertEquals(43, desc.value);
 
 assertTrue(Object.isExtensible(arr));
 assertFalse(Object.isSealed(arr));
 Object.seal(arr);
 assertTrue(Object.isSealed(arr));
 assertFalse(Object.isExtensible(arr));
-// Since the values in the array is still writable this object 
+// Since the values in the array is still writable this object
 // is not frozen.
 assertFalse(Object.isFrozen(arr));
 
 desc = Object.getOwnPropertyDescriptor(arr, '0');
 assertFalse(desc.configurable);
 assertTrue(desc.writable);
 assertEquals(42, desc.value);
 
 desc = Object.getOwnPropertyDescriptor(arr, '1');
 assertFalse(desc.configurable);
@@ skipping 23 matching lines @@
 // Make sure that an object that has a configurable property
 // is not classified as sealed.
 var obj4 = {};
 Object.defineProperty(obj4, 'x', {configurable: true, writable: false});
 Object.defineProperty(obj4, 'y', {configurable: false, writable: false});
 Object.preventExtensions(obj4);
 
 assertFalse(Object.isSealed(obj4));
 
 // Make sure that Object.seal returns the sealed object.
-var obj4 = {}
-assertTrue(obj4 === Object.seal(obj4))
+var obj4 = {};
+assertTrue(obj4 === Object.seal(obj4));