public void ShouldOpenFileAndReadStream()
{
var mockstream = new Mock <Stream>();
mockstream.Setup(x => x.CanRead).Returns(true);
var streamreader = new StreamReader(mockstream.Object);
_csvReader.Open(Filename);
var stream = _csvReader.GetStream();
Assert.That(stream, Is.EqualTo(streamreader));
_csvReader.Close();
}