}

        this.localPid = (int) (Math.random() * 65536d);
        this.localTimeZone = TimeZone.getDefault();
        this.random = new SecureRandom();

        if (this.machineId == null) {
            final byte[] mid = new byte[32];
            this.random.nextBytes(mid);
            this.machineId = mid;
        }

import org.junit.jupiter.api.AfterEach
import org.junit.jupiter.api.Test

class WebSocketReaderTest {
  private val data = Buffer()
  private val callback = WebSocketRecorder("client")
  private val random = Random(0)

  // Mutually exclusive. Use the one corresponding to the peer whose behavior you wish to test.
  private val serverReader =
    WebSocketReader(
      isClient = false,
      source = data,

#### A Random Item { #a-random-item }

With `data.items()` we get an <abbr title="Something we can iterate on with a for loop, like a list, set, etc.">iterable object</abbr> with tuples containing the key and value for each dictionary item.

We convert this iterable object into a proper `list` with `list(data.items())`.

class RealWebSocket(
  taskRunner: TaskRunner,
  /** The application's original request unadulterated by web socket headers. */
  private val originalRequest: Request,
  internal val listener: WebSocketListener,
  private val random: Random,
  private val pingIntervalMillis: Long,
  /**
   * For clients this is initially null, and will be assigned to the agreed-upon extensions. For
   * servers, it should be the agreed-upon extensions immediately.
   */

      // access some of the elements
      Random random = new Random();
      List<ReferenceEntry<Object, Object>> reads = new ArrayList<>();
      Iterator<ReferenceEntry<Object, Object>> i = readOrder.iterator();
      while (i.hasNext()) {
        ReferenceEntry<Object, Object> entry = i.next();
        if (random.nextBoolean()) {
          map.get(entry.getKey(), loader);
          reads.add(entry);

            int[] hashAlgos = new int[20];
            byte[] salt = new byte[64];
            SecureRandom random = new SecureRandom();

            for (int i = 0; i < hashAlgos.length; i++) {
                hashAlgos[i] = random.nextInt(65536);
            }
            random.nextBytes(salt);

		t.Fatal(err)
	}
	if n != length {
		t.Errorf("erasureCreateFile returned %d, expected %d", n, length)
	}

	// To generate random offset/length.
	r := rand.New(rand.NewSource(UTCNow().UnixNano()))

	buf := &bytes.Buffer{}

	// Verify erasure.Decode() for random offsets and lengths.
	for range iterations {
		offset := r.Int63n(length)
		readLen := r.Int63n(length - offset)

The `EventListener.Factory` also makes it possible to limit metrics to a subset of calls. This one captures metrics on a random 10%:

```java
class MetricsEventListener extends EventListener {
  private static final Factory FACTORY = new Factory() {
    @Override public EventListener create(Call call) {
      if (Math.random() < 0.10) {
        return new MetricsEventListener(call);
      } else {
        return EventListener.NONE;

import java.util.Arrays;

import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;

@DisplayName("Smb2LeaseKey Tests")
class Smb2LeaseKeyTest {

    @Test
    @DisplayName("Should generate random lease key with correct size")
    void testRandomLeaseKeyGeneration() {
        Smb2LeaseKey key = new Smb2LeaseKey();

        assertNotNull(key.getKey());
        assertEquals(16, key.getKey().length);

            // Then
            assertNotNull(ra1, "Random access with mode should not be null");
            assertNotNull(ra2, "Random access with sharing should not be null");
            assertSame(mockRandomAccess, ra1, "Should return expected random access");
            assertSame(mockRandomAccess, ra2, "Should return expected random access");
        }
    }

    @Nested