/*
 * 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.onlab.util;

import org.junit.Test;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import static org.onlab.junit.TestTools.delay;

/**
 * Tests of the Counter utility.
 */
public class CounterTest {

    @Test
    public void basics() {
        Counter tt = new Counter();
        assertEquals("incorrect number of bytes", 0L, tt.total());
        assertEquals("incorrect throughput", 0.0, tt.throughput(), 0.0001);
        tt.add(1234567890L);
        assertEquals("incorrect number of bytes", 1234567890L, tt.total());
        assertTrue("incorrect throughput", 1234567890.0 < tt.throughput());
        delay(1500);
        tt.add(1L);
        assertEquals("incorrect number of bytes", 1234567891L, tt.total());
        assertTrue("incorrect throughput", 1234567891.0 > tt.throughput());
        tt.reset();
        assertEquals("incorrect number of bytes", 0L, tt.total());
        assertEquals("incorrect throughput", 0.0, tt.throughput(), 0.0001);
    }

    @Test
    public void freeze() {
        Counter tt = new Counter();
        tt.add(123L);
        assertEquals("incorrect number of bytes", 123L, tt.total());
        delay(1000);
        tt.freeze();
        tt.add(123L);
        assertEquals("incorrect number of bytes", 123L, tt.total());

        double d = tt.duration();
        double t = tt.throughput();
        assertEquals("incorrect duration", d, tt.duration(), 0.0001);
        assertEquals("incorrect throughput", t, tt.throughput(), 0.0001);
        assertEquals("incorrect number of bytes", 123L, tt.total());
    }

    @Test
    public void reset() {
        Counter tt = new Counter();
        tt.add(123L);
        assertEquals("incorrect number of bytes", 123L, tt.total());

        double d = tt.duration();
        double t = tt.throughput();
        assertEquals("incorrect duration", d, tt.duration(), 0.0001);
        assertEquals("incorrect throughput", t, tt.throughput(), 0.0001);
        assertEquals("incorrect number of bytes", 123L, tt.total());

        tt.reset();
        assertEquals("incorrect throughput", 0.0, tt.throughput(), 0.0001);
        assertEquals("incorrect number of bytes", 0, tt.total());
    }

    @Test
    public void syntheticTracker() {
        Counter tt = new Counter(5000, 1000, 6000);
        assertEquals("incorrect duration", 1, tt.duration(), 0.1);
        assertEquals("incorrect throughput", 1000, tt.throughput(), 1.0);
    }
}