// and the approximate actual delay, to be robust to variance in thread scheduling.
    char overWaitNanosFirstDigit =
        Long.toString(thread.timeSpentBlocked - MILLISECONDS.toNanos(longWait ? 5000 : 3000))
            .charAt(0);
    if (overWaitNanosFirstDigit < '4') {
      overWaitNanosFirstDigit = '9';
    }
    String nanosRegex = "[4-" + overWaitNanosFirstDigit + "][0-9]+";

    // and the approximate actual delay, to be robust to variance in thread scheduling.
    char overWaitNanosFirstDigit =
        Long.toString(thread.timeSpentBlocked - MILLISECONDS.toNanos(longWait ? 5000 : 3000))
            .charAt(0);
    if (overWaitNanosFirstDigit < '4') {
      overWaitNanosFirstDigit = '9';
    }
    String nanosRegex = "[4-" + overWaitNanosFirstDigit + "][0-9]+";

    connection.writePingAndAwaitPong()
    val elapsedNanos = System.nanoTime() - pingAtNanos
    assertThat(elapsedNanos).isGreaterThan(0L)
    assertThat(elapsedNanos).isLessThan(TimeUnit.SECONDS.toNanos(1))

    // Verify the peer received what was expected.
    val pingFrame = peer.takeFrame()
    assertThat(pingFrame.type).isEqualTo(Http2.TYPE_PING)
    assertThat(pingFrame.streamId).isEqualTo(0)