content: /**
   * Copyright 2020 Alibaba Group Holding Limited.
   *
   * <p>Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
   * except in compliance with the License. You may obtain a copy of the License at
   *
   * <p>http://www.apache.org/licenses/LICENSE-2.0
   *
   * <p>Unless required by applicable law or agreed to in writing, software distributed under the
   * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
   * express or implied. See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package com.alibaba.graphscope.groot.tests.coordinator;
  
  import static org.mockito.Mockito.*;
  
  import com.alibaba.graphscope.groot.common.RoleType;
  import com.alibaba.graphscope.groot.common.config.CommonConfig;
  import com.alibaba.graphscope.groot.common.config.Configs;
  import com.alibaba.graphscope.groot.coordinator.FrontendSnapshotClient;
  import com.alibaba.graphscope.groot.coordinator.NotifyFrontendListener;
  import com.alibaba.graphscope.groot.coordinator.SnapshotManager;
  import com.alibaba.graphscope.groot.coordinator.SnapshotNotifier;
  import com.alibaba.graphscope.groot.discovery.GrootNode;
  import com.alibaba.graphscope.groot.discovery.NodeDiscovery;
  import com.alibaba.graphscope.groot.rpc.RoleClients;
  
  import org.junit.jupiter.api.Test;
  import org.mockito.ArgumentCaptor;
  
  import java.util.Collections;
  
  public class SnapshotNotifierTest {
  
      @Test
      void testSnapshotNotifier() {
          NodeDiscovery discovery = mock(NodeDiscovery.class);
          SnapshotManager snapshotManager = mock(SnapshotManager.class);
          RoleClients<FrontendSnapshotClient> roleClients = mock(RoleClients.class);
          SnapshotNotifier snapshotNotifier =
                  new SnapshotNotifier(discovery, snapshotManager, null, roleClients);
          snapshotNotifier.start();
  
          GrootNode localNode =
                  GrootNode.createLocalNode(
                          Configs.newBuilder()
                                  .put(
                                          CommonConfig.ROLE_NAME.getKey(),
                                          RoleType.COORDINATOR.getName())
                                  .build(),
                          1111);
          snapshotNotifier.nodesJoin(RoleType.FRONTEND, Collections.singletonMap(1, localNode));
          ArgumentCaptor<NotifyFrontendListener> captor =
                  ArgumentCaptor.forClass(NotifyFrontendListener.class);
          verify(snapshotManager).addListener(captor.capture());
          NotifyFrontendListener listener = captor.getValue();
          snapshotNotifier.nodesLeft(RoleType.FRONTEND, Collections.singletonMap(1, localNode));
          verify(snapshotManager).removeListener(listener);
      }
  }
  