public unsafe void Length_Growing_SetsNulls()
{
const string Text1 = "foobar";
var vsb = new ValueStringBuilder();
// Shrink then grow within capacity
vsb.Append(Text1);
Assert.Equal(Text1.Length, vsb.Length);
vsb.Length = 3;
Assert.Equal(3, vsb.Length);
vsb.Length = 6;
Assert.Equal(6, vsb.Length);
Assert.Equal("foo\0\0\0", vsb.ToString());
// Grow over capacity
const string Text2 = "bar";
Span <char> stackSpace = stackalloc char[Text2.Length];
var vsb2 = new ValueStringBuilder(stackSpace);
Assert.Equal(0, vsb2.Length);
vsb2.Append(Text2);
Assert.True(Text2.AsReadOnlySpan().SequenceEqual(stackSpace), "existing stack buffer should have been used");
Assert.Equal(Text2.Length, vsb2.Length);
vsb2.Length = 6;
Assert.Equal(6, vsb2.Length);
Assert.Equal("bar\0\0\0", vsb2.ToString());
}