public void ChecksummRoundtip()
{
var b = new byte[255];
var r = new Random();
r.NextBytes(b);
var c = new Checksum();
b[254] = 0;
c.CalcAndApply(b);
Assert.IsTrue(c.Check(b, 0, b.Length));
}
public void ChecksummDoubleApply()
{
var b = new Byte[] { 1, 2, 3, 4, 5 };
var c = new Checksum();
try
{
c.CalcAndApply(b);
Assert.Fail("Error expected");
} catch (ArgumentException) { }
b[4] = 0;
c.CalcAndApply(b);
Assert.AreEqual(246, b[4]);
try
{
c.CalcAndApply(b);
Assert.Fail("Error expected");
} catch (ArgumentException) { }
Assert.IsTrue(c.Check(b, 0, b.Length));
}