val socket = Socket()
    socket.connect(serverSocket.localSocketAddress)
    val socketSource = socket.source().buffer()

    assertThat(socket.isHealthy(socketSource)).isTrue()

    serverSocket.close()
    assertThat(socket.isHealthy(socketSource)).isFalse()
  }

  @Test
  fun testDurationTimeUnit() {
    assertThat(checkDuration("timeout", 0, TimeUnit.MILLISECONDS)).isEqualTo(0)

        assertFalse(channelInfo.isHealthy());

        channelInfo.setState(ChannelState.ESTABLISHED);
        assertEquals(ChannelState.ESTABLISHED, channelInfo.getState());
        assertTrue(channelInfo.isHealthy());

        channelInfo.setState(ChannelState.ACTIVE);
        assertTrue(channelInfo.isHealthy());

        channelInfo.setState(ChannelState.FAILED);

        assertEquals(localNic, channel.getLocalInterface());
        assertEquals(remoteNic, channel.getRemoteInterface());
        assertEquals(ChannelState.ESTABLISHED, channel.getState());
        assertTrue(channel.isHealthy());

        // Test metrics
        channel.incrementRequestsSent();
        channel.addBytesSent(1024);
        channel.updateActivity();

        assertEquals(1, channel.getRequestsSent());

    val candidate = call.connection ?: return null

    // Make sure this connection is healthy & eligible for new exchanges. If it's no longer needed
    // then we're on the hook to close it.
    val healthy = candidate.isHealthy(doExtensiveHealthChecks)
    var noNewExchangesEvent = false
    val toClose: Socket? =
      candidate.withLock {
        when {
          !healthy -> {
            noNewExchangesEvent = !candidate.noNewExchanges

 * attempting to read with a short timeout. If the fails immediately we know the socket is
 * unhealthy.
 *
 * @param source the source used to read bytes from the socket.
 */
internal fun Socket.isHealthy(source: BufferedSource): Boolean =
  try {
    val readTimeout = soTimeout
    try {
      soTimeout = 1
      !source.exhausted()
    } finally {
      soTimeout = readTimeout
    }

              true
            }
          }
        }
      if (!acquired) continue

      // Confirm the connection is healthy and return it.
      if (connection.isHealthy(doExtensiveHealthChecks)) return connection

      // In the second synchronized block, release the unhealthy acquired connection. We're also on
      // the hook to close this connection if it's no longer in use.

    // When the timeout is sent the connection doesn't immediately go unhealthy.
    assertThat(connection.isHealthy(System.nanoTime())).isTrue()

    // But if the ping doesn't arrive, the connection goes unhealthy.
    Thread.sleep(TimeUnit.NANOSECONDS.toMillis(Http2Connection.DEGRADED_PONG_TIMEOUT_NS.toLong()))
    assertThat(connection.isHealthy(System.nanoTime())).isFalse()

    // When a pong does arrive, the connection becomes healthy again.

HSPLokhttp3/internal/connection/RealConnection;->isEligible$okhttp(Lokhttp3/Address;Ljava/util/List;)Z
HSPLokhttp3/internal/connection/RealConnection;->isHealthy(Z)Z
HSPLokhttp3/internal/connection/RealConnection;->isMultiplexed$okhttp()Z
HSPLokhttp3/internal/connection/RealConnection;->onSettings(Lokhttp3/internal/http2/Http2Connection;Lokhttp3/internal/http2/Settings;)V