public void Next()
        {
            Mock<IRandomExtensions> randMock = new Mock<IRandomExtensions>();
            var target = new RandomByteDataSource(randMock.Object);
            target.Next(null);

            randMock.Verify(a => a.GetByte(System.Byte.MinValue, System.Byte.MaxValue), @"
            The GetByte method on the IRandomExtensions object was not called.
            ");
        }