public void CanItemHeaderGetItemBufferWithRawHeaderData(SecsFormat expectedSecsFormat, int expectedItemLength, byte expectedNumberOfLengthBytes, byte expectedRawHeaderDataSize)
{
ItemHeader itemHeader = new ItemHeader(expectedSecsFormat, expectedItemLength);
byte[] expectedItemBufferWithRawHeaderData = new byte[expectedRawHeaderDataSize + expectedItemLength];
expectedItemBufferWithRawHeaderData[0] = (byte)((int)expectedSecsFormat | expectedNumberOfLengthBytes);
switch (expectedNumberOfLengthBytes)
{
case 1:
expectedItemBufferWithRawHeaderData[1] = (byte)expectedItemLength;
break;
case 2:
expectedItemBufferWithRawHeaderData[1] = (byte)(expectedItemLength >> 8);
expectedItemBufferWithRawHeaderData[2] = (byte)expectedItemLength;
break;
case 3:
expectedItemBufferWithRawHeaderData[1] = (byte)(expectedItemLength >> 16);
expectedItemBufferWithRawHeaderData[2] = (byte)(expectedItemLength >> 8);
expectedItemBufferWithRawHeaderData[3] = (byte)expectedItemLength;
break;
default:
throw new ArgumentOutOfRangeException(nameof(expectedNumberOfLengthBytes), expectedNumberOfLengthBytes, "The argument must be 1, 2 or 3.");
}
var(actualItemBufferWithRawHeaderData, actualOffset) = itemHeader.GetItemBufferWithRawHeaderData();
Assert.AreEqual(expectedRawHeaderDataSize, actualOffset, nameof(actualOffset));
CollectionAssert.AreEqual(expectedItemBufferWithRawHeaderData, actualItemBufferWithRawHeaderData);
}