var Array = []
Array.push({'test':'fuu','url':'sdfsdfsdf'});
Array.push({'test':'qsgbfdsbgsdfbgsfdgb','url':'sdfssffbgsfdbgdfsdf'});
if($.inArray('fuu',Array) != -1) alert('present');
else alert('absent');
alert($.inArray('fuu',Array));

var arr = [];
...
var found = false;
$.each(arr, function () {
   if (this.test === 'fuu') {
      found = true;
      return false;
   }
});
if (found) alert('present');

Array.push({'test':'fuu','url':'sdfsdfsdf'});

$.inArray('fuu',Array)

$.grep(Array, function(key) { return key.test == "fuu" }); // Object