public void EmptyVertex() { var vertex = new AdjencyListVertex <double>(1.3); var vertex2 = new AdjencyListVertex <double>(1); Assert.AreEqual(1.3, vertex.Value); Assert.AreEqual(0, vertex.Count()); Assert.AreEqual(0, vertex.Neighbors().Count()); Assert.IsNull(vertex.GetEnumerator().Current); Assert.IsFalse(vertex.IsAdjacent(vertex2)); var iterator = vertex.GetEnumerator(); while (iterator.MoveNext()) { Assert.Fail(); } }