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)

0385          ; disallowed_STD3_mapped ; 0020 0308 0301 #1.1  GREEK DIALYTIKA TONOS
0386          ; mapped                 ; 03AC          # 1.1  GREEK CAPITAL LETTER ALPHA WITH TONOS
0387          ; mapped                 ; 00B7          # 1.1  GREEK ANO TELEIA
0388          ; mapped                 ; 03AD          # 1.1  GREEK CAPITAL LETTER EPSILON WITH TONOS