public void CheckDateTest_IncorrectDay1_ReturnFalse()
        {
            DataValidation dataValidation = new DataValidation();
            bool           factResult;
            string         date = "35.12.2019";

            factResult = dataValidation.CheckDate(date);
            Assert.IsFalse(factResult);
        }
        public void CheckDateTest_CorrectDate1_ReturnTrue()
        {
            DataValidation dataValidation = new DataValidation();
            bool           factResult;
            string         date = "31.12.2019";

            factResult = dataValidation.CheckDate(date);
            Assert.IsTrue(factResult);
        }
        public void CheckDateTest_IncorrectMonth_ReturnFalse()
        {
            DataValidation dataValidation = new DataValidation();
            bool           factResult;
            string         date = "25.13.2020";

            factResult = dataValidation.CheckDate(date);
            Assert.IsFalse(factResult);
        }