ExposedLinkedListTest.java

/*
 * Copyright (C) 2015 SoftIndex LLC.
 *
 * 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 io.datakernel.http;

import io.datakernel.http.ExposedLinkedList.Node;
import org.junit.Before;
import org.junit.Test;

import static org.junit.Assert.*;

public class ExposedLinkedListTest {
	private ExposedLinkedList<String> list;

	@Before
	public void before() {
		list = ExposedLinkedList.create();
	}

	@Test
	public void testAdd() {
		assertTrue(list.isEmpty());
		assertEquals(0, list.size());
		assertNull(list.getFirstNode());
		assertNull(list.getLastNode());

		list.addFirstValue("2");
		assertEquals("2", list.getFirstNode().getValue());
		assertEquals("2", list.getLastNode().getValue());

		list.addFirstValue("1");
		assertEquals("1", list.getFirstNode().getValue());
		assertEquals("2", list.getLastNode().getValue());

		list.addLastValue("3");
		assertEquals("3", list.getLastNode().getValue());

		list.addLastValue("4");
		assertEquals("4", list.getLastNode().getValue());

		assertFalse(list.isEmpty());
		assertEquals(4, list.size());
		assertList("1", "2", "3", "4");

		list.clear();
		list.addLastValue("2");
		assertList("2");
	}

	@Test
	public void testRemove() {
		assertNull(list.removeFirstNode());
		assertNull(list.removeLastNode());

		list.addLastValue("1");
		Node<String> node = list.addLastValue("2");
		list.addLastValue("3");
		list.addLastValue("4");

		list.removeNode(node);
		assertList("1", "3", "4");

		assertNotNull(list.removeFirstNode());
		assertList("3", "4");

		assertNotNull(list.removeLastNode());
		assertList("3");

		list.clear();
		assertTrue(list.isEmpty());

		list.addLastValue("new");
		assertList("new");
	}

	@Test
	public void testMoveToFirst() {
		list.addLastValue("1");
		Node<String> el1 = list.addLastValue("2");
		list.addLastValue("3");
		Node<String> el2 = list.addLastValue("4");
		assertEquals("1", list.getFirstNode().getValue());
		assertEquals("4", list.getLastNode().getValue());

		list.moveNodeToFirst(el1);
		assertEquals("2", list.getFirstNode().getValue());
		assertEquals("4", list.getLastNode().getValue());
		assertList("2", "1", "3", "4");

		list.moveNodeToFirst(el1);
		assertEquals("2", list.getFirstNode().getValue());
		assertEquals("4", list.getLastNode().getValue());
		assertList("2", "1", "3", "4");

		list.moveNodeToFirst(el2);
		assertEquals("4", list.getFirstNode().getValue());
		assertEquals("3", list.getLastNode().getValue());
		assertList("4", "2", "1", "3");
	}

	@Test
	public void testMoveToLast() {
		list.addLastValue("1");
		Node<String> el1 = list.addLastValue("2");
		list.addLastValue("3");
		Node<String> el2 = list.addLastValue("4");

		assertEquals("1", list.getFirstNode().getValue());
		assertEquals("4", list.getLastNode().getValue());

		list.moveNodeToLast(el1);
		assertEquals("1", list.getFirstNode().getValue());
		assertEquals("2", list.getLastNode().getValue());
		assertList("1", "3", "4", "2");

		list.moveNodeToLast(el1);
		assertEquals("1", list.getFirstNode().getValue());
		assertEquals("2", list.getLastNode().getValue());
		assertList("1", "3", "4", "2");

		list.moveNodeToLast(el2);
		assertEquals("1", list.getFirstNode().getValue());
		assertEquals("4", list.getLastNode().getValue());
		assertList("1", "3", "2", "4");
	}

	private void assertList(String... expected) {
		Node<String> node = list.getFirstNode();
		for (String e : expected) {
			assertNotNull(node);
			assertEquals(e, node.getValue());
			node = node.getNext();
		}
	}

}