public void DiaSemanaTest()
        {
            //Arrange
            var expected = DateTime.Now.Day.ToString();
            //Act
            var actual = CosasDeFechas.DiaSemana();

            //Assert
            Assert.AreEqual(expected, actual);
        }
        public void DiaSemanaTest()
        {
            //Arrange
            DateTime fecha    = new DateTime(2008, 4, 21);
            string   expected = "Monday";

            //Atc
            string actual = CosasDeFechas.DiaSemana(fecha);

            //Assert
            Assert.AreEqual(expected, actual);
        }