/*
 * Copyright (C) 2009, Google Inc.
 * and other copyright owners as documented in the project's IP log.
 *
 * This program and the accompanying materials are made available
 * under the terms of the Eclipse Distribution License v1.0 which
 * accompanies this distribution, is reproduced below, and is
 * available at http://www.eclipse.org/org/documents/edl-v10.php
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or
 * without modification, are permitted provided that the following
 * conditions are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials provided
 *   with the distribution.
 *
 * - Neither the name of the Eclipse Foundation, Inc. nor the
 *   names of its contributors may be used to endorse or promote
 *   products derived from this software without specific prior
 *   written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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package org.eclipse.jgit.revwalk;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertSame;

import java.util.ArrayList;

import org.junit.Test;

public class FIFORevQueueTest extends RevQueueTestCase<FIFORevQueue> {
	@Override
	protected FIFORevQueue create() {
		return new FIFORevQueue();
	}

	@Override
	@Test
	public void testEmpty() throws Exception {
		super.testEmpty();
		assertEquals(0, q.outputType());
	}

	@Test
	public void testCloneEmpty() throws Exception {
		q = new FIFORevQueue(AbstractRevQueue.EMPTY_QUEUE);
		assertNull(q.next());
	}

	@Test
	public void testAddLargeBlocks() throws Exception {
		final ArrayList<RevCommit> lst = new ArrayList<>();
		for (int i = 0; i < 3 * BlockRevQueue.Block.BLOCK_SIZE; i++) {
			final RevCommit c = commit();
			lst.add(c);
			q.add(c);
		}
		for (int i = 0; i < lst.size(); i++)
			assertSame(lst.get(i), q.next());
	}

	@Test
	public void testUnpopAtFront() throws Exception {
		final RevCommit a = commit();
		final RevCommit b = commit();
		final RevCommit c = commit();

		q.add(a);
		q.unpop(b);
		q.unpop(c);

		assertSame(c, q.next());
		assertSame(b, q.next());
		assertSame(a, q.next());
	}
}