def test_can_remove_edge():
    graph = Graph()
    graph.addNode("start")
    graph.addNode("end")
    graph.addEdge("start", "end")
    output = graph.removeEdge("start", "end")
    assert output == True
def test_can_find_edge():
    graph = Graph()
    graph.addNode("start")
    graph.addNode("end")
    graph.addEdge("start", "end")
    output = graph.findEdge("start", "end")
    assert output == True