/*
 * Copyright (C) 2011, Robin Stocker <robin@nibor.org>
 * 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
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.eclipse.jgit.revwalk;

import static org.junit.Assert.assertEquals;

import org.junit.Test;

public class RevWalkUtilsCountTest extends RevWalkTestCase {

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

		assertEquals(1, count(b, a));
	}

	@Test
	public void shouldReturnZeroOnSameCommit() throws Exception {
		final RevCommit c1 = commit(commit(commit()));
		assertEquals(0, count(c1, c1));
	}

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

		assertEquals(0, count(a, b));
	}

	@Test
	public void shouldWorkWithMerges() throws Exception {
		final RevCommit a = commit();
		final RevCommit b1 = commit(a);
		final RevCommit b2 = commit(a);
		final RevCommit c = commit(b1, b2);

		assertEquals(3, count(c, a));
	}

	@Test
	public void shouldWorkWithoutCommonAncestor() throws Exception {
		final RevCommit a1 = commit();
		final RevCommit a2 = commit();
		final RevCommit b = commit(a1);

		assertEquals(2, count(b, a2));
	}

	@Test
	public void shouldWorkWithZeroAsEnd() throws Exception {
		final RevCommit c = commit(commit());

		assertEquals(2, count(c, null));
	}

	private int count(RevCommit start, RevCommit end) throws Exception {
		return RevWalkUtils.count(rw, start, end);
	}
}
