content: /*
   * Copyright 1999-2023 Alibaba Group Holding Ltd.
   *
   * 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
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * 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.nacos.core.monitor.topn;
  
  import com.alibaba.nacos.common.event.ServerConfigChangeEvent;
  import com.alibaba.nacos.common.utils.Pair;
  import com.alibaba.nacos.sys.env.EnvUtil;
  import org.junit.jupiter.api.AfterEach;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  import org.springframework.mock.env.MockEnvironment;
  
  import java.util.Arrays;
  import java.util.List;
  import java.util.concurrent.atomic.AtomicInteger;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  /**
   * unit test for TopNCounterMetricsContainer.
   *
   * @author <a href="mailto:liuyixiao0821@gmail.com">liuyixiao</a>
   */
  class StringTopNCounterTest {
      
      private StringTopNCounter stringTopNCounter;
      
      @BeforeEach
      void setUp() {
          stringTopNCounter = new StringTopNCounter();
      }
      
      @AfterEach
      void tearDown() {
          stringTopNCounter.reset();
          EnvUtil.setEnvironment(new MockEnvironment());
          TopNConfig.getInstance().onEvent(new ServerConfigChangeEvent());
      }
      
      @Test
      void testSet() {
          stringTopNCounter.set("test1", 1);
          List<Pair<String, AtomicInteger>> actual = stringTopNCounter.getCounterOfTopN(10);
          assertTopNCounter(actual, 1, new String[] {"test1"}, new Integer[] {1});
      }
      
      @Test
      void testIncrement() {
          stringTopNCounter.set("test", 0);
          assertTopNCounter(stringTopNCounter.getCounterOfTopN(10), 1, new String[] {"test"}, new Integer[] {0});
          stringTopNCounter.increment("test");
          assertTopNCounter(stringTopNCounter.getCounterOfTopN(10), 1, new String[] {"test"}, new Integer[] {1});
      }
      
      @Test
      void testReset() {
          stringTopNCounter.set("test", 1);
          stringTopNCounter.set("test1", 2);
          stringTopNCounter.set("test2", 3);
          assertTopNCounter(stringTopNCounter.getCounterOfTopN(10), 3, new String[] {"test2", "test1", "test"}, new Integer[] {3, 2, 1});
          stringTopNCounter.reset();
          assertTopNCounter(stringTopNCounter.getCounterOfTopN(10), 0, new String[] {}, new Integer[] {});
      }
      
      @Test
      void testGetTopNCounter() {
          for (int i = 0; i < 20; i++) {
              stringTopNCounter.set("test" + i, i);
          }
          assertTopNCounter(stringTopNCounter.getCounterOfTopN(10), 10,
                  new String[] {"test19", "test18", "test17", "test16", "test15", "test14", "test13", "test12", "test11", "test10"},
                  new Integer[] {19, 18, 17, 16, 15, 14, 13, 12, 11, 10});
      }
      
      @Test
      void testForTopnDisabled() {
          MockEnvironment env = new MockEnvironment();
          env.setProperty("nacos.core.monitor.topn.enabled", "false");
          EnvUtil.setEnvironment(env);
          TopNConfig.getInstance().onEvent(new ServerConfigChangeEvent());
          stringTopNCounter.set("test", 1);
          stringTopNCounter.set("test1", 2);
          stringTopNCounter.set("test2", 3);
          assertTopNCounter(stringTopNCounter.getCounterOfTopN(10), 0, new String[] {}, new Integer[] {});
      }
      
      private void assertTopNCounter(List<Pair<String, AtomicInteger>> actual, int size, String[] keys, Integer[] value) {
          assertEquals(size, actual.size());
          for (int i = 0; i < size; i++) {
              assertTrue(Arrays.asList(keys).contains(actual.get(i).getFirst()));
              assertTrue(Arrays.asList(value).contains(actual.get(i).getSecond().get()));
          }
      }
  }
  