CircularFifoQueueTest.java
/*
* 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
*
* https://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.apache.commons.collections4.queue;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assertions.assertTrue;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.NoSuchElementException;
import java.util.Queue;
import org.junit.jupiter.api.Test;
/**
* Test cases for CircularFifoQueue.
*/
public class CircularFifoQueueTest<E> extends AbstractQueueTest<E> {
/**
* {@inheritDoc}
*/
@Override
public CircularFifoQueue<E> getCollection() {
return (CircularFifoQueue<E>) super.getCollection();
}
@Override
public String getCompatibilityVersion() {
return "4";
}
/**
* Overridden because CircularFifoQueue isn't fail fast.
* @return false
*/
@Override
public boolean isFailFastSupported() {
return false;
}
/**
* Overridden because CircularFifoQueue doesn't allow null elements.
* @return false
*/
@Override
public boolean isNullSupported() {
return false;
}
/**
* Returns an empty ArrayList.
*
* @return an empty ArrayList
*/
@Override
public Collection<E> makeConfirmedCollection() {
return new ArrayList<>();
}
/**
* Returns a full ArrayList.
*
* @return a full ArrayList
*/
@Override
public Collection<E> makeConfirmedFullCollection() {
final Collection<E> c = makeConfirmedCollection();
c.addAll(Arrays.asList(getFullElements()));
return c;
}
/**
* Returns an empty CircularFifoQueue that won't overflow.
*
* @return an empty CircularFifoQueue
*/
@Override
public Queue<E> makeObject() {
return new CircularFifoQueue<>(100);
}
@Test
void testAddNull() {
final CircularFifoQueue<E> b = new CircularFifoQueue<>(2);
assertThrows(NullPointerException.class, () -> b.add(null));
}
/**
* Tests that the removal operation actually removes the first element.
*/
@Test
@SuppressWarnings("unchecked")
void testCircularFifoQueueCircular() {
final List<E> list = new ArrayList<>();
list.add((E) "A");
list.add((E) "B");
list.add((E) "C");
final Queue<E> queue = new CircularFifoQueue<>(list);
assertTrue(queue.contains("A"));
assertTrue(queue.contains("B"));
assertTrue(queue.contains("C"));
queue.add((E) "D");
assertFalse(queue.contains("A"));
assertTrue(queue.contains("B"));
assertTrue(queue.contains("C"));
assertTrue(queue.contains("D"));
assertEquals("B", queue.peek());
assertEquals("B", queue.remove());
assertEquals("C", queue.remove());
assertEquals("D", queue.remove());
}
/**
* Tests that the removal operation actually removes the first element.
*/
@Test
void testCircularFifoQueueRemove() {
resetFull();
final int size = getConfirmed().size();
for (int i = 0; i < size; i++) {
final Object o1 = getCollection().remove();
final Object o2 = ((List<?>) getConfirmed()).remove(0);
assertEquals(o1, o2, "Removed objects should be equal");
verify();
}
assertThrows(NoSuchElementException.class, () -> getCollection().remove(),
"Empty queue should raise Underflow.");
}
/**
* Tests that the constructor correctly throws an exception.
*/
@Test
void testConstructorException1() {
assertThrows(IllegalArgumentException.class, () -> new CircularFifoQueue<E>(0));
}
/**
* Tests that the constructor correctly throws an exception.
*/
@Test
void testConstructorException2() {
assertThrows(IllegalArgumentException.class, () -> new CircularFifoQueue<E>(-20));
}
/**
* Tests that the constructor correctly throws an exception.
