//
//  ========================================================================
//  Copyright (c) 1995-2020 Mort Bay Consulting Pty Ltd and others.
//  ------------------------------------------------------------------------
//  All rights reserved. This program and the accompanying materials
//  are made available under the terms of the Eclipse Public License v1.0
//  and Apache License v2.0 which accompanies this distribution.
//
//      The Eclipse Public License is available at
//      http://www.eclipse.org/legal/epl-v10.html
//
//      The Apache License v2.0 is available at
//      http://www.opensource.org/licenses/apache2.0.php
//
//  You may elect to redistribute this code under either of these licenses.
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package org.eclipse.jetty.util.statistic;

import java.util.concurrent.TimeUnit;

import org.hamcrest.Matchers;
import org.junit.jupiter.api.Test;

import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.equalTo;

public class RateStatisticTest
{
    @Test
    public void testRate()
        throws Exception
    {
        RateStatistic rs = new RateStatistic(1, TimeUnit.HOURS);
        assertThat(rs.getCount(), equalTo(0L));
        assertThat(rs.getRate(), equalTo(0));
        assertThat(rs.getMax(), equalTo(0L));

        rs.record();
        assertThat(rs.getCount(), equalTo(1L));
        assertThat(rs.getRate(), equalTo(1));
        assertThat(rs.getMax(), equalTo(1L));

        rs.age(35, TimeUnit.MINUTES);
        assertThat(rs.getCount(), equalTo(1L));
        assertThat(rs.getRate(), equalTo(1));
        assertThat(rs.getMax(), equalTo(1L));
        assertThat(rs.getOldest(TimeUnit.MINUTES), Matchers.is(35L));

        rs.record();
        assertThat(rs.getCount(), equalTo(2L));
        assertThat(rs.getRate(), equalTo(2));
        assertThat(rs.getMax(), equalTo(2L));

        rs.age(35, TimeUnit.MINUTES);
        assertThat(rs.getCount(), equalTo(2L));
        assertThat(rs.getRate(), equalTo(1));
        assertThat(rs.getMax(), equalTo(2L));

        rs.record();
        assertThat(rs.getCount(), equalTo(3L));
        assertThat(rs.getRate(), equalTo(2));
        assertThat(rs.getMax(), equalTo(2L));

        rs.age(35, TimeUnit.MINUTES);
        assertThat(rs.getCount(), equalTo(3L));
        assertThat(rs.getRate(), equalTo(1));
        assertThat(rs.getMax(), equalTo(2L));
    }
}
