public void Should_Throw_Exception_When_Size_Is_Greater_Than_1000()
        {
            const int size = 1050;

            try
            {
                var cloudBlockStorageValidator = new CloudBlockStorageValidator();
                cloudBlockStorageValidator.ValidateVolumeSize(size);
                Assert.Fail("Expected  was not thrown.");
            }
            catch (Exception exc)
            {
                Assert.IsTrue(exc is InvalidVolumeSizeException);
            }
        }
        public void Should_Not_Throw_Exception_When_Size_Is_In_Range()
        {
            const int size = 900;

            try
            {
                var cloudBlockStorageValidator = new CloudBlockStorageValidator();
                cloudBlockStorageValidator.ValidateVolumeSize(size);
            }
            catch (Exception)
            {

                Assert.Fail("Exception should not be thrown.");
            }
        }