public void AddPredecessor_AddedPredecessorNull_ThrowsArgumentNullException()
{
// arrange
ConcreteNode testNode = new ConcreteNode(0, 0, "testNode");
// act
testNode.AddPredecessor(null);
}
public void AddPredecessor_PredecessorAddedFirstTime_PredecessorAddedToPredecessors()
{
// arrange
ConcreteNode testNode = new ConcreteNode(0, 0, "testNode");
StubNode predecessor = new StubNode();
// act
testNode.AddPredecessor(predecessor);
// assert
Assert.IsTrue(testNode.Predecessors.Contains(predecessor));
}
public void AddPredecessor_PredecessorAddedTwice_SecondPredecessorNotAddedToPredecessors()
{
// arrange
ConcreteNode testNode = new ConcreteNode(0, 0, "testNode");
StubNode predecessor = new StubNode();
// act
testNode.AddPredecessor(predecessor);
testNode.AddPredecessor(predecessor);
// assert
Assert.AreEqual(1, testNode.Predecessors.Where(pred => pred.Equals(predecessor)).Count());
}