code: package io.ray.test;
  
  import io.ray.api.PlacementGroups;
  import io.ray.api.options.PlacementGroupCreationOptions;
  import io.ray.api.placementgroup.PlacementGroup;
  import io.ray.api.placementgroup.PlacementStrategy;
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  /** A utils class for placement group test. */
  public class PlacementGroupTestUtils {
  
    public static PlacementGroup createNameSpecifiedSimpleGroup(
        String resourceName,
        int bundleSize,
        PlacementStrategy strategy,
        Double resourceSize,
        String groupName) {
      List<Map<String, Double>> bundles = new ArrayList<>();
  
      for (int i = 0; i < bundleSize; i++) {
        Map<String, Double> bundle = new HashMap<>();
        bundle.put(resourceName, resourceSize);
        bundles.add(bundle);
      }
      PlacementGroupCreationOptions.Builder builder =
          new PlacementGroupCreationOptions.Builder().setBundles(bundles).setStrategy(strategy);
      builder.setName(groupName);
  
      return PlacementGroups.createPlacementGroup(builder.build());
    }
  
    public static PlacementGroup createSpecifiedSimpleGroup(
        String resourceName,
        int bundleSize,
        PlacementStrategy strategy,
        Double resourceSize,
        boolean isGlobal) {
      return createNameSpecifiedSimpleGroup(
          resourceName, bundleSize, strategy, resourceSize, "unnamed_group");
    }
  
    public static PlacementGroup createSimpleGroup() {
      return createSpecifiedSimpleGroup("CPU", 1, PlacementStrategy.PACK, 1.0, false);
    }
  
    public static void createBundleSizeInvalidGroup() {
      createSpecifiedSimpleGroup("CPU", 0, PlacementStrategy.PACK, 1.0, false);
    }
  
    public static void createBundleResourceInvalidGroup() {
      createSpecifiedSimpleGroup("CPU", 1, PlacementStrategy.PACK, 0.0, false);
    }
  }
  