[Javascript] Test you code proferemce!! SpeedTestClass

/**
    Retrieving and using numerical time data
*/
var rightnow = new Date();
console.log(rightnow); //Tue Aug 12 2014 22:07:01 GMT+0300 (FLE Daylight Time)

console.log(+rightnow); //-->console.log(new Number(rightnow));
//1407870464483

//So what you can do is:
var rightNow = +new Date();
var endTime = +new Date();
var elapsedTime = endTime - rightNow;

/**
    Test class
*/
function SpeedTest(testImplement, testParams, repetitions){
    this.testImplement = testImplement;
    this.testParams = testParams;
    this.repetitions = repetitions || 10000;
    this.average = 0;
}

SpeedTest.prototype = {
    startTest: function(){
        var beginTime, endTime, sumTime = 0;
        for(var i = 0, x = this.repetitions; i < x; i++){
            beginTime = +new Date();
            this.testImplement(this.testParams);
            endTime = +new Date();
            sumTime += endTime - beginTime;
        }
        this.average = sumTime / this.repetitions;
        return console.log("Average execution across "+
                            this.repetitions+": "+
                            this.average);
    }
}
/**
End test class
*/

function Knight(name, regiment){
    this.name = name;
    this.regiment = regiment;
    switch(regiment){
        case 1:
            this.weapon = "broadward";
        break;
        case 2:
            this.weapon = "Claymore";
        break;
        case 3:
            this.weapon = "Lonpword";
        break;
        case 5:
            this.weapon = "War Hamer";
        break;
        case 6:
            this.weapon = "Mattle air";
        break;
        case 4:
        case 7:
        case 8:
            this.weapon = "Morning star";
        break;
        case "King":
            this.weapon = "Rockman";
            break;
        default:
            alert("nope");
    }
}

/*
    For test
    //bad version
*/
var firstRegimentNewbs = ["Grimble Horsehead","Jark Winterborn","Bunder Ropefist", "Grils"];
var firstRegimentKnights = [];
var listForTests = [firstRegimentNewbs, firstRegimentKnights];
var noBP = function(listOfParam){
    for(var i = 0; i < listOfParam[0].length; i++){
        var newGuy = new Knight(listOfParam[0][i], 1);
        listOfParam[1].push(newGuy);
    }    
};
var noBPtest = new SpeedTest(noBP, listForTests);
noBPtest.startTest();
//Average execution across 10000: 0.0041
var noBPtest = new SpeedTest(noBP, listForTests, 500000);
noBPtest.startTest();
//Average execution across 100000: 0.00478

//
//Good version
//
var BP = function(listOfParam){
    for(var i = 0, x = listOfParam[0].length; i < x; i++){
        listOfParam[1].push(new Knight(listOfParam[0][i], 1));
    }    
};
var BPtest = new SpeedTest(BP, listForTests, 500000);
BPtest.startTest();
//Average execution across 100000: 0.00274