pytest: Realizing all fixture permutations as a test's input

I have a test case that involves a rather large cartesian product(thousands of permutations) of a dictionary's keys/values. The function under test will spit out a list of MD5 sums each with a 1-1 correspondence to a given permutation.

Function under test:

 def get_all_perms():
     ... return big list of MD5 sums

I am trying to use pytest fixtures to generate the permutation space. As such I have a bunch of composed fixtures as follows:

@pytest.fixture(params=[True,False])
def build_pair_1(request):
    return ('KEY_1', request.param)

@pytest.fixture(params=[True,False])
def build_pair_2(request):
    return ('KEY_2', request.param)

@pytest.fixture(params=[True,False])
def build_pair_3(request):
    return ('KEY_3', request.param)

@pytest.fixture
def build_dict(build_pair_1, build_pair_2, build_pair_3)

    return dict([
            build_pair_1,
            build_pair_2,
            build_pair_3,
        ])

@pytest.fixture
def get_sums(build_dict):
    return sum(build_dict)

This does an excellent job of creating all the permutations. But if my understanding is correct and I add get_sums to a test as an argument I'll get a test execution per sum. What I need to do is take the resulting set of permutations from get_sums, stuff it into a list, and compare it to the result of my function under test. Something akin to...

def test_result_of_get_all_perms:
    result = get_all_perms()
    for sum in get_sums():
        assert sum in result

Is there a way to iterate of the result of a fixture?