Set<Object> keys = cache.asMap().keySet();
      assertThat(keys.remove(null)).isFalse();
      assertThat(keys.remove(6)).isFalse();
      assertThat(keys.remove(-6)).isFalse();
      assertThat(keys.removeAll(asList(null, 0, 15, 1500))).isFalse();
      assertThat(keys.retainAll(asList(null, 0, 15, 1500))).isFalse();
      checkEmpty(keys);
      checkEmpty(cache);
    }
  }

    assertThat(retryTlsHandshake(exception)).isFalse()
  }

  @Test fun nonRetryableSSLHandshakeException() {
    val exception =
      SSLHandshakeException("Certificate handshake exception").apply {
        initCause(CertificateException())
      }
    assertThat(retryTlsHandshake(exception)).isFalse()
  }

  @Test fun retryableSSLHandshakeException() {

    putEdge(N1, N2);
    assertThat(graph.hasEdgeConnecting(EndpointPair.ordered(N2, N1))).isFalse();
  }

  @Test
  public void hasEdgeConnecting_mismatch() {
    putEdge(N1, N2);
    assertThat(graph.hasEdgeConnecting(EndpointPair.unordered(N1, N2))).isFalse();
    assertThat(graph.hasEdgeConnecting(EndpointPair.unordered(N2, N1))).isFalse();
  }

  @Test
  public void hasEdgeConnecting_missingNode() {

      assertThat(header.tagClass).isEqualTo(DerHeader.TAG_CLASS_UNIVERSAL)
      assertThat(header.tag).isEqualTo(30)
      assertThat(header.constructed).isFalse()
      assertThat(header.length).isEqualTo(201)
    }

    assertThat(derReader.hasNext()).isFalse()
  }

  @Test fun `decode length encoded with leading zero byte`() {
    val buffer =
      Buffer()
        .writeByte(0b00000010)

    client.webSocket!!.close(1000, "Hello!")
    // This will trigger a close response.
    assertThat(server.processNextFrame()).isFalse()
    server.listener.assertClosing(1000, "Hello!")
    server.webSocket!!.finishReader()
    server.webSocket!!.close(1000, "Goodbye!")
    assertThat(client.processNextFrame()).isFalse()
    client.listener.assertClosing(1000, "Goodbye!")
    client.webSocket!!.finishReader()

    checkArgument(xDelta != 0.0);
    checkArgument(yDelta != 0.0);
    assertThat(transformation.isHorizontal()).isFalse();
    assertThat(transformation.isVertical()).isFalse();
    assertThat(transformation.inverse().isHorizontal()).isFalse();
    assertThat(transformation.inverse().isVertical()).isFalse();
    assertThat(transformation.transform(x1)).isWithin(ALLOWED_ERROR).of(y1);

        Object value = warmed.get(i - WARMUP_MIN).getValue();
        assertThat(cache.asMap().remove(key, -1)).isFalse();
        assertThat(cache.asMap().remove(key, value)).isTrue();
        assertThat(cache.asMap().remove(key, -1)).isFalse();
        assertThat(cache.asMap().containsKey(key)).isFalse();
      }
      checkEmpty(cache);
    }
  }


  public void testKeySet_populated() {

    assertThat(future.set(99)).isFalse();
    assertThat(future.setException(new IndexOutOfBoundsException())).isFalse();
    assertThat(future.setFuture(new AbstractFuture<Integer>() {})).isFalse();
    assertThat(future.setFuture(immediateFuture(99))).isFalse();
  }

  private static void assertCannotCancel(AbstractFuture<?> future) {
    assertThat(future.cancel(true)).isFalse();
    assertThat(future.cancel(false)).isFalse();

    testInstances += this

    assertThat(serverA.started).isTrue()
    assertThat(serverB.started).isTrue()
    assertThat(serverC.started).isFalse()

    assertThat(serverD.started).isTrue()
    assertThat(serverE.started).isTrue()
    assertThat(serverF.started).isFalse()
  }

  private companion object {
    val testInstances = CopyOnWriteArrayList<StartStopTest>()

    private val dispatcherD = ClosableDispatcher()

    assertThat(graph.hasEdgeConnecting(EndpointPair.ordered(N1, N2))).isFalse();
    assertThat(graph.hasEdgeConnecting(EndpointPair.ordered(N2, N1))).isFalse();
  }

  @Test
  public void hasEdgeConnecting_missingNode() {
    // both nodes missing
    assertThat(
            graph.hasEdgeConnecting(EndpointPair.unordered(NODE_NOT_IN_GRAPH, NODE_NOT_IN_GRAPH)))
        .isFalse();

    // one node present, the other missing