code: def testConcurrencyGroupSmokeTest(self):
      with tempfile.TemporaryDirectory() as tmpdir:
          cluster_config_full = {
              "head_node_type": {
                  "instance_type": "n1-standard-16"  # 16 CPUs, 0 GPUs
              },
              "worker_node_types": [
                  {
                      "instance_type": "random-str-xxx-32",  # 32 CPUS, 0 GPUs
                      "max_workers": 10,
                  },
              ],
          }
  
          cluster_config_smoke = {
              "head_node_type": {
                  "instance_type": "n1-standard-16"  # 16 CPUs, 0 GPUs
              },
              "worker_node_types": [
                  {
                      "instance_type": "random-str-xxx-32",  # 32 CPUS, 0 GPUs
                      "max_workers": 1,
                  },
              ],
          }
  
          cluster_config_full_path = os.path.join(tmpdir, "full.yaml")
          with open(cluster_config_full_path, "w") as fp:
              yaml.safe_dump(cluster_config_full, fp)
  
          cluster_config_smoke_path = os.path.join(tmpdir, "smoke.yaml")
          with open(cluster_config_smoke_path, "w") as fp:
              yaml.safe_dump(cluster_config_smoke, fp)
  
          test = MockTest(
              {
                  "name": "test_1",
                  "cluster": {
                      "cluster_compute": cluster_config_full_path
                  },
                  "smoke_test": {
                      "cluster": {
                          "cluster_compute": cluster_config_smoke_path
                      },
                  },
              }
          )
          step = get_step(test, smoke_test=False)
          self.assertEquals(step["concurrency_group"], "medium")
  
          step = get_step(test, smoke_test=True)
          self.assertEquals(step["concurrency_group"], "small")
  
imports: import os
  import sys
  import tempfile
  import unittest
  from typing import Dict, Callable
  from unittest.mock import patch
  import yaml
  from github import Repository
  from ray_release.buildkite.concurrency import get_test_resources_from_cluster_compute, get_concurrency_group
  from ray_release.buildkite.filter import filter_tests, group_tests
  from ray_release.buildkite.settings import split_ray_repo_str, get_default_settings, update_settings_from_environment, Frequency, update_settings_from_buildkite, Priority, get_test_attr_regex_filters
  from ray_release.buildkite.step import get_step, RELEASE_QUEUE_DEFAULT, RELEASE_QUEUE_CLIENT, DOCKER_PLUGIN_KEY
  from ray_release.test import Test
  from ray_release.exception import ReleaseTestConfigError
  from ray_release.wheels import DEFAULT_BRANCH
label_desc: Use image node_id 12 for calling the BuildkiteSettingsTest obj's underlying member method code with example usage: obj.testConcurrencyGroupSmokeTest() without return types