rem: isSet ( defaults, defaultsCopy, "Check if not modified: options1 must not be modified" ); isSet ( options1, options1Copy, "Check if not modified: options1 must not be modified" ); isSet ( options2, options2Copy, "Check if not modified: options2 must not be modified" ); 
add: isSet ( options, optionsCopy, "Check if not modified: options must not be modified" ); 
context: test("$.extend(Object, Object, Object, Object)", function() {	expect(4);	var defaults = { xnumber1: 5, xnumber2: 7, xstring1: "peter", xstring2: "pan" },		defaultsCopy = { xnumber1: 5, xnumber2: 7, xstring1: "peter", xstring2: "pan" },		options1 =     { xnumber2: 1, xstring2: "x" },		options1Copy = { xnumber2: 1, xstring2: "x" },		options2 =     { xstring2: "xx", xxx: "newstringx" },		options2Copy = { xstring2: "xx", xxx: "newstringx" },		merged = { xnumber1: 5, xnumber2: 1, xstring1: "peter", xstring2: "xx", xxx: "newstringx" };	var settings = jQuery.extend({}, defaults, options1, options2);	isSet( settings, merged, "Check if extended: settings must be extended" );	isSet ( defaults, defaultsCopy, "Check if not modified: options1 must not be modified" );	isSet ( options1, options1Copy, "Check if not modified: options1 must not be modified" );	isSet ( options2, options2Copy, "Check if not modified: options2 must not be modified" );});
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