public void LearningDuplicateLinesAreIgnored()
{
var model = new StringMarkov();
model.Learn(ExampleData);
model.Learn(ExampleData);
var e1 = ExampleData.Except(model.SourceLines).ToList();
Assert.AreEqual(ExampleData.Count(), model.SourceLines.Count);
Assert.That(ExampleData.ToList(), Is.EquivalentTo(model.SourceLines));
Assert.That(model.SourceLines, Is.Unique);
}