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.common.metrics;
  
  import org.apache.kafka.common.MetricName;
  import org.apache.kafka.common.utils.MockTime;
  
  import org.junit.jupiter.api.Test;
  
  import java.util.Collections;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  public class KafkaMetricTest {
  
      private static final MetricName METRIC_NAME = new MetricName("name", "group", "description", Collections.emptyMap());
  
      @Test
      public void testIsMeasurable() {
          Measurable metricValueProvider = (config, now) -> 0;
          KafkaMetric metric = new KafkaMetric(new Object(), METRIC_NAME, metricValueProvider, new MetricConfig(), new MockTime());
          assertTrue(metric.isMeasurable());
          assertEquals(metricValueProvider, metric.measurable());
      }
  
      @Test
      public void testIsMeasurableWithGaugeProvider() {
          Gauge<Double> metricValueProvider = (config, now) -> 0.0;
          KafkaMetric metric = new KafkaMetric(new Object(), METRIC_NAME, metricValueProvider, new MetricConfig(), new MockTime());
          assertFalse(metric.isMeasurable());
          assertThrows(IllegalStateException.class, metric::measurable);
      }
  
  }
  