public void ShouldReturnErrorWhenCommandIsInvalid()
        {
            var command = new CreateComparisonCommand();

            command.Validate();
            Assert.IsTrue(command.Invalid);
        }
        public void ShouldReturnErrorWhenCommandIsValid()
        {
            var command = new CreateComparisonCommand();

            command.Consumption = 3500;
            command.Validate();
            Assert.IsTrue(command.Valid);
        }