filtered.put("a", 2);
    filtered.put("b", 4);
    assertEquals(ImmutableMap.of("a", 2, "b", 4), filtered);

    Entry<String, Integer> entry = filtered.entrySet().iterator().next();
    assertThrows(IllegalArgumentException.class, () -> entry.setValue(5));

    assertEquals(ImmutableMap.of("a", 2, "b", 4), filtered);
  }

  public void testFilteredValuesClear() {

## Esperar mensajes y enviar mensajes

En tu ruta de WebSocket puedes `await` para recibir mensajes y enviar mensajes.

{* ../../docs_src/websockets/tutorial001.py hl[48:52] *}

Puedes recibir y enviar datos binarios, de texto y JSON.

## Pruébalo

Si tu archivo se llama `main.py`, ejecuta tu aplicación con:

<div class="termy">

```console
$ fastapi dev main.py

    this.replacementsLength = replacements.length;
    if (safeMax < safeMin) {
      // If the safe range is empty, set the range limits to opposite extremes
      // to ensure the first test of either value will (almost certainly) fail.
      safeMax = Character.MIN_VALUE;
      safeMin = Character.MAX_VALUE;
    }
    this.safeMin = safeMin;
    this.safeMax = safeMax;
  }

  /*

   * ...
   * synchronized (queue) {  // Must synchronize on queue!
   *   Iterator<E> i = queue.iterator(); // Must be in synchronized block
   *   while (i.hasNext()) {
   *     foo(i.next());
   *   }
   * }
   * }
   *
   * <p>Failure to follow this advice may result in non-deterministic behavior.
   *
   * <p>The returned queue will be serializable if the specified queue is serializable.

import org.codelibs.fess.mylasta.direction.FessConfig;
import org.codelibs.fess.query.parser.QueryParser;
import org.codelibs.fess.unit.UnitFessTestCase;
import org.codelibs.fess.util.ComponentUtil;

/**
 * Base test class for query-related tests that properly initializes FessConfig
 */
public abstract class QueryTestBase extends UnitFessTestCase {

    protected QueryProcessor queryProcessor;

    @Override

          if (labels[currentLabelIndex].size == currentLabelByteIndex) {
            // We've exhausted our current label. Either there are more labels to compare, in which
            // case we expect a dot as the next character. Otherwise, we've checked all our labels.
            if (currentLabelIndex == labels.size - 1) {
              break
            } else {
              currentLabelIndex++

    return new AbstractSequentialIterator<C>(first()) {
      final C last = last();

      @Override
      protected @Nullable C computeNext(C previous) {
        return equalsOrThrow(previous, last) ? null : domain.next(previous);
      }
    };
  }

  @GwtIncompatible // NavigableSet
  @Override
  public UnmodifiableIterator<C> descendingIterator() {
    return new AbstractSequentialIterator<C>(last()) {

import com.google.common.testing.NullPointerTester;
import com.google.common.testing.SerializableTester;
import junit.framework.TestCase;
import org.jspecify.annotations.NullUnmarked;

/**
 * Unit test for {@link CaseFormat}.
 *
 * @author Mike Bostock
 */
@GwtCompatible
@NullUnmarked
public class CaseFormatTest extends TestCase {

  public void testIdentity() {

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import junit.framework.TestCase;
import org.jspecify.annotations.NullMarked;
import org.jspecify.annotations.Nullable;

/**
 * Unit test for {@code ObjectArrays}.
 *
 * @author Kevin Bourrillion
 */
@GwtCompatible
@NullMarked
public class ObjectArraysTest extends TestCase {

  @J2ktIncompatible
  @GwtIncompatible // NullPointerTester

     * @param access the desired access rights
     * @param shareAccess the share access mode
     * @param extFileAttributes the extended file attributes
     * @param createOptions the create options
     * @param andx the next command in the chain
     */
    public SmbComNTCreateAndX(final Configuration config, final String name, final int flags, final int access, final int shareAccess,