return null;
        }).when(smbTree).close();

        smbTree.close();

        verify(smbTree).close();
    }

    /**
     * Test for unwrap preserving type safety.
     * Verifies that unwrap maintains type safety at compile time.
     */
    @Test
    void testUnwrap_typeSafety() {
        CustomSmbTree customTree = mock(CustomSmbTree.class);

## Important Notes for AI Assistants

1. **Resource Management**: Always use try-with-resources with `CurlResponse`.

2. **Null Safety**: Constructors validate null arguments. Follow this pattern.

3. **Thread Safety**: `RequestProcessor` is single-use per request.

4. **Encoding**: Call `encoding()` before `param()` methods.

    protected static final String JAVABIN = "javabin";

    /** Constant for Kryo serializer type. */
    protected static final String KRYO = "kryo";

    /** ThreadLocal container for Kryo instances to ensure thread safety. */
    protected final ThreadLocal<Kryo> kryoThreadLocal;

    /**
     * Constructs a new DataSerializer.
     * <p>
     * Initializes the ThreadLocal Kryo instances with appropriate configuration.

If one or more drives are offline at the start of a PutObject or NewMultipartUpload operation the object will have additional data
protection bits added automatically to provide the regular safety for these objects up to 50% of the number of drives.
This will allow normal write operations to take place on systems that exceed the write tolerance.

                        java.lang.reflect.Modifier.isStatic(method.getModifiers()));
            }
        }
    }

    @Test
    public void test_generic_type_safety() {
        // Test generic type safety of getObject method
        // Since we're in test environment without request context, this will return null
        String stringResult = WebApiUtil.getObject("testString");

import org.codelibs.fess.unit.UnitFessTestCase;
import org.dbflute.optional.OptionalThing;
import org.junit.jupiter.api.Test;

/**
 * Concurrency and thread-safety tests for RankFusionProcessor.
 * Tests the improvements made to thread safety using CopyOnWriteArrayList.
 */
public class RankFusionProcessorConcurrencyTest extends UnitFessTestCase {

    private static final String ID_FIELD = "_id";

    /**

 * <p>
 * <strong>Thread-Safety:</strong> This class is <strong>NOT thread-safe</strong>.
 * It extends {@link LinkedHashMap} without synchronization. If multiple threads access
 * an instance concurrently, and at least one thread modifies the map structurally,
 * it must be synchronized externally.
 * </p>
 * <p>
 * For thread-safe usage, wrap with {@link java.util.Collections#synchronizedMap(Map)}:
 * </p>

    Set<E> result = super.convertToHashFloodingResistantImplementation();
    this.predecessor = null;
    this.successor = null;
    return result;
  }

  /*
   * For discussion of the safety of the following methods for operating on predecessors and
   * successors, see the comments near the end of CompactHashMap, noting that the methods here call

    Set<E> result = super.convertToHashFloodingResistantImplementation();
    this.predecessor = null;
    this.successor = null;
    return result;
  }

  /*
   * For discussion of the safety of the following methods for operating on predecessors and
   * successors, see the comments near the end of CompactHashMap, noting that the methods here call

  Map<K, V> convertToHashFloodingResistantImplementation() {
    Map<K, V> result = super.convertToHashFloodingResistantImplementation();
    links = null;
    return result;
  }

  /*
   * For discussion of the safety of the following methods for operating on predecessors and
   * successors, see the comments near the end of CompactHashMap, noting that the methods here call
   * link(), which is defined at the end of this file.
   */