______________ ERROR at setup of test_refresh_no_scopes[urllib3] _______________

service_account_file = '/tmpfs/src/github/google-auth-library-python/system_tests/system_tests_sync/../data/service_account.json'

    @pytest.fixture
    def credentials(service_account_file):
>       yield service_account.Credentials.from_service_account_file(service_account_file)

system_tests_sync/test_service_account.py:25:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.nox/service_account_sync-3-7/lib/python3.7/site-packages/google/oauth2/service_account.py:239: in from_service_account_file
    filename, require=["client_email", "token_uri"]
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

filename = '/tmpfs/src/github/google-auth-library-python/system_tests/system_tests_sync/../data/service_account.json'
require = ['client_email', 'token_uri']

    def from_filename(filename, require=None):
        """Reads a Google service account JSON file and returns its parsed info.

        Args:
            filename (str): The path to the service account .json file.
            require (Sequence[str]): List of keys required to be present in the
                info.

        Returns:
            Tuple[ Mapping[str, str], google.auth.crypt.Signer ]: The verified
                info and a signer instance.
        """
>       with io.open(filename, "r", encoding="utf-8") as json_file:
E       FileNotFoundError: [Errno 2] No such file or directory: '/tmpfs/src/github/google-auth-library-python/system_tests/system_tests_sync/../data/service_account.json'