public void CheckEmptyFieldsTest_WrongString_ReturnFalse()
        {
            DataValidation dataValidation = new DataValidation();
            bool           factResult;
            string         s1 = "";
            string         s2 = "";
            string         s3 = "";

            factResult = dataValidation.CheckEmptyFields(s1, s2, s3);
            Assert.IsFalse(factResult);
        }
        public void CheckEmptyFieldsTest_CorrectString_ReturnTrue()
        {
            DataValidation dataValidation = new DataValidation();
            bool           factResult;
            string         s1 = "qwerty";
            string         s2 = "123456";
            string         s3 = "123456";

            factResult = dataValidation.CheckEmptyFields(s1, s2, s3);
            Assert.IsTrue(factResult);
        }