public async Task CharIndexToStreamPositionTest_TooBigIdx()
{
StreamTextAccess buf = new StreamTextAccess(
S().Add('a', blockSz).ToStream(Encoding.UTF8),
Encoding.UTF8
);
await buf.BeginReading(0, TextAccessDirection.Forward);
Assert.Throws <ArgumentOutOfRangeException>(() => buf.CharIndexToPosition(blockSz + 10));
}
public void CharIndexToStreamPositionTest_NegativeIdx()
{
StreamTextAccess buf = new StreamTextAccess(
S().Add('a', blockSz).ToStream(Encoding.UTF8),
Encoding.UTF8
);
buf.BeginReading(0, TextAccessDirection.Forward);
Assert.Throws <ArgumentOutOfRangeException>(() => buf.CharIndexToPosition(-1));
}
static void TestCharPosMapping(StreamTextAccess sut, TextStreamPosition pos, int charIdx)
{
Assert.AreEqual(pos.Value, sut.CharIndexToPosition(charIdx).Value);
Assert.AreEqual(charIdx, sut.PositionToCharIndex(pos));
}