def test_not_last_constraint_set():
r = RankingProblem()
r.set_items(["Dog"])
r.not_last("Dog")
assert (r._constraints[1][1] == ("Dog", LAST))
assert (r._constraints[1][0]._func.__name__ == "not_equal")
def test_ranking_problem_solve_not_last_correct():
r = RankingProblem()
r.set_items({"Blue", "Red", "Green", "Yellow", "Blue", "Purple"})
r.not_last("Purple")
actual_results = r.solve()
for actual_result in actual_results:
assert (actual_result[-1] != "Purple")
def test_ranking_problem_solve_not_last_in_pair_correct():
expected_results = [
(
"Red",
"Blue",
),
]
r = RankingProblem()
r.set_items({"Blue", "Red"})
r.not_last("Red")
actual_results = r.solve()
assert (actual_results == expected_results)
def test_not_last_fails_unknown_item():
r = RankingProblem()
with pytest.raises(ValueError, match="Dog not in Items"):
r.not_last("Dog")
def test_can_call_not_last():
r = RankingProblem()
r.set_items(["Dog"])
r.not_last("Dog")