public void Builder_Without_Path_Should_Throw_IndexOutOfRangeException()
{
var model = new Builder();
var pathHistory = new PathHistory(model);
Assert.Throws <IndexOutOfRangeException>(() => pathHistory.Last());
}
public void Builder_With_Multiple_Steps_Should_Return_The_Last_One()
{
var model = new Builder();
var pathHistory = new PathHistory(model);
model.Path.Increase(new Pillar(0, 0));
model.Path.Increase(new Pillar(2, 1));
model.Path.Increase(new Pillar(4, 2));
model.Path.Increase(new Pillar(6, 3));
model.Path.Increase(new Pillar(8, 4));
var actual = pathHistory.Last();
Assert.That(actual.X, Is.EqualTo(8), "pillar.X");
Assert.That(actual.Y, Is.EqualTo(4), "pillar.Y");
}