RunningAverageTest.java

package com.cloudhopper.commons.util;

/*
 * #%L
 * ch-commons-util
 * %%
 * Copyright (C) 2012 Cloudhopper by Twitter
 * %%
 * 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.
 * #L%
 */

// third party imports
import org.junit.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 *
 * @author joelauer (twitter: @jjlauer or <a href="http://twitter.com/jjlauer" target=window>http://twitter.com/jjlauer</a>)
 */
public class RunningAverageTest {
    private static final Logger logger = LoggerFactory.getLogger(RunningAverageTest.class);

    @Test
    public void runningAverage() {
        RunningAverage avg = new RunningAverage(3, 1);
        Assert.assertEquals("0.0", avg.toString());
        avg.add(2);
        Assert.assertEquals("2.0", avg.toString());
        avg.add(3);
        Assert.assertEquals("2.5", avg.toString());
        avg.add(4);
        Assert.assertEquals("3.0", avg.toString());
        avg.add(5);
        // last value should have kicked out the 2 above
        Assert.assertEquals("4.0", avg.toString());
        Assert.assertEquals("4.000", avg.toString(3));
        Assert.assertEquals("4", avg.toString(0));
    }
}