internal static void Check(TestContext tc, string testname, int minwidth, int tabwidth, int padding, byte padchar,
TabWriter.Formatting flags, ustring src, ustring expected)
{
var b = new Buffer();
b.Init(1000);
var w = new TabWriter();
w.Init(b, minwidth, tabwidth, padding, padchar, flags);
// write all at once
var title = testname + " (written all at once)";
b.Clear();
Write(title, w, src);
Verify(tc, title, w, b, src, expected);
// write byte-by-byte
title = testname + " (written byte-by-byte)";
b.Clear();
for (var i = 0; i < src.Length; i++)
{
Write(title, w, src.ToByteArray().Slice(i, i + 1).ToArray());
}
Verify(tc, title, w, b, src, expected);
// write using Fibonacci slice sizes
title = testname + " (written in fibonacci slices)";
b.Clear();
for (var(i, d) = (0, 0); i < src.Length;)
