org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/ReflogReaderTest.java - sop/jgit - Git at Google

 /*
  * Copyright (C) 2009, Robin Rosenberg
  * Copyright (C) 2009, Robin Rosenberg <robin.rosenberg@dewire.com>
  * 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.internal.storage.file;

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

 import java.io.File;
 import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.text.SimpleDateFormat;
 import java.util.List;

 import org.eclipse.jgit.lib.CheckoutEntry;
 import org.eclipse.jgit.lib.Constants;
 import org.eclipse.jgit.lib.ObjectId;
 import org.eclipse.jgit.lib.PersonIdent;
 import org.eclipse.jgit.lib.ReflogEntry;
 import org.eclipse.jgit.lib.ReflogReader;
 import org.eclipse.jgit.test.resources.SampleDataRepositoryTestCase;
 import org.junit.Test;

 public class ReflogReaderTest extends SampleDataRepositoryTestCase {

 	static byte[] oneLine = "da85355dfc525c9f6f3927b876f379f46ccf826e 3e7549db262d1e836d9bf0af7e22355468f1717c A O Thor Too <authortoo@wri.tr> 1243028200 +0200\tcommit: Add a toString for debugging to RemoteRefUpdate\n"
 			.getBytes();

 	static byte[] twoLine = ("0000000000000000000000000000000000000000 c6734895958052a9dbc396cff4459dc1a25029ab A U Thor <thor@committer.au> 1243028201 -0100\tbranch: Created from rr/renamebranchv4\n"
 			+ "c6734895958052a9dbc396cff4459dc1a25029ab 54794942a18a237c57a80719afed44bb78172b10 Same A U Thor <same.author@example.com> 1243028202 +0100\trebase finished: refs/heads/rr/renamebranch5 onto c6e3b9fe2da0293f11eae202ec35fb343191a82d\n")
 			.getBytes();

 	static byte[] twoLineWithAppendInProgress = ("0000000000000000000000000000000000000000 c6734895958052a9dbc396cff4459dc1a25029ab A U Thor <thor@committer.au> 1243028201 -0100\tbranch: Created from rr/renamebranchv4\n"
 			+ "c6734895958052a9dbc396cff4459dc1a25029ab 54794942a18a237c57a80719afed44bb78172b10 Same A U Thor <same.author@example.com> 1243028202 +0100\trebase finished: refs/heads/rr/renamebranch5 onto c6e3b9fe2da0293f11eae202ec35fb343191a82d\n"
 			+ "54794942a18a237c57a80719afed44bb78172b10 ")
 			.getBytes();

 	static byte[] aLine = "1111111111111111111111111111111111111111 3e7549db262d1e836d9bf0af7e22355468f1717c A U Thor <thor@committer.au> 1243028201 -0100\tbranch: change to a\n"
 			.getBytes();

 	static byte[] masterLine = "2222222222222222222222222222222222222222 3e7549db262d1e836d9bf0af7e22355468f1717c A U Thor <thor@committer.au> 1243028201 -0100\tbranch: change to master\n"
 			.getBytes();

 	static byte[] headLine = "3333333333333333333333333333333333333333 3e7549db262d1e836d9bf0af7e22355468f1717c A U Thor <thor@committer.au> 1243028201 -0100\tbranch: change to HEAD\n"
 			.getBytes();

 	static byte[] oneLineWithoutComment = "da85355dfc525c9f6f3927b876f379f46ccf826e 3e7549db262d1e836d9bf0af7e22355468f1717c A O Thor Too <authortoo@wri.tr> 1243028200 +0200\n"
 			.getBytes();

 	static byte[] switchBranch = "0d43a6890a19fd657faad1c4cfbe3cb1b47851c3 4809df9c0d8bce5b00955563f77c5a9f25aa0d12 A O Thor Too <authortoo@wri.tr> 1315088009 +0200\tcheckout: moving from new/work to master\n"
 			.getBytes();

 	@Test
 	public void testReadOneLine() throws Exception {
 		setupReflog("logs/refs/heads/master", oneLine);

 		ReflogReader reader = new ReflogReaderImpl(db, "refs/heads/master");
 		ReflogEntry e = reader.getLastEntry();
 		assertEquals(ObjectId
 				.fromString("da85355dfc525c9f6f3927b876f379f46ccf826e"), e
 				.getOldId());
 		assertEquals(ObjectId
 				.fromString("3e7549db262d1e836d9bf0af7e22355468f1717c"), e
 				.getNewId());
 		assertEquals("A O Thor Too", e.getWho().getName());
 		assertEquals("authortoo@wri.tr", e.getWho().getEmailAddress());
 		assertEquals(120, e.getWho().getTimeZoneOffset());
 		assertEquals("2009-05-22T23:36:40", iso(e.getWho()));
 		assertEquals("commit: Add a toString for debugging to RemoteRefUpdate",
 				e.getComment());
 	}

 	private static String iso(PersonIdent id) {
 		final SimpleDateFormat fmt;
 		fmt = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
 		fmt.setTimeZone(id.getTimeZone());
 		return fmt.format(id.getWhen());
 	}

 	@Test
 	public void testReadTwoLine() throws Exception {
 		setupReflog("logs/refs/heads/master", twoLine);

 		ReflogReader reader = new ReflogReaderImpl(db, "refs/heads/master");
 		List<ReflogEntry> reverseEntries = reader.getReverseEntries();
 		assertEquals(2, reverseEntries.size());
 		ReflogEntry e = reverseEntries.get(0);
 		assertEquals(ObjectId
 				.fromString("c6734895958052a9dbc396cff4459dc1a25029ab"), e
 				.getOldId());
 		assertEquals(ObjectId
 				.fromString("54794942a18a237c57a80719afed44bb78172b10"), e
 				.getNewId());
 		assertEquals("Same A U Thor", e.getWho().getName());
 		assertEquals("same.author@example.com", e.getWho().getEmailAddress());
 		assertEquals(60, e.getWho().getTimeZoneOffset());
 		assertEquals("2009-05-22T22:36:42", iso(e.getWho()));
 		assertEquals(
 				"rebase finished: refs/heads/rr/renamebranch5 onto c6e3b9fe2da0293f11eae202ec35fb343191a82d",
 				e.getComment());

 		e = reverseEntries.get(1);
 		assertEquals(ObjectId
 				.fromString("0000000000000000000000000000000000000000"), e
 				.getOldId());
 		assertEquals(ObjectId
 				.fromString("c6734895958052a9dbc396cff4459dc1a25029ab"), e
 				.getNewId());
 		assertEquals("A U Thor", e.getWho().getName());
 		assertEquals("thor@committer.au", e.getWho().getEmailAddress());
 		assertEquals(-60, e.getWho().getTimeZoneOffset());
 		assertEquals("2009-05-22T20:36:41", iso(e.getWho()));
 		assertEquals("branch: Created from rr/renamebranchv4", e.getComment());
 	}

 	@Test
 	public void testReadWhileAppendIsInProgress() throws Exception {
 		setupReflog("logs/refs/heads/master", twoLineWithAppendInProgress);
 		ReflogReader reader = new ReflogReaderImpl(db, "refs/heads/master");
 		List<ReflogEntry> reverseEntries = reader.getReverseEntries();
 		assertEquals(2, reverseEntries.size());
 		ReflogEntry e = reverseEntries.get(0);
 		assertEquals(ObjectId
 				.fromString("c6734895958052a9dbc396cff4459dc1a25029ab"), e
 				.getOldId());
 		assertEquals(ObjectId
 				.fromString("54794942a18a237c57a80719afed44bb78172b10"), e
 				.getNewId());
 		assertEquals("Same A U Thor", e.getWho().getName());
 		assertEquals("same.author@example.com", e.getWho().getEmailAddress());
 		assertEquals(60, e.getWho().getTimeZoneOffset());
 		assertEquals("2009-05-22T22:36:42", iso(e.getWho()));
 		assertEquals(
 				"rebase finished: refs/heads/rr/renamebranch5 onto c6e3b9fe2da0293f11eae202ec35fb343191a82d",
 				e.getComment());
 		// while similar to testReadTwoLine, we can assume that if we get the last entry
 		// right, everything else is too
 	}


 	@Test
 	public void testReadRightLog() throws Exception {
 		setupReflog("logs/refs/heads/a", aLine);
 		setupReflog("logs/refs/heads/master", masterLine);
 		setupReflog("logs/HEAD", headLine);
 		assertEquals("branch: change to master", db.getReflogReader("master")
 				.getLastEntry().getComment());
 		assertEquals("branch: change to a", db.getReflogReader("a")
 				.getLastEntry().getComment());
 		assertEquals("branch: change to HEAD", db.getReflogReader("HEAD")
 				.getLastEntry().getComment());
 	}

 	@Test
 	public void testReadLineWithMissingComment() throws Exception {
 		setupReflog("logs/refs/heads/master", oneLineWithoutComment);
 		final ReflogReader reader = db.getReflogReader("master");
 		ReflogEntry e = reader.getLastEntry();
 		assertEquals(ObjectId
 				.fromString("da85355dfc525c9f6f3927b876f379f46ccf826e"), e
 				.getOldId());
 		assertEquals(ObjectId
 				.fromString("3e7549db262d1e836d9bf0af7e22355468f1717c"), e
 				.getNewId());
 		assertEquals("A O Thor Too", e.getWho().getName());
 		assertEquals("authortoo@wri.tr", e.getWho().getEmailAddress());
 		assertEquals(120, e.getWho().getTimeZoneOffset());
 		assertEquals("2009-05-22T23:36:40", iso(e.getWho()));
 		assertEquals("",
 				e.getComment());
 	}

 	@Test
 	public void testNoLog() throws Exception {
 		assertEquals(0, db.getReflogReader("master").getReverseEntries().size());
 		assertNull(db.getReflogReader("master").getLastEntry());
 	}

 	@Test
 	public void testCheckout() throws Exception {
 		setupReflog("logs/HEAD", switchBranch);
 		List<ReflogEntry> entries = db.getReflogReader(Constants.HEAD)
 				.getReverseEntries();
 		assertEquals(1, entries.size());
 		ReflogEntry entry = entries.get(0);
 		CheckoutEntry checkout = entry.parseCheckout();
 		assertNotNull(checkout);
 		assertEquals("master", checkout.getToBranch());
 		assertEquals("new/work", checkout.getFromBranch());
 	}

 	@Test
 	public void testSpecificEntryNumber() throws Exception {
 		setupReflog("logs/refs/heads/master", twoLine);

 		ReflogReader reader = new ReflogReaderImpl(db, "refs/heads/master");
 		ReflogEntry e = reader.getReverseEntry(0);
 		assertEquals(
 				ObjectId.fromString("c6734895958052a9dbc396cff4459dc1a25029ab"),
 				e.getOldId());
 		assertEquals(
 				ObjectId.fromString("54794942a18a237c57a80719afed44bb78172b10"),
 				e.getNewId());
 		assertEquals("Same A U Thor", e.getWho().getName());
 		assertEquals("same.author@example.com", e.getWho().getEmailAddress());
 		assertEquals(60, e.getWho().getTimeZoneOffset());
 		assertEquals("2009-05-22T22:36:42", iso(e.getWho()));
 		assertEquals(
 				"rebase finished: refs/heads/rr/renamebranch5 onto c6e3b9fe2da0293f11eae202ec35fb343191a82d",
 				e.getComment());

 		e = reader.getReverseEntry(1);
 		assertEquals(
 				ObjectId.fromString("0000000000000000000000000000000000000000"),
 				e.getOldId());
 		assertEquals(
 				ObjectId.fromString("c6734895958052a9dbc396cff4459dc1a25029ab"),
 				e.getNewId());
 		assertEquals("A U Thor", e.getWho().getName());
 		assertEquals("thor@committer.au", e.getWho().getEmailAddress());
 		assertEquals(-60, e.getWho().getTimeZoneOffset());
 		assertEquals("2009-05-22T20:36:41", iso(e.getWho()));
 		assertEquals("branch: Created from rr/renamebranchv4", e.getComment());

 		assertNull(reader.getReverseEntry(3));
 	}

 	private void setupReflog(String logName, byte[] data)
 			throws FileNotFoundException, IOException {
 				File logfile = new File(db.getDirectory(), logName);
 				if (!logfile.getParentFile().mkdirs()
 						&& !logfile.getParentFile().isDirectory()) {
 					throw new IOException(
 							"oops, cannot create the directory for the test reflog file"
 									+ logfile);
 				}
 				FileOutputStream fileOutputStream = new FileOutputStream(logfile);
 				try {
 					fileOutputStream.write(data);
 				} finally {
 					fileOutputStream.close();
 				}
 			}

 }
	/*
	* Copyright (C) 2009, Robin Rosenberg
	* Copyright (C) 2009, Robin Rosenberg <robin.rosenberg@dewire.com>
	* 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.internal.storage.file;

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

	import java.io.File;
	import java.io.FileNotFoundException;
	import java.io.FileOutputStream;
	import java.io.IOException;
	import java.text.SimpleDateFormat;
	import java.util.List;

	import org.eclipse.jgit.lib.CheckoutEntry;
	import org.eclipse.jgit.lib.Constants;
	import org.eclipse.jgit.lib.ObjectId;
	import org.eclipse.jgit.lib.PersonIdent;
	import org.eclipse.jgit.lib.ReflogEntry;
	import org.eclipse.jgit.lib.ReflogReader;
	import org.eclipse.jgit.test.resources.SampleDataRepositoryTestCase;
	import org.junit.Test;

	public class ReflogReaderTest extends SampleDataRepositoryTestCase {

	static byte[] oneLine = "da85355dfc525c9f6f3927b876f379f46ccf826e 3e7549db262d1e836d9bf0af7e22355468f1717c A O Thor Too <authortoo@wri.tr> 1243028200 +0200\tcommit: Add a toString for debugging to RemoteRefUpdate\n"
	.getBytes();

	static byte[] twoLine = ("0000000000000000000000000000000000000000 c6734895958052a9dbc396cff4459dc1a25029ab A U Thor <thor@committer.au> 1243028201 -0100\tbranch: Created from rr/renamebranchv4\n"
	+ "c6734895958052a9dbc396cff4459dc1a25029ab 54794942a18a237c57a80719afed44bb78172b10 Same A U Thor <same.author@example.com> 1243028202 +0100\trebase finished: refs/heads/rr/renamebranch5 onto c6e3b9fe2da0293f11eae202ec35fb343191a82d\n")
	.getBytes();

	static byte[] twoLineWithAppendInProgress = ("0000000000000000000000000000000000000000 c6734895958052a9dbc396cff4459dc1a25029ab A U Thor <thor@committer.au> 1243028201 -0100\tbranch: Created from rr/renamebranchv4\n"
	+ "c6734895958052a9dbc396cff4459dc1a25029ab 54794942a18a237c57a80719afed44bb78172b10 Same A U Thor <same.author@example.com> 1243028202 +0100\trebase finished: refs/heads/rr/renamebranch5 onto c6e3b9fe2da0293f11eae202ec35fb343191a82d\n"
	+ "54794942a18a237c57a80719afed44bb78172b10 ")
	.getBytes();

	static byte[] aLine = "1111111111111111111111111111111111111111 3e7549db262d1e836d9bf0af7e22355468f1717c A U Thor <thor@committer.au> 1243028201 -0100\tbranch: change to a\n"
	.getBytes();

	static byte[] masterLine = "2222222222222222222222222222222222222222 3e7549db262d1e836d9bf0af7e22355468f1717c A U Thor <thor@committer.au> 1243028201 -0100\tbranch: change to master\n"
	.getBytes();

	static byte[] headLine = "3333333333333333333333333333333333333333 3e7549db262d1e836d9bf0af7e22355468f1717c A U Thor <thor@committer.au> 1243028201 -0100\tbranch: change to HEAD\n"
	.getBytes();

	static byte[] oneLineWithoutComment = "da85355dfc525c9f6f3927b876f379f46ccf826e 3e7549db262d1e836d9bf0af7e22355468f1717c A O Thor Too <authortoo@wri.tr> 1243028200 +0200\n"
	.getBytes();

	static byte[] switchBranch = "0d43a6890a19fd657faad1c4cfbe3cb1b47851c3 4809df9c0d8bce5b00955563f77c5a9f25aa0d12 A O Thor Too <authortoo@wri.tr> 1315088009 +0200\tcheckout: moving from new/work to master\n"
	.getBytes();

	@Test
	public void testReadOneLine() throws Exception {
	setupReflog("logs/refs/heads/master", oneLine);

	ReflogReader reader = new ReflogReaderImpl(db, "refs/heads/master");
	ReflogEntry e = reader.getLastEntry();
	assertEquals(ObjectId
	.fromString("da85355dfc525c9f6f3927b876f379f46ccf826e"), e
	.getOldId());
	assertEquals(ObjectId
	.fromString("3e7549db262d1e836d9bf0af7e22355468f1717c"), e
	.getNewId());
	assertEquals("A O Thor Too", e.getWho().getName());
	assertEquals("authortoo@wri.tr", e.getWho().getEmailAddress());
	assertEquals(120, e.getWho().getTimeZoneOffset());
	assertEquals("2009-05-22T23:36:40", iso(e.getWho()));
	assertEquals("commit: Add a toString for debugging to RemoteRefUpdate",
	e.getComment());
	}

	private static String iso(PersonIdent id) {
	final SimpleDateFormat fmt;
	fmt = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
	fmt.setTimeZone(id.getTimeZone());
	return fmt.format(id.getWhen());
	}

	@Test
	public void testReadTwoLine() throws Exception {
	setupReflog("logs/refs/heads/master", twoLine);

	ReflogReader reader = new ReflogReaderImpl(db, "refs/heads/master");
	List<ReflogEntry> reverseEntries = reader.getReverseEntries();
	assertEquals(2, reverseEntries.size());
	ReflogEntry e = reverseEntries.get(0);
	assertEquals(ObjectId
	.fromString("c6734895958052a9dbc396cff4459dc1a25029ab"), e
	.getOldId());
	assertEquals(ObjectId
	.fromString("54794942a18a237c57a80719afed44bb78172b10"), e
	.getNewId());
	assertEquals("Same A U Thor", e.getWho().getName());
	assertEquals("same.author@example.com", e.getWho().getEmailAddress());
	assertEquals(60, e.getWho().getTimeZoneOffset());
	assertEquals("2009-05-22T22:36:42", iso(e.getWho()));
	assertEquals(
	"rebase finished: refs/heads/rr/renamebranch5 onto c6e3b9fe2da0293f11eae202ec35fb343191a82d",
	e.getComment());

	e = reverseEntries.get(1);
	assertEquals(ObjectId
	.fromString("0000000000000000000000000000000000000000"), e
	.getOldId());
	assertEquals(ObjectId
	.fromString("c6734895958052a9dbc396cff4459dc1a25029ab"), e
	.getNewId());
	assertEquals("A U Thor", e.getWho().getName());
	assertEquals("thor@committer.au", e.getWho().getEmailAddress());
	assertEquals(-60, e.getWho().getTimeZoneOffset());
	assertEquals("2009-05-22T20:36:41", iso(e.getWho()));
	assertEquals("branch: Created from rr/renamebranchv4", e.getComment());
	}

	@Test
	public void testReadWhileAppendIsInProgress() throws Exception {
	setupReflog("logs/refs/heads/master", twoLineWithAppendInProgress);
	ReflogReader reader = new ReflogReaderImpl(db, "refs/heads/master");
	List<ReflogEntry> reverseEntries