public void ReadsData()
{
string targetString = "OK";
byte[] bytes = Encoding.ASCII.GetBytes(targetString + '\0');
Mock <ILibc> mock = new Mock <ILibc>();
mock.Setup(o => o.Read(It.IsAny <int>(), It.IsAny <IntPtr>(), It.IsAny <IntPtr>()))
.Returns(new IntPtr(1))
.Callback <int, IntPtr, IntPtr>((i, p, c) => Marshal.Copy(bytes, 0, p, bytes.Length));
SerialCommunication serial = new SerialCommunication(mock.Object);
serial.Open("dummy");
string received = serial.ReadOnce();
Assert.AreEqual(targetString, received);
}