### Question:
RlpxAgent { public int getConnectionCount() { return Math.toIntExact(streamConnections().count()); } private  RlpxAgent(
      final LocalNode localNode,
      final PeerConnectionEvents connectionEvents,
      final ConnectionInitializer connectionInitializer,
      final PeerRlpxPermissions peerPermissions,
      final PeerPrivileges peerPrivileges,
      final int maxConnections,
      final int maxRemotelyInitiatedConnections,
      final MetricsSystem metricsSystem); static Builder builder(); CompletableFuture<Integer> start(); CompletableFuture<Void> stop(); Stream<? extends PeerConnection> streamConnections(); int getConnectionCount(); void connect(final Stream<? extends Peer> peerStream); void disconnect(final Bytes peerId, final DisconnectReason reason); Optional<CompletableFuture<PeerConnection>> getPeerConnection(final Peer peer); CompletableFuture<PeerConnection> connect(final Peer peer); void subscribeMessage(final Capability capability, final MessageCallback callback); void subscribeConnect(final ConnectCallback callback); void subscribeDisconnect(final DisconnectCallback callback);  }### Answer:
@Test public void incomingConnect_failsIfAgentIsNotReady() { final Peer peer = createPeer(); final PeerConnection connection = connection(peer); connectionInitializer.simulateIncomingConnection(connection); assertPeerConnectionNotTracked(peer); assertThat(agent.getConnectionCount()).isEqualTo(0); }
@Test public void incomingConnection_succeedsForPrivilegedPeerWhenMaxRemoteConnectionsExceeded() { final int maxPeers = 5; final int maxRemotePeers = 3; final float maxRemotePeersFraction = (float) maxRemotePeers / (float) maxPeers; config.setLimitRemoteWireConnectionsEnabled(true); config.setFractionRemoteWireConnectionsAllowed(maxRemotePeersFraction); startAgentWithMaxPeers(maxPeers); for (int i = 0; i < maxRemotePeers; i++) { final Peer remotelyInitiatedPeer = createPeer(); final MockPeerConnection incomingConnection = connection(remotelyInitiatedPeer); connectionInitializer.simulateIncomingConnection(incomingConnection); assertThat(incomingConnection.getDisconnectReason()).isEmpty(); } assertThat(agent.getConnectionCount()).isEqualTo(maxRemotePeers); final Peer privilegedPeer = createPeer(); when(peerPrivileges.canExceedConnectionLimits(privilegedPeer)).thenReturn(true); final MockPeerConnection privilegedConnection = connection(privilegedPeer); connectionInitializer.simulateIncomingConnection(privilegedConnection); assertThat(privilegedConnection.isDisconnected()).isFalse(); assertThat(agent.getConnectionCount()).isEqualTo(maxRemotePeers + 1); final Peer remotelyInitiatedPeer = createPeer(); final MockPeerConnection incomingConnection = connection(remotelyInitiatedPeer); connectionInitializer.simulateIncomingConnection(incomingConnection); assertThat(agent.getConnectionCount()).isEqualTo(maxRemotePeers + 1); assertThat(incomingConnection.getDisconnectReason()).contains(DisconnectReason.TOO_MANY_PEERS); }
@Test public void getConnectionCount() throws ExecutionException, InterruptedException { startAgent(); final Peer peerA = createPeer(); final Peer peerB = createPeer(); final Peer peerC = createPeer(); assertThat(agent.getConnectionCount()).isEqualTo(0); agent.connect(peerA); assertThat(agent.getConnectionCount()).isEqualTo(1); agent.connect(peerA); assertThat(agent.getConnectionCount()).isEqualTo(1); agent.connect(peerB); assertThat(agent.getConnectionCount()).isEqualTo(2); agent.connect(peerC); assertThat(agent.getConnectionCount()).isEqualTo(3); agent.disconnect(peerB.getId(), DisconnectReason.UNKNOWN); assertThat(agent.getConnectionCount()).isEqualTo(2); }