public void ObjectToString()
{
var edge1 = new SEquatableTaggedEdge <int, TestObject>(1, 2, null);
var edge2 = new SEquatableTaggedEdge <int, TestObject>(1, 2, new TestObject(42));
var edge3 = new SEquatableTaggedEdge <int, TestObject>(2, 1, null);
Assert.AreEqual("1 -> 2 (no tag)", edge1.ToString());
Assert.AreEqual("1 -> 2 (42)", edge2.ToString());
Assert.AreEqual("2 -> 1 (no tag)", edge3.ToString());
}
