public void RemoveNeighboursTest() { Node <City> ct = new Node <City> (new City("war", "maz", "24351")); n.AddSuccessor(ct); n.AddPredecessor(ct); ct.RemoveNieghbours(); Assert.True(ct.predecessors.Count == 0); Assert.True(ct.successors.Count == 0); Assert.True(n.predecessors.Count == 0); Assert.True(n.successors.Count == 0); }