def test_01_vertex_methods(self):
### degree ###
vertex = Vertex('a')
vertex.adj['b'] = 1
assert vertex.degree() == 1
vertex.adj['c'] = 3
assert vertex.degree() == 2
### visit/reset ###
assert not vertex.visited
vertex.visit()
assert vertex.visited
vertex.reset()
assert not vertex.visited
### get_edges ###
vertex = Vertex('a')
solution = [('b', 1), ('c', 2)]
vertex.adj['b'] = 1
vertex.adj['c'] = 2
subject = vertex.get_edges()
assert subject == solution
### euclidean_distance ###
vertex_a = Vertex('a')
vertex_b = Vertex('b', 3, 4)
subject = vertex_a.euclidean_distance(vertex_b)
assert subject == 5
subject = vertex_b.euclidean_distance(vertex_a)
assert subject == 5
