public void ShouldCountLines()
{
var file = Path.Combine(_testRoot, "x.txt");
CreateContentInFile(file, 0);
Assert.AreEqual(0, _sut.CountLines(file));
CreateContentInFile(file, 1);
Assert.AreEqual(1, _sut.CountLines(file));
CreateContentInFile(file, 10);
Assert.AreEqual(10, _sut.CountLines(file));
}