public void WriteGuidTest()
        {
            Guid g = Guid.NewGuid(); // not strictly deterministic but deterministic enough
            var guidBytes = g.ToByteArray();
            var fio = new Mock<IFileIO>(MockBehavior.Default);
            fio.Setup(io => io.WriteBytes(It.IsAny<byte[]>()));

            var fw = new FormattedWriter(fio.Object);
            fw.WriteGuid(g);

            fio.Verify(f => f.WriteBytes(It.IsAny<byte[]>()), Times.Once());
        }
        public void WriteGuidTest()
        {
            Guid g         = Guid.NewGuid(); // not strictly deterministic but deterministic enough
            var  guidBytes = g.ToByteArray();
            var  fio       = new Mock <IFileIO>(MockBehavior.Default);

            fio.Setup(io => io.WriteBytes(It.IsAny <byte[]>()));

            var fw = new FormattedWriter(fio.Object);

            fw.WriteGuid(g);

            fio.Verify(f => f.WriteBytes(It.IsAny <byte[]>()), Times.Once());
        }