*/
@Test
void testConstructorException3() {
assertThrows(NullPointerException.class, () -> new CircularFifoQueue<E>(null));
}
@Test
void testDefaultSizeAndGetError1() {
final CircularFifoQueue<E> fifo = new CircularFifoQueue<>();
assertEquals(32, fifo.maxSize());
fifo.add((E) "1");
fifo.add((E) "2");
fifo.add((E) "3");
fifo.add((E) "4");
fifo.add((E) "5");
assertEquals(5, fifo.size());
assertThrows(NoSuchElementException.class, () -> fifo.get(5));
}
@Test
void testDefaultSizeAndGetError2() {
final CircularFifoQueue<E> fifo = new CircularFifoQueue<>();
assertEquals(32, fifo.maxSize());
fifo.add((E) "1");
fifo.add((E) "2");
fifo.add((E) "3");
fifo.add((E) "4");
fifo.add((E) "5");
assertEquals(5, fifo.size());
assertThrows(NoSuchElementException.class, () -> fifo.get(-2));
}
@Test
void testGetIndex() {
resetFull();
final CircularFifoQueue<E> queue = getCollection();
final List<E> confirmed = (List<E>) getConfirmed();
for (int i = 0; i < confirmed.size(); i++) {
assertEquals(confirmed.get(i), queue.get(i));
}
// remove the first two elements and check again
queue.remove();
queue.remove();
for (int i = 0; i < queue.size(); i++) {
assertEquals(confirmed.get(i + 2), queue.get(i));
}
}
@Test
@SuppressWarnings("unchecked")
void testRemoveError1() throws Exception {
// based on bug 33071
final CircularFifoQueue<E> fifo = new CircularFifoQueue<>(5);
fifo.add((E) "1");
fifo.add((E) "2");
fifo.add((E) "3");
fifo.add((E) "4");
fifo.add((E) "5");
assertEquals("[1, 2, 3, 4, 5]", fifo.toString());
fifo.remove("3");
assertEquals("[1, 2, 4, 5]", fifo.toString());
fifo.remove("4");
assertEquals("[1, 2, 5]", fifo.toString());
}
@Test
@SuppressWarnings("unchecked")
void testRemoveError2() throws Exception {
// based on bug 33071
final CircularFifoQueue<E> fifo = new CircularFifoQueue<>(5);
fifo.add((E) "1");
fifo.add((E) "2");
fifo.add((E) "3");
fifo.add((E) "4");
fifo.add((E) "5");
fifo.add((E) "6");
assertEquals(5, fifo.size());
assertEquals("[2, 3, 4, 5, 6]", fifo.toString());
fifo.remove("3");
assertEquals("[2, 4, 5, 6]", fifo.toString());
fifo.remove("4");
assertEquals("[2, 5, 6]", fifo.toString());
}
@Test
@SuppressWarnings("unchecked")
void testRemoveError3() throws Exception {
// based on bug 33071
final CircularFifoQueue<E> fifo = new CircularFifoQueue<>(5);
fifo.add((E) "1");
fifo.add((E) "2");
fifo.add((E) "3");
fifo.add((E) "4");
fifo.add((E) "5");
assertEquals("[1, 2, 3, 4, 5]", fifo.toString());
fifo.remove("3");
assertEquals("[1, 2, 4, 5]", fifo.toString());
fifo.add((E) "6");
fifo.add((E) "7");
assertEquals("[2, 4, 5, 6, 7]", fifo.toString());
fifo.remove("4");
assertEquals("[2, 5, 6, 7]", fifo.toString());
}
@Test
@SuppressWarnings("unchecked")
void testRemoveError4() throws Exception {
// based on bug 33071
final CircularFifoQueue<E> fifo = new CircularFifoQueue<>(5);
fifo.add((E) "1");
fifo.add((E) "2");
fifo.add((E) "3");
fifo.add((E) "4");
fifo.add((E) "5"); // end=0
fifo.add((E) "6"); // end=1
fifo.add((E) "7"); // end=2
assertEquals("[3, 4, 5, 6, 7]", fifo.toString());
fifo.remove("4"); // remove element in middle of array, after start
assertEquals("[3, 5, 6, 7]", fifo.toString());
}
@Test
@SuppressWarnings("unchecked")
void testRemoveError5() throws Exception {
// based on bug 33071
final CircularFifoQueue<E> fifo = new CircularFifoQueue<>(5);
fifo.add((E) "1");
fifo.add((E) "2");
fifo.add((E) "3");
fifo.add((E) "4");
fifo.add((E) "5"); // end=0
fifo.add((E) "6"); // end=1
fifo.add((E) "7"); // end=2
assertEquals("[3, 4, 5, 6, 7]", fifo.toString());
fifo.remove("5"); // remove element at last pos in array
assertEquals("[3, 4, 6, 7]", fifo.toString());
}
@Test
@SuppressWarnings("unchecked")
void testRemoveError6() throws Exception {
// based on bug 33071
