public void TestThreeLines([ValueSource(nameof(Encodings))] Encoding encoding,
[Values(1, 2, 4, 8, 16)] int bufferSize)
{
var writer = new StreamWriter(_stream, encoding, bufferSize);
var line1 = "This\n";
var line2 = "is\n";
var line3 = "crazy";
writer.Write(line1);
writer.Write(line2);
writer.Write(line3);
writer.Flush();
_stream.Position = 0;
var preamble = encoding.GetPreamble();
var detector = new LineOffsetDetector(_stream, encoding);
var offset1 = detector.FindNextLineOffset();
offset1.Should().Be(preamble.Length + encoding.GetByteCount(line1));
var offset2 = detector.FindNextLineOffset();
offset2.Should().Be(offset1 + encoding.GetByteCount(line2));
detector.FindNextLineOffset().Should().Be(-1, "because we're at the end and there's no newlines anymore");
}
public void TestOneCharacter([ValueSource(nameof(Encodings))] Encoding encoding)
{
var writer = new StreamWriter(_stream, encoding);
var line = "A";
writer.Write(line);
writer.Flush();
_stream.Position = 0;
var detector = new LineOffsetDetector(_stream, encoding);
detector.FindNextLineOffset().Should().Be(-1, "because we're at the end and there's no newlines");
detector.FindNextLineOffset().Should().Be(-1, "because we're at the end and there's no newlines");
}
public void TestSentenceWithNewline([ValueSource(nameof(Encodings))] Encoding encoding)
{
var writer = new StreamWriter(_stream, encoding);
var line = "This is a lazy sentence\n";
writer.Write(line);
writer.Flush();
_stream.Position = 0;
var preamble = encoding.GetPreamble();
var detector = new LineOffsetDetector(_stream, encoding);
var offset = detector.FindNextLineOffset();
offset.Should().Be(preamble.Length + encoding.GetByteCount(line));
detector.FindNextLineOffset().Should().Be(-1, "because we're at the end and there's no newlines anymore");
}
public void TestEmpty([ValueSource(nameof(Encodings))] Encoding encoding)
{
var detector = new LineOffsetDetector(_stream, encoding);
detector.FindNextLineOffset().Should().Be(-1);
}