public void Test_UUid64_WriteTo()
{
var original = Uuid64.Parse("01234567-89ABCDEF");
Assume.That(original.ToUInt64(), Is.EqualTo(0x0123456789ABCDEF));
// span with more space
var scratch = Slice.Repeat(0xAA, 16);
original.WriteTo(scratch);
Assert.That(scratch.ToString("X"), Is.EqualTo("01 23 45 67 89 AB CD EF AA AA AA AA AA AA AA AA"));
// span with no offset and exact size
scratch = Slice.Repeat(0xAA, 16);
original.WriteTo(scratch.Substring(0, 8));
Assert.That(scratch.ToString("X"), Is.EqualTo("01 23 45 67 89 AB CD EF AA AA AA AA AA AA AA AA"));
// span with offset
scratch = Slice.Repeat(0xAA, 16);
original.WriteTo(scratch.Substring(4));
Assert.That(scratch.ToString("X"), Is.EqualTo("AA AA AA AA 01 23 45 67 89 AB CD EF AA AA AA AA"));
// span with offset and exact size
scratch = Slice.Repeat(0xAA, 16);
original.WriteTo(scratch.Substring(4, 8));
Assert.That(scratch.ToString("X"), Is.EqualTo("AA AA AA AA 01 23 45 67 89 AB CD EF AA AA AA AA"));
scratch = Slice.Repeat(0xAA, 16);
original.WriteToUnsafe(scratch.Array, scratch.Offset);
Assert.That(scratch.ToString("X"), Is.EqualTo("01 23 45 67 89 AB CD EF AA AA AA AA AA AA AA AA"));
unsafe
{
byte *buf = stackalloc byte[16];
UnsafeHelpers.FillUnsafe(buf, 16, 0xAA);
original.WriteToUnsafe(buf + 2);
Assert.That(Slice.Copy(buf, 16).ToString("X"), Is.EqualTo("AA AA 01 23 45 67 89 AB CD EF AA AA AA AA AA AA"));
}
// errors
Assert.That(() => original.WriteTo(Slice.Empty), Throws.InstanceOf <ArgumentException>(), "Target buffer is empty");
Assert.That(() => original.WriteTo(null, 8), Throws.InstanceOf <ArgumentException>(), "Target buffer is null");
Assert.That(() => original.WriteTo(null, 0), Throws.InstanceOf <ArgumentException>(), "Target buffer is null");
scratch = Slice.Repeat(0xAA, 16);
Assert.That(() => original.WriteTo(scratch.Substring(0, 7)), Throws.InstanceOf <ArgumentException>(), "Target buffer is too small");
Assert.That(scratch.ToString("X"), Is.EqualTo("AA AA AA AA AA AA AA AA AA AA AA AA AA AA AA AA"), "Buffer should not have been overwritten!");
}