MemoryMetricObserverTest.java

/**
 * Copyright 2013 Netflix, Inc.
 * <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.netflix.servo.publish;

import com.netflix.servo.Metric;
import com.netflix.servo.tag.SortedTagList;
import com.netflix.servo.util.UnmodifiableList;
import org.testng.annotations.Test;

import java.util.List;

import static org.testng.Assert.assertEquals;

public class MemoryMetricObserverTest {

  private List<Metric> mkList(int v) {
    return UnmodifiableList.of(new Metric("m", SortedTagList.EMPTY, 0L, v));
  }

  @Test
  public void testUpdate() throws Exception {
    MemoryMetricObserver mmo = new MemoryMetricObserver("test", 2);
    mmo.update(mkList(1));
    assertEquals(mmo.getObservations(), UnmodifiableList.of(mkList(1)));
  }

  @Test
  public void testExceedN() throws Exception {
    MemoryMetricObserver mmo = new MemoryMetricObserver("test", 2);
    mmo.update(mkList(1));
    mmo.update(mkList(2));
    mmo.update(mkList(3));
    assertEquals(mmo.getObservations(),
        UnmodifiableList.of(mkList(2), mkList(3)));
  }
}