public void CanItemHeaderWriteRawHeaderData(SecsFormat expectedSecsFormat, int expectedItemLength, byte expectedNumberOfLengthBytes, byte expectedRawHeaderDataSize)
{
ItemHeader itemHeader = new ItemHeader(expectedSecsFormat, expectedItemLength);
byte[] expectedRawHeaderData = new byte[expectedRawHeaderDataSize];
expectedRawHeaderData[0] = (byte)((int)expectedSecsFormat | expectedNumberOfLengthBytes);
switch (expectedNumberOfLengthBytes)
{
case 1:
expectedRawHeaderData[1] = (byte)expectedItemLength;
break;
case 2:
expectedRawHeaderData[1] = (byte)(expectedItemLength >> 8);
expectedRawHeaderData[2] = (byte)expectedItemLength;
break;
case 3:
expectedRawHeaderData[1] = (byte)(expectedItemLength >> 16);
expectedRawHeaderData[2] = (byte)(expectedItemLength >> 8);
expectedRawHeaderData[3] = (byte)expectedItemLength;
break;
default:
throw new ArgumentOutOfRangeException(nameof(expectedNumberOfLengthBytes), expectedNumberOfLengthBytes, "The argument must be 1, 2 or 3.");
}
byte[] actualRawHeaderData = new byte[expectedRawHeaderData.Length];
itemHeader.WriteRawHeaderData(actualRawHeaderData, 0);
CollectionAssert.AreEqual(expectedRawHeaderData, actualRawHeaderData);
}