public void TestDetectNoPreamble()
{
using (var stream = new MemoryStream())
using (var writer = new StreamWriter(stream, Encoding.ASCII))
{
writer.Write("Controversial opinion: White House Down is a better movie than Olympus has Fallen, ikr");
writer.Flush();
stream.Position = 0;
var detector = new EncodingDetector();
detector.TryFindEncoding(stream).Should().Be(null, "because there's no preamble to detect ASCII and the detector shall not make any guesses and give up");
}
}
public void TestDetect([ValueSource(nameof(EncodingsWithPreamble))] Encoding encoding)
{
var preamble = encoding.GetPreamble();
preamble.Length.Should().BeGreaterOrEqualTo(1, "because this test doesn't make much sense if the encoding has no preamble");
using (var stream = new MemoryStream())
using (var writer = new StreamWriter(stream, encoding))
{
writer.Write("Controversial opinion: White House Down is a better movie than Olympus has Fallen, ikr");
writer.Flush();
stream.Position = 0;
var detector = new EncodingDetector();
detector.TryFindEncoding(stream).Should().Be(encoding);
}
}
private Encoding DetectEncoding(string fileName)
{
var detector = new EncodingDetector();
return(detector.TryFindEncoding(fileName) ?? Encoding.UTF8);
}