def METHOD_NAME(self):
    emr_client = mock.MagicMock
    emr_client.clusters = {}
    with mock.patch(
        "prowler.providers.aws.services.emr.emr_service.EMR",
        new=emr_client,
    ):
        # Test Check
        from prowler.providers.aws.services.emr.emr_cluster_master_nodes_no_public_ip.emr_cluster_master_nodes_no_public_ip import (
            emr_cluster_master_nodes_no_public_ip,
        )
        check = emr_cluster_master_nodes_no_public_ip()
        result = check.execute()
        assert len(result) == 0