def test_deapth_first_empty_graph():
graph = Graph()
banana = Vertex("banana")
with pytest.raises(ValueError):
vertices_lst = graph.depth_first(banana)
def test_nodes_retrived():
graph=Graph()
graph.add_node('a')
graph.add_node('b')
actual = graph.get_nodes()
expected = {'a': [],'b': []}
assert expected == actual
def test_breadth_first_one_element():
graph = Graph()
banana = graph.add_node('banana')
vertices_lst = graph.breadth_first(banana)
assert vertices_lst == [banana]
def test_add_node():
graph = Graph()
actual = graph.add_node('hello').value
assert actual == 'hello'
def test_size():
graph = Graph()
graph.add_node('a')
graph.add_node('b')
actual = graph.size()
expected = 2
assert expected == actual
def test_helper2_no_neighbors():
graph = Graph()
a = graph.add_node("a")
neighbors_dict = helper2(graph.get_neighbors(a))
assert neighbors_dict == {}
def test_size_empty():
graph = Graph()
expected = 0
actual = graph.size()
assert actual == expected
def test_add_edge_start():
graph = Graph()
start = Node('start')
end = graph.add_node('end')
actual = graph.add_edge(start, end)
assert actual == 'Start node is not exist in Graph'
def test_add_edge_end():
graph = Graph()
end = Node('end')
start = graph.add_node('start')
actual = graph.add_edge(start, end)
assert actual == 'End node is not exist in Graph'
def test_get_neighbors_no_neighbors():
graph = Graph()
banana = graph.add_node('banana')
neighbors = graph.get_neighbors(banana)
assert len(neighbors) == 0
assert neighbors == []
def test_edge_end_node_not_in_graph():
graph = Graph()
end = Vertex('end')
start = graph.add_node('start')
with pytest.raises(KeyError):
graph.add_edge(start, end)
def test_get_nodes():
graph = Graph()
hi = graph.add_node('hi')
hello = graph.add_node('hello')
actual = len(graph.get_nodes())
assert actual == 2
def test_size():
graph = Graph()
graph.add_node('hello')
expected = 1
actual = graph.size()
assert actual == expected
def test_breadth_first_regular2():
graph = Graph()
banana = graph.add_node('banana')
apple = graph.add_node('apple')
strawberry = graph.add_node('strawberry')
graph.add_edge(banana, apple)
graph.add_edge(strawberry, banana)
vertices_lst = graph.breadth_first(strawberry)
assert vertices_lst == [strawberry, banana, apple]
def test_add_edge():
graph = Graph()
end = graph.add_node('banana')
start = graph.add_node('apple')
graph.add_edge(start, end)
assert graph._adjacency_list[start][0] == (end, 0)
assert graph.get_neighbors(start) == [(end, 0)]
graph.add_edge(end, start)
assert graph.get_neighbors(end) == [(start, 0)]
def test_add_edge_with_weight():
graph = Graph()
end = graph.add_node('banana')
start = graph.add_node('apple')
graph.add_edge(start, end, 44)
assert graph.get_neighbors(start) == [(end, 44)]
graph.add_edge(end, start, 23)
assert graph.get_neighbors(end) == [(start, 23)]
def test_add_edge_with_weight_letters():
graph = Graph()
end = graph.add_node('dog')
start = graph.add_node('cat')
graph.add_edge(start, end, "a")
assert graph.get_neighbors(start) == [(end, "a")]
graph.add_edge(end, start, "b")
assert graph.get_neighbors(end) == [(start, "b")]
def test_breadth_first_different_start_node():
graph = Graph()
banana = graph.add_node('banana')
apple = graph.add_node('apple')
strawberry = graph.add_node('strawberry')
graph.add_edge(banana, apple)
graph.add_edge(strawberry, banana)
vertices_lst = graph.breadth_first(banana)
assert vertices_lst == [banana, apple]
def test_get_nodes():
gr = Graph()
gr.add_node('1')
gr.add_node('2')
gr.add_node('3')
assert len(gr.get_nodes()) == 3
def test_one_node():
graph = Graph()
graph.add_node('node1')
graph.add_edge('node1','node1')
actual = graph.get_neighbors('node1')
expected = 'node1 :edge--> node1 ... weight: 1'
assert expected == actual
def test_size():
graph = Graph()
graph.add_node('apple')
assert graph.size() == 1
graph.add_node('banana')
assert graph.size() == 2
def test_collection_of_nodes_properly_retrived():
g = Graph()
g.add_node('a')
g.add_node('b')
g.add_node('c')
actual = g.get_nodes()
expected = {'a': [], 'b': [], 'c': []}
assert expected == actual
def test_one_node_one_edge():
g = Graph()
g.add_node('a')
g.add_edge('a', 'a')
actual = g.get_neighbors('a')
expected = 'a --> a edge weight: 1'
assert expected == actual
def test_get_neighbors():
gr = Graph()
start = gr.add_node('start')
end = gr.add_node('end')
gr.add_edge(start, end, 4)
neighbors = gr.get_neighbors(start)
assert neighbors[0][0].value == 'end'
assert neighbors[0][1] == 4
def test_edge():
graph=Graph()
graph.add_node('a')
graph.add_node('b')
graph.add_edge('a', 'b', 8)
actual = graph.get_neighbors('a')
expected = 'a :edge--> b ... weight: 8'
assert actual == expected
def test_edge_added_to_graph():
g = Graph()
g.add_node('a')
g.add_node('b')
g.add_edge('a', 'b', 1)
actual = g.get_neighbors('a')
expected = 'a --> b edge weight: 1'
assert actual == expected
def test_breadth_first_regular():
graph = Graph()
banana = graph.add_node('banana')
vertices_lst = graph.breadth_first(banana)
apple = graph.add_node('apple')
graph.add_edge(banana, apple)
vertices_lst = graph.breadth_first(banana)
assert vertices_lst == [banana, apple]
def test_proper_size_is_returned():
g = Graph()
g.add_node('a')
g.add_node('b')
g.add_node('c')
g.add_node('d')
actual = g.size()
expected = 4
assert expected == actual
def test_add_edge():
gr = Graph()
start = gr.add_node('start')
end = gr.add_node('end')
gr.add_edge(start, end)
assert gr.adjacency_list[start][0] == (end, 1)
def test_breadth_firts_islands_nodes():
graph = Graph()
banana = graph.add_node('banana')
apple = graph.add_node('apple')
strawberry = graph.add_node('strawberry')
graph.add_edge(banana, apple)
vertices_lst = graph.breadth_first(banana)
assert vertices_lst == [banana, apple]
vertices_lst = graph.breadth_first(apple)
assert vertices_lst == [apple]