How to use pytest session fixture return value in a test class

Question

I am creating automation framework where in few parameters I have kept in a separate JSON file. I have written the below fixture which would load the data from the JSON file in conftest.py.

import json

@pytest.fixture(scope='session')
def get_config_values():
    with open('./Resources/config.json') as f:
        config_values = json.load(f)
    return config_values

I have kept the scope as session so that I do not need to load them for every test class. I am intending to use this return value in all the test classes which are in the below way

@pytest.mark.usefixtures("get_config_values")
class TestConf:

    def test_conf_test1(self):
        print(f"Test for user a")
        print(self.config_values["a"])

    def test_conf_test2(self):
        print(f"Test for user b")
        print(self.config_values["b"])

I am unable to use the return value in the the tests. I have tried below ways-

print(self.config_values["b"])
print(get_config_values["b"])

Please can someone help me how can we use session fixture return values in tests. Or if there is any better way to achieve this.

Answer 1

If I'm not mistaken, usefixtures can't be used in this way, that is to return values to each of your test methods. You'd use this for like cleanup tasks like in the example here.

For what you're asking about, you'd need your fixture as a parameter:

class TestConf:

    def test_conf_test1(self, get_config_values):
        print(f"Test for user a")
        print(get_config_values["a"])

    def test_conf_test2(self, get_config_values):
        print(f"Test for user b")
        print(get_config_values["b"])