public void IsOffspring()
{
Task child_1 = new Task();
Task child_2 = new Task();
Task parent_1 = new Task();
Task parent_2 = new Task();
Task grand_parent = new Task();
Task other = new Task();
parent_1.AddChild(child_1);
parent_1.AddChild(child_2);
grand_parent.AddChild(parent_1);
grand_parent.AddChild(parent_2);
Assert.That(child_1.IsOffspring(parent_1), Is.True);
Assert.That(child_2.IsOffspring(parent_1), Is.True);
Assert.That(parent_1.IsOffspring(parent_1), Is.False);
Assert.That(parent_2.IsOffspring(parent_1), Is.False);
Assert.That(grand_parent.IsOffspring(parent_1), Is.False);
Assert.That(other.IsOffspring(parent_1), Is.False);
Assert.That(child_1.IsOffspring(parent_2), Is.False);
Assert.That(child_2.IsOffspring(parent_2), Is.False);
Assert.That(parent_1.IsOffspring(parent_2), Is.False);
Assert.That(parent_2.IsOffspring(parent_2), Is.False);
Assert.That(grand_parent.IsOffspring(parent_1), Is.False);
Assert.That(other.IsOffspring(parent_1), Is.False);
Assert.That(child_1.IsOffspring(grand_parent), Is.True);
Assert.That(child_2.IsOffspring(grand_parent), Is.True);
Assert.That(parent_1.IsOffspring(grand_parent), Is.True);
Assert.That(parent_2.IsOffspring(grand_parent), Is.True);
Assert.That(grand_parent.IsOffspring(grand_parent), Is.False);
Assert.That(other.IsOffspring(grand_parent), Is.False);
}
