public unsafe void RawStringSlice()
{
const int memLen = 5;
var mem = stackalloc byte[memLen]
{
(byte)'a', (byte)'b', (byte)'c', (byte)'d', (byte)'e',
};
var abcde = new RawString((IntPtr)mem, memLen);
var abc = new RawString((IntPtr)mem, 3);
var cd = new RawString((IntPtr)(mem + 2), 2);
var de = new RawString((IntPtr)(mem + 3), 2);
AssertEqual(abcde.Slice(0, abcde.Length), abcde);
AssertEqual(abcde.Slice(0, 3), abc);
AssertEqual(abcde.Slice(2, 2), cd);
AssertEqual(abcde.Slice(3, 2), de);
AssertEqual(abcde.Slice(3), de);
AssertEqual(abcde.Slice(0), abcde);
Assert.True(abcde.Slice(5).IsEmpty);
Assert.True(abcde.Slice(5, 0).IsEmpty);
AssertEqual(abcde.AsSpan(0, abcde.Length), abcde);
AssertEqual(abcde.AsSpan(0, 3), abc);
AssertEqual(abcde.AsSpan(2, 2), cd);
AssertEqual(abcde.AsSpan(3, 2), de);
AssertEqual(abcde.AsSpan(3), de);
AssertEqual(abcde.AsSpan(0), abcde);
Assert.True(abcde.AsSpan(5).IsEmpty);
Assert.True(abcde.AsSpan(5, 0).IsEmpty);
}