public void CopyToTest()
{
using NativeString str = new NativeString("Hello".AsSpan());
Span <char> span = stackalloc char[5];
str.CopyTo(span, 0, 5);
Assert.AreEqual('H', span[0]);
Assert.AreEqual('e', span[1]);
Assert.AreEqual('l', span[2]);
Assert.AreEqual('l', span[3]);
Assert.AreEqual('o', span[4]);
}