def test_get_vertex_by_id_negative2():
graph = Graph()
with pytest.raises(DataStructureIsEmptyException) as exception_info:
vertex = graph.get_vertex_by_id('A')
assert str(exception_info.value) == data_structure_is_empty_message()
def test_edges():
graph = Graph()
graph.create_vertex_by_id('A')
graph.create_vertex_by_id('B')
graph.create_vertex_by_id('C')
graph.add_edge('A', 'B', 10)
graph.add_edge('A', 'C', 20)
graph.add_edge('B', 'C', 20)
edges = graph.edges
assert len(edges) == 3
first = edges[0]
assert first.first.identifier == 'A'
assert first.second.identifier == 'B'
assert first.weight == 10
second = edges[1]
assert second.first.identifier == 'A'
assert second.second.identifier == 'C'
assert second.weight == 20
third = edges[2]
assert third.first.identifier == 'B'
assert third.second.identifier == 'C'
assert third.weight == 20
def test_bfs_positive1():
graph = Graph()
graph.create_vertex_by_id('A')
distance = bfs(graph, graph.get_vertex_by_id('A'))
assert distance['A'] == 0
def test_topological_sort3(sort):
graph = Graph()
graph.create_vertex_by_id('A')
result = sort(graph)
assert result[0].identifier == 'A'
def test_get_vertex_by_id_negative1():
graph = Graph()
graph.create_vertex_by_id('B')
with pytest.raises(NotContainsElementException) as exception_info:
vertex = graph.get_vertex_by_id('A')
assert str(exception_info.value) == not_contains_vertex_message('A')
def test_dijkstra_negative2(f):
graph = Graph()
graph.create_vertex_by_id('A')
with pytest.raises(NotContainsElementException) as exception_info:
f(graph, Vertex('B'))
assert str(exception_info.value) == not_contains_vertex_message('B')
def test_all_vertex_visited_dfs_recursion1():
graph = Graph()
graph.create_vertex_by_id('A')
graph.create_vertex_by_id('B')
graph.create_vertex_by_id('C')
graph.add_edge('A', 'B')
graph.add_edge('A', 'C')
graph.add_edge('C', 'C')
visited = dfs_recursion(graph, pre_visit, post_visit)
assert all(value == True for value in visited.values())
def test_dijkstra_negative1(f):
graph = Graph()
with pytest.raises(DataStructureIsEmptyException) as exception_info:
f(graph, Vertex('A'))
assert str(exception_info.value) == data_structure_is_empty_message()
def test_kruskal3():
graph = Graph()
graph.create_vertex_by_id('A')
graph.create_vertex_by_id('B')
graph.create_vertex_by_id('C')
graph.add_edge('A', 'C', 5)
graph.add_edge('B', 'C', 2)
graph.add_edge('C', 'A', 5)
graph.add_edge('C', 'B', 2)
edges = kruskal(graph)
assert len(edges) == 2
assert find_edge('A', 'C', edges)
assert find_edge('B', 'C', edges)
def test_all_vertex_visited_dfs_iterative2():
graph = Graph()
graph.create_vertex_by_id('A')
graph.create_vertex_by_id('B')
graph.create_vertex_by_id('C')
graph.create_vertex_by_id('D')
graph.create_vertex_by_id('E')
visited = dfs_iterative(graph)
assert all(value == True for value in visited.values())
def test_vertex_not_found2():
graph = Graph()
graph.create_vertex_by_id('B')
with pytest.raises(NotContainsElementException) as exception_info:
graph.add_edge('A', 'B')
assert str(exception_info.value) == not_contains_vertex_message('A')
def test_bfs_positive2():
graph = Graph()
graph.create_vertex_by_id('A')
graph.create_vertex_by_id('B')
graph.create_vertex_by_id('C')
graph.create_vertex_by_id('D')
