content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements. See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You 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 org.apache.kafka.coordinator.common.runtime;
  
  import org.apache.kafka.common.MetricName;
  import org.apache.kafka.common.metrics.CompoundStat;
  import org.apache.kafka.common.metrics.Metrics;
  
  import org.junit.jupiter.api.Test;
  
  import java.util.Map;
  import java.util.Set;
  import java.util.stream.Collectors;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  
  public class KafkaMetricHistogramTest {
  
      @Test
      public void testStats() {
          try (Metrics metrics = new Metrics()) {
              KafkaMetricHistogram histogram = KafkaMetricHistogram.newLatencyHistogram(
                  suffix -> metrics.metricName(
                      "test-metric-" + suffix,
                      "test-group",
                      "test description"
                  )
              );
  
              Set<MetricName> expected = Set.of(
                  new MetricName("test-metric-max", "test-group", "test description", Map.of()),
                  new MetricName("test-metric-p999", "test-group", "test description", Map.of()),
                  new MetricName("test-metric-p99", "test-group", "test description", Map.of()),
                  new MetricName("test-metric-p95", "test-group", "test description", Map.of()),
                  new MetricName("test-metric-p50", "test-group", "test description", Map.of())
              );
              Set<MetricName> actual = histogram.stats().stream().map(CompoundStat.NamedMeasurable::name).collect(Collectors.toSet());
              assertEquals(expected, actual);
          }
      }
  }
  