Validation Sınıfı:

var Validation = function() {

};

Validation.prototype.isValidEmail= function (string) {
    var at="@";
    var dot=".";
    var indexAt= string.indexOf(at);
    var indexDot= string.indexOf(dot,indexAt);
    var tempString;
    regEx = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;

    if(string) {
        //osman.yuksel@tart tarzında bir e-posta için kontrol.
        //@'den sonra hiç nokta yoksa invalid.
        if(string.indexOf(dot,indexAt)== -1){
            return "invalid e-mail alert 1";
        }
        //@'den sonra en az bir nokta varsa.
        else if(string.indexOf(dot,indexAt)!= -1) {
        //eğer bir nokta varsa.
            if(string.indexOf(dot, (indexDot+1))== -1) {
                //o noktadan sonraki alan 4 karakterden büyük olmamalı.
                tempString = string.substring(indexDot+1);
                if(tempString.length>4) {
                    return "invalid e-mail alert 2";
                }
            }
            //eğer iki nokta varsa.
            else{
                var secondDot= string.indexOf(dot,(indexDot+1));
                //ikinci noktadan sonraki alan 4 karakterden büyük olmamalı.
                tempString=string.substring(secondDot+1);
                if(tempString.length>4) {
                    return "invalid e-mail alert 2";
                }
            }
        }
        //türkçe karakterler varsa invalid.
         if(!regEx.test(string)){
           return "invalid e-mail alert 3";
        }
            return true;
    }
};

Validation.prototype.isValidNameSurname= function(string){
    var dot=".";
	regEx=/\s/;

	 if((string.length) > 30){
        return "invalid name&surname alert 2";
    }
	//isim soy isim kombinasyonunda en az bir boşluk olmalı ve boşluk yerine nokta konmamalı.
    if(!regEx.test(string)  || string.indexOf(dot,0) != -1) {
		return "invalid name&surname alert 1";
    }
	else {
		return true;
	}
};

Validation.prototype.isValidZipCode= function(string){
	regEx=/\s/;
	regEx2=/[^0-9]/;
    //boşluk içeren sayı kombinasyonu valid olmamalı.
	if(regEx.test(string)){
		return "invalid zipcode alert 1";
	}
	//sadece sayılardan oluşmalı.
	 if(regEx2.test(string)){
        return "invalid zipcode alert 2";
    }
    if( (string.length) != 5){
		return "invalid zipcode alert 3";
	}
	else {
	return true;
	}
};


Validation Testleri:

describe("E-mail Validation", function () {
    var emailValidation;
	beforeEach(function (){
	emailValidation = new Validation();
	});

	describe("For e-mail validation", function () {

		it("should return invalid e-mail alert 1 with osman.yuksel@tart", function (){
			var result = emailValidation.isValidEmail("osman.yuksel@tart");
			expect(result).toEqual("invalid e-mail alert 1");
		});

		it("should return invalid e-mail alert 2 with osman.yuksel@tart.com.local", function (){
			var result = emailValidation.isValidEmail("osman.yuksel@tart.com.local");
			expect(result).toEqual("invalid e-mail alert 2");
		});

		it("should return invalid e-mail alert 3 with osman.yüksel@tart.com.tr", function (){
			var result = emailValidation.isValidEmail("osman.yüksel@tart.com.tr");
			expect(result).toEqual("invalid e-mail alert 3");
		});

		it("should return true with osman.yuksel@tart.com.tr", function (){
			var result = emailValidation.isValidEmail("osman.yuksel@tart.com.tr");
			expect(result).toEqual(true);
		});
    });
});

describe("Name&Surname Validation", function () {

	var namesurnameValidation;
	beforeEach(function (){
		namesurnameValidation = new Validation();
	});

	describe("For name&surname validation", function () {

		it("should return invalid name&surname alert 1 with Osman.Yuksel", function (){
			var result = namesurnameValidation.isValidNameSurname("Osman.Yuksel");
			expect(result).toEqual("invalid name&surname alert 1");
		});

                it("should return invalid name&surname alert 2 with merhaba millet ben otuz karakterden buyugum", function (){
			var result = namesurnameValidation.isValidNameSurname("merhaba millet ben otuz karakterden buyugum");
			expect(result).toEqual("invalid name&surname alert 2");
		});

         it("should return true with Osman Yuksel", function (){
			var result = namesurnameValidation.isValidNameSurname("Osman Yuksel");
			expect(result).toEqual(true);
		});
	});
});

describe("ZipCode Validation", function () {

			var zipcodeValidation;
			beforeEach(function (){
				zipcodeValidation = new Validation();
			});

	describe("For zipcode validation", function () {

		it("should return invalid zipcode alert 1 with 12 34", function (){
			var result = zipcodeValidation.isValidZipCode("12 34");
			expect(result).toEqual("invalid zipcode alert 1");
		});

                it("should return invalid zipcode alert 2 with abcde", function (){
			var result = zipcodeValidation.isValidZipCode("abcde");
			expect(result).toEqual("invalid zipcode alert 2");
		});

		it("should return invalid zip code alert 3 with 123456", function (){
			var result = zipcodeValidation.isValidZipCode("123456");
			expect(result).toEqual("invalid zipcode alert 3");
		});

		it("should return true with 12345", function (){
			var result = zipcodeValidation.isValidZipCode("12345");
			expect(result).toEqual(true);
		});
	});
});