final CircularFifoQueue<E> fifo = new CircularFifoQueue<>(5);
fifo.add((E) "1");
fifo.add((E) "2");
fifo.add((E) "3");
fifo.add((E) "4");
fifo.add((E) "5"); // end=0
fifo.add((E) "6"); // end=1
fifo.add((E) "7"); // end=2
assertEquals("[3, 4, 5, 6, 7]", fifo.toString());
fifo.remove("6"); // remove element at position zero in array
assertEquals("[3, 4, 5, 7]", fifo.toString());
}
@Test
@SuppressWarnings("unchecked")
void testRemoveError7() throws Exception {
// based on bug 33071
final CircularFifoQueue<E> fifo = new CircularFifoQueue<>(5);
fifo.add((E) "1");
fifo.add((E) "2");
fifo.add((E) "3");
fifo.add((E) "4");
fifo.add((E) "5"); // end=0
fifo.add((E) "6"); // end=1
fifo.add((E) "7"); // end=2
assertEquals("[3, 4, 5, 6, 7]", fifo.toString());
fifo.remove("7"); // remove element at position one in array
assertEquals("[3, 4, 5, 6]", fifo.toString());
}
@Test
@SuppressWarnings("unchecked")
void testRemoveError8() throws Exception {
// based on bug 33071
final CircularFifoQueue<E> fifo = new CircularFifoQueue<>(5);
fifo.add((E) "1");
fifo.add((E) "2");
fifo.add((E) "3");
fifo.add((E) "4");
fifo.add((E) "5"); // end=0
fifo.add((E) "6"); // end=1
fifo.add((E) "7"); // end=2
fifo.add((E) "8"); // end=3
assertEquals("[4, 5, 6, 7, 8]", fifo.toString());
fifo.remove("7"); // remove element at position one in array, need to shift 8
assertEquals("[4, 5, 6, 8]", fifo.toString());
}
@Test
@SuppressWarnings("unchecked")
void testRemoveError9() throws Exception {
// based on bug 33071
final CircularFifoQueue<E> fifo = new CircularFifoQueue<>(5);
fifo.add((E) "1");
fifo.add((E) "2");
fifo.add((E) "3");
fifo.add((E) "4");
fifo.add((E) "5"); // end=0
fifo.add((E) "6"); // end=1
fifo.add((E) "7"); // end=2
fifo.add((E) "8"); // end=3
assertEquals("[4, 5, 6, 7, 8]", fifo.toString());
fifo.remove("8"); // remove element at position two in array
assertEquals("[4, 5, 6, 7]", fifo.toString());
}
@Test
@SuppressWarnings("unchecked")
void testRepeatedSerialization() throws Exception {
// bug 31433
final CircularFifoQueue<E> b = new CircularFifoQueue<>(2);
b.add((E) "a");
assertEquals(1, b.size());
assertTrue(b.contains("a"));
ByteArrayOutputStream bos = new ByteArrayOutputStream();
new ObjectOutputStream(bos).writeObject(b);
final CircularFifoQueue<E> b2 = (CircularFifoQueue<E>) new ObjectInputStream(
new ByteArrayInputStream(bos.toByteArray())).readObject();
assertEquals(1, b2.size());
assertTrue(b2.contains("a"));
b2.add((E) "b");
assertEquals(2, b2.size());
assertTrue(b2.contains("a"));
assertTrue(b2.contains("b"));
bos = new ByteArrayOutputStream();
new ObjectOutputStream(bos).writeObject(b2);
final CircularFifoQueue<E> b3 = (CircularFifoQueue<E>) new ObjectInputStream(
new ByteArrayInputStream(bos.toByteArray())).readObject();
assertEquals(2, b3.size());
assertTrue(b3.contains("a"));
assertTrue(b3.contains("b"));
b3.add((E) "c");
assertEquals(2, b3.size());
assertTrue(b3.contains("b"));
assertTrue(b3.contains("c"));
}
// void testCreate() throws Exception {
// resetEmpty();
// writeExternalFormToDisk((java.io.Serializable) getCollection(), "src/test/resources/data/test/CircularFifoQueue.emptyCollection.version4.obj");
// resetFull();
// writeExternalFormToDisk((java.io.Serializable) getCollection(), "src/test/resources/data/test/CircularFifoQueue.fullCollection.version4.obj");
// }
/**
* Runs through the regular verifications, but also verifies that
* the buffer contains the same elements in the same sequence as the
* list.
*/
@Override
public void verify() {
super.verify();
final Iterator<E> iterator1 = getCollection().iterator();
for (final E e : getConfirmed()) {
assertTrue(iterator1.hasNext());
final Object o1 = iterator1.next();
final Object o2 = e;
assertEquals(o1, o2);
}
}
}