SlidingWindowCounterTest.java
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/*
* Copyright 2015 Open Networking Laboratory
*
* 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.onlab.util;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import static junit.framework.TestCase.fail;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
/**
* Unit tests for the sliding window counter.
*/
public class SlidingWindowCounterTest {
private SlidingWindowCounter counter;
@Before
public void setUp() {
counter = new SlidingWindowCounter(2);
}
@After
public void tearDown() {
counter.destroy();
}
@Test
public void testIncrementCount() {
assertEquals(0, counter.get(1));
assertEquals(0, counter.get(2));
counter.incrementCount();
assertEquals(1, counter.get(1));
assertEquals(1, counter.get(2));
counter.incrementCount(2);
assertEquals(3, counter.get(2));
}
@Test
public void testSlide() {
counter.incrementCount();
counter.advanceHead();
assertEquals(0, counter.get(1));
assertEquals(1, counter.get(2));
counter.incrementCount(2);
assertEquals(2, counter.get(1));
assertEquals(3, counter.get(2));
}
@Test
public void testWrap() {
counter.incrementCount();
counter.advanceHead();
counter.incrementCount(2);
counter.advanceHead();
assertEquals(0, counter.get(1));
assertEquals(2, counter.get(2));
counter.advanceHead();
assertEquals(0, counter.get(1));
assertEquals(0, counter.get(2));
}
@Test
public void testCornerCases() {
try {
counter.get(3);
fail("Exception should have been thrown");
} catch (IllegalArgumentException e) {
assertTrue(true);
}
try {
new SlidingWindowCounter(0);
fail("Exception should have been thrown");
} catch (IllegalArgumentException e) {
assertTrue(true);
}
try {
new SlidingWindowCounter(-1);
fail("Exception should have been thrown");
} catch (IllegalArgumentException e) {
assertTrue(true);
}
}
}