TDigestReservoirTest.java

/*
 * Copyright 2013 Cloudera Inc.
 *
 * 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 org.kitesdk.morphline.metrics.scalable;

import org.junit.Assert;
import org.junit.Test;

import com.codahale.metrics.Reservoir;

public class TDigestReservoirTest extends Assert {

  @Test
  public void testBasic() throws Exception {
    double maxDelta = 0.00000000001;
    Reservoir reservoir = new TDigestReservoir();
    assertEquals(0, reservoir.size());
    reservoir.update(100);
    reservoir.update(101);
    reservoir.update(300);
    assertEquals(3, reservoir.size());
    assertEquals(3, reservoir.getSnapshot().size());    
    assertEquals(100, reservoir.getSnapshot().getMin());    
    assertEquals(300, reservoir.getSnapshot().getMax());    
    assertEquals(101, reservoir.getSnapshot().getMedian(), maxDelta);    
    assertEquals(101, reservoir.getSnapshot().getValue(0.5), maxDelta);    
    assertEquals(501.0 / 3, reservoir.getSnapshot().getMean(), maxDelta);    
  }
  
}