code: def test_worker_group_replicas(
      group_index, expected_max_replicas, expected_replicas
  ):
      """Basic unit test for _worker_group_max_replicas and _worker_group_replicas
  
      Uses a RayCluster CR with worker groups with 300 maxReplicas, 200 maxReplicas,
      and unspecified maxReplicas, in that order.
      """
      raycluster = get_basic_ray_cr()
  
      # Add a worker group without maxReplicas to confirm behavior
      # when maxReplicas is not specified.
      no_max_replicas_group = copy.deepcopy(
          raycluster["spec"]["workerGroupSpecs"][0]
      )
      no_max_replicas_group["groupName"] = "no-max-replicas"
      del no_max_replicas_group["maxReplicas"]
      # Also, replicas field, just for the sake of testing.
      no_max_replicas_group["replicas"] = 0
      raycluster["spec"]["workerGroupSpecs"].append(
          no_max_replicas_group
      )
  
      assert (
          _worker_group_max_replicas(raycluster, group_index)
          == expected_max_replicas
      )
      assert (
          _worker_group_replicas(raycluster, group_index)
          == expected_replicas
      )
  
imports: import copy
  import mock
  import sys
  import jsonpatch
  import pytest
  from ray.autoscaler.batching_node_provider import NodeData
  from ray.autoscaler._private.kuberay.node_provider import _worker_group_index, _worker_group_max_replicas, _worker_group_replicas, KubeRayNodeProvider, ScaleRequest
  from ray.autoscaler._private.util import NodeID
  from pathlib import Path
  import yaml
  from ray.tests.kuberay.test_autoscaling_config import get_basic_ray_cr
  from typing import Set, List
label_desc: Use image node_id 4 for calling a global function with example usage: test_worker_group_replicas(group_index, expected_max_replicas, expected_replicas) without return types