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.cassandra.sidecar.metrics;
  
  import org.junit.jupiter.api.Test;
  
  import static org.assertj.core.api.Assertions.assertThat;
  
  /**
   * Tests for the new metric type added {@link DeltaGauge}
   */
  class DeltaGaugeTest
  {
      @Test
      void testCumulativeCountIncremented()
      {
          DeltaGauge deltaGauge = new DeltaGauge();
  
          assertThat(deltaGauge.getValue()).isEqualTo(0L);
          deltaGauge.increment();
          assertThat(deltaGauge.getValue()).isEqualTo(1L);
          assertThat(deltaGauge.getValue()).isEqualTo(0L);
          deltaGauge.increment();
          deltaGauge.increment();
          deltaGauge.increment();
          assertThat(deltaGauge.getValue()).isEqualTo(3L);
          assertThat(deltaGauge.getValue()).isEqualTo(0L);
          assertThat(deltaGauge.getValue()).isEqualTo(0L);
      }
  
      @Test
      void testCumulativeCountUpdated()
      {
          DeltaGauge deltaGauge = new DeltaGauge();
  
          deltaGauge.update(3);
          deltaGauge.update(7);
          assertThat(deltaGauge.getValue()).isEqualTo(10);
          assertThat(deltaGauge.getValue()).isEqualTo(0);
          deltaGauge.update(2);
          assertThat(deltaGauge.getValue()).isEqualTo(2);
          assertThat(deltaGauge.getValue()).isEqualTo(0);
          deltaGauge.update(3);
          deltaGauge.update(1);
          deltaGauge.update(0);
          assertThat(deltaGauge.getValue()).isEqualTo(4);
          assertThat(deltaGauge.getValue()).isEqualTo(0);
      }
  }
  