/**
* The MIT License
* Copyright (c) 2014-2016 Ilkka Seppälä
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package com.iluwatar.nullobject;
import ch.qos.logback.classic.Logger;
import ch.qos.logback.classic.spi.ILoggingEvent;
import ch.qos.logback.core.AppenderBase;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.slf4j.LoggerFactory;
import java.util.LinkedList;
import java.util.List;
import static org.junit.Assert.*;
/**
* Date: 12/26/15 - 11:44 PM
*
* @author Jeroen Meulemeester
*/
public class TreeTest {
private InMemoryAppender appender;
@Before
public void setUp() {
appender = new InMemoryAppender();
}
@After
public void tearDown() {
appender.stop();
}
/**
* During the tests, the same tree structure will be used, shown below. End points will be
* terminated with the {@link NullNode} instance.
*
* <pre>
* root
* ├── level1_a
* │ ├── level2_a
* │ │ ├── level3_a
* │ │ └── level3_b
* │ └── level2_b
* └── level1_b
* </pre>
*/
private static final Node TREE_ROOT;
static {
final NodeImpl level1B = new NodeImpl("level1_b", NullNode.getInstance(), NullNode.getInstance());
final NodeImpl level2B = new NodeImpl("level2_b", NullNode.getInstance(), NullNode.getInstance());
final NodeImpl level3A = new NodeImpl("level3_a", NullNode.getInstance(), NullNode.getInstance());
final NodeImpl level3B = new NodeImpl("level3_b", NullNode.getInstance(), NullNode.getInstance());
final NodeImpl level2A = new NodeImpl("level2_a", level3A, level3B);
final NodeImpl level1A = new NodeImpl("level1_a", level2A, level2B);
TREE_ROOT = new NodeImpl("root", level1A, level1B);
}
/**
* Verify the number of items in the tree. The root has 6 children so we expect a {@link
* Node#getTreeSize()} of 7 {@link Node}s in total.
*/
@Test
public void testTreeSize() {
assertEquals(7, TREE_ROOT.getTreeSize());
}
/**
* Walk through the tree and verify if every item is handled
*/
@Test
public void testWalk() {
TREE_ROOT.walk();
assertTrue(appender.logContains("root"));
assertTrue(appender.logContains("level1_a"));
assertTrue(appender.logContains("level2_a"));
assertTrue(appender.logContains("level3_a"));
assertTrue(appender.logContains("level3_b"));
assertTrue(appender.logContains("level2_b"));
assertTrue(appender.logContains("level1_b"));
assertEquals(7, appender.getLogSize());
}
@Test
public void testGetLeft() throws Exception {
final Node level1 = TREE_ROOT.getLeft();
assertNotNull(level1);
assertEquals("level1_a", level1.getName());
assertEquals(5, level1.getTreeSize());
final Node level2 = level1.getLeft();
assertNotNull(level2);
assertEquals("level2_a", level2.getName());
assertEquals(3, level2.getTreeSize());
final Node level3 = level2.getLeft();
assertNotNull(level3);
assertEquals("level3_a", level3.getName());
assertEquals(1, level3.getTreeSize());
assertSame(NullNode.getInstance(), level3.getRight());
assertSame(NullNode.getInstance(), level3.getLeft());
}
@Test
public void testGetRight() throws Exception {
final Node level1 = TREE_ROOT.getRight();
assertNotNull(level1);
assertEquals("level1_b", level1.getName());
assertEquals(1, level1.getTreeSize());
assertSame(NullNode.getInstance(), level1.getRight());
assertSame(NullNode.getInstance(), level1.getLeft());
}
private class InMemoryAppender extends AppenderBase<ILoggingEvent> {
private List<ILoggingEvent> log = new LinkedList<>();
public InMemoryAppender() {
((Logger) LoggerFactory.getLogger("root")).addAppender(this);
start();
}
@Override
protected void append(ILoggingEvent eventObject) {
log.add(eventObject);
}
public boolean logContains(String message) {
return log.stream().anyMatch(event -> event.getMessage().equals(message));
}
public int getLogSize() {
return log.size();
}
}
}