def test_adjacent_returns_false_if_specific_pair_of_values_has_no_edge(num):
"""Test adjacent is false if pair of values given doesn't exist in graph as edge."""
from weight_graph import Graph
g = Graph()
for x in range(num):
g.add_edge(x, x + 1, x % 3 + 1)
for x in range(num - 1):
assert not g.adjacent(x, x + 2)
def test_adjacent_returns_true_if_specific_pair_of_values_given_exist(num):
"""Test adjacent is true if pair of values given exist in graph as edge."""
from weight_graph import Graph
g = Graph()
for x in range(num):
g.add_edge(x, x + 1, x % 3 + 1)
for x in range(num):
assert g.adjacent(x, x + 1)