graph.add_edge('A', 'B')
graph.add_edge('A', 'C')
distance = bfs(graph, graph.get_vertex_by_id('A'))
assert distance['A'] == 0
assert distance['B'] == 1
assert distance['C'] == 1
assert distance['D'] is None
def test_one_component():
graph = Graph()
graph.create_vertex_by_id('A')
graph.create_vertex_by_id('B')
graph.create_vertex_by_id('C')
graph.add_edge('A', 'B')
graph.add_edge('B', 'C')
components = connected_components(graph)
assert components['A'] == 1
assert components['B'] == 1
assert components['C'] == 1
def test_add_vertex_second_time():
graph = Graph()
graph.create_vertex_by_id('A')
with pytest.raises(GraphContainsVertexExemption) as exception_info:
graph.create_vertex_by_id('A')
assert str(exception_info.value) == graph_contains_vertex_message('A')
def test_contains_negative():
graph = Graph()
graph.create_vertex_by_id('K')
graph.create_vertex_by_id('L')
graph.create_vertex_by_id('M')
assert False is ('F' in graph)
def test_contains_positive():
graph = Graph()
graph.create_vertex_by_id('K')
graph.create_vertex_by_id('L')
graph.create_vertex_by_id('M')
assert True is ('L' in graph)
def test_get_vertex_by_id_positive():
graph = Graph()
graph.create_vertex_by_id('A')
graph.create_vertex_by_id('B')
graph.create_vertex_by_id('C')
length = len(graph)
vertex = graph.get_vertex_by_id('A')
assert vertex.identifier == 'A'
assert length == len(graph)
def test_get_graph_iterator():
graph = Graph()
graph.create_vertex_by_id('A')
graph.create_vertex_by_id('B')
graph.create_vertex_by_id('C')
for vertex in graph:
pass
def test_add_vertices():
graph = Graph()
graph.create_vertex_by_id('A')
graph.create_vertex_by_id('B')
graph.create_vertex_by_id('C')
assert graph.size == 3
assert len(graph) == 3
assert graph.is_empty == False
def test_four_component():
graph = Graph()
graph.create_vertex_by_id('A')
graph.create_vertex_by_id('B')
graph.create_vertex_by_id('C')
graph.create_vertex_by_id('D')
components = connected_components(graph)
assert components['A'] == 1
assert components['B'] == 2
assert components['C'] == 3
assert components['D'] == 4
def test_sorted_edges():
graph = Graph()
graph.create_vertex_by_id('A')
graph.create_vertex_by_id('B')
graph.create_vertex_by_id('C')
graph.add_edge('A', 'B', 15)
graph.add_edge('A', 'C', 10)
graph.add_edge('B', 'C', 20)
edges = graph.get_sorted_edges_by(lambda edge: edge.weight)
first = edges[0]
assert first.weight == 10
second = edges[1]
assert second.weight == 15
third = edges[2]
assert third.weight == 20
def test_dijkstra_positive2(f):
graph = Graph()
graph.create_vertex_by_id('A')
graph.create_vertex_by_id('B')
graph.create_vertex_by_id('C')
graph.create_vertex_by_id('D')
graph.add_edge('A', 'C', 2)
graph.add_edge('A', 'B', 4)
distance = f(graph, graph.get_vertex_by_id('A'))
distance_to_b = get_distance(graph.get_vertex_by_id('B'), distance)
assert distance_to_b == 4
distance_to_c = get_distance(graph.get_vertex_by_id('C'), distance)
assert distance_to_c == 2
distance_to_d = get_distance(graph.get_vertex_by_id('D'), distance)
assert distance_to_d is None
def test_positive1(f):
graph = Graph()
graph.create_vertex_by_id('A')
graph.create_vertex_by_id('B')
graph.create_vertex_by_id('C')
graph.create_vertex_by_id('D')
graph.create_vertex_by_id('E')
graph.add_edge('A', 'C', 2)
graph.add_edge('A', 'B', 4)
graph.add_edge('B', 'C', 3)
graph.add_edge('B', 'D', 2)
graph.add_edge('B', 'E', 3)
graph.add_edge('C', 'B', 1)
graph.add_edge('C', 'D', 4)
graph.add_edge('C', 'E', 5)
graph.add_edge('E', 'D', 1)
distance = f(graph, graph.get_vertex_by_id('A'))
distance_to_c = get_distance(graph.get_vertex_by_id('C'), distance)
assert distance_to_c == 2
distance_to_b = get_distance(graph.get_vertex_by_id('B'), distance)
assert distance_to_b == 3
distance_to_e = get_distance(graph.get_vertex_by_id('E'), distance)
assert distance_to_e == 6
distance_to_d = get_distance(graph.get_vertex_by_id('D'), distance)
assert distance_to_d == 5
def test_kruskal1():
graph = Graph()
graph.create_vertex_by_id('A')
graph.create_vertex_by_id('B')
graph.create_vertex_by_id('C')
graph.create_vertex_by_id('D')
graph.create_vertex_by_id('E')
graph.create_vertex_by_id('F')
graph.add_edge('A', 'B', 2)
graph.add_edge('A', 'C', 1)
graph.add_edge('B', 'A', 2)
graph.add_edge('B', 'C', 2)
graph.add_edge('B', 'D', 1)
graph.add_edge('D', 'C', 2)
graph.add_edge('D', 'E', 3)
graph.add_edge('D', 'F', 4)
graph.add_edge('C', 'D', 2)
graph.add_edge('C', 'E', 3)
graph.add_edge('C', 'A', 1)
graph.add_edge('C', 'B', 2)
graph.add_edge('E', 'D', 3)
graph.add_edge('E', 'C', 3)
graph.add_edge('E', 'F', 2)
graph.add_edge('F', 'E', 2)
graph.add_edge('F', 'D', 4)
edges = kruskal(graph)
assert len(edges) == 5
assert find_edge('A', 'B', edges) is not None
assert find_edge('A', 'C', edges) is not None
assert find_edge('B', 'D', edges) is not None
assert find_edge('D', 'E', edges) is not None
assert find_edge('E', 'F', edges) is not None
def test_all_vertex_visited_dfs_iterative1():
graph = Graph()
graph.create_vertex_by_id('A')
graph.create_vertex_by_id('B')
graph.create_vertex_by_id('C')
graph.create_vertex_by_id('D')
graph.create_vertex_by_id('E')
# first component of connectivity
graph.add_edge('A', 'B')
graph.add_edge('B', 'C')
graph.add_edge('C', 'A')
# second component of connectivity
graph.add_edge('D', 'E')
# third component of connectivity
graph.create_vertex_by_id('K')
visited = dfs_iterative(graph)
assert all(value == True for value in visited.values())
def test_kruskal2():
graph = Graph()
edges = kruskal(graph)
assert len(edges) == 0
def test_topological_sort2():
graph = Graph()
graph.create_vertex_by_id('A')
graph.create_vertex_by_id('B')
graph.create_vertex_by_id('C')
graph.create_vertex_by_id('G')
graph.create_vertex_by_id('D')
graph.create_vertex_by_id('E')
graph.add_edge('A', 'B')
graph.add_edge('A', 'G')
graph.add_edge('B', 'C')
graph.add_edge('C', 'D')
graph.add_edge('B', 'D')
graph.add_edge('G', 'D')
graph.add_edge('D', 'E')
result = topological_sort(graph)
assert result[0].identifier == 'A'
assert result[1].identifier == 'B'
assert result[2].identifier == 'G'
assert result[3].identifier == 'C'
assert result[4].identifier == 'D'
assert result[5].identifier == 'E'
def test_make_graph():
graph = Graph()
assert graph.size == 0
assert graph.is_empty == True
assert len(graph) == 0
def test_add_edge_in_empty_graph():
graph = Graph()
with pytest.raises(DataStructureIsEmptyException) as exception_info:
graph.add_edge('A', 'B')
assert str(exception_info.value) == data_structure_is_empty_message()