/*
    * Copyright (C) 2011, Robin Stocker <robin@nibor.org> and others
    *
    * This program and the accompanying materials are made available under the
    * terms of the Eclipse Distribution License v. 1.0 which is available at
    * https://www.eclipse.org/org/documents/edl-v10.php.
    *
    * SPDX-License-Identifier: BSD-3-Clause
    */
  
  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);
  	}
  }