pytest: Run general test with dynamic input from files

Question

I'm currently trying to write a python test module with pytest which reads several different information from a bunch of files. These informations shall be used as inputs (fixtures) for 2 general tests. These 2 tests shall be run for each fixture (so for each file).

What I want are dynamic fixtures generated from the content of an undefined amount of text files (jsons).

Then I have two pytest "test_*" functions which are fed with this undefined amount of fixtures.

Is such a thing possible with pytest? I already tried the lib pytest-cases, but I were unable to achieve my desired solution.

That is my current code base, where I want the yield to return a "for each *.json" fixture:

from pytest_cases import parametrize_with_cases, get_case_id

class Foo:
    def matching_events(self):
        # - glob for *.json files
        # - read the rule files and events
        # generate the fixture objects and return them for each *.json file
        yield "test_rule_name", {}, {}

    def mismatching_events(self):
        # - glob for *.json files
        # - read the rule files and events
        # generate the fixture objects and return them for each *.json file
        yield "test_rule_name", {}, {}

def case_id_generator(case_fun):
    """Custom test case id"""
    return "#%s#" % case_fun

@parametrize_with_cases("rule_name, rule_definition, events", cases=Foo, prefix="matching_", ids=case_id_generator)
def test_rule_match(rule_name, rule_definition, events):
    assert isinstance(rule_name, str)
    assert isinstance(rule_definition, dict)
    assert isinstance(events, dict)
    # do some more things with the rule definition and evnets

@parametrize_with_cases("rule_name, rule_definition, events", cases=Foo, prefix="mismatching_", ids=case_id_generator)
def test_rule_mismatch(rule_name, rule_definition, events):
    assert isinstance(rule_name, str)
    assert isinstance(rule_definition, dict)
    assert isinstance(events, dict)
    # do some more things with the rule definition and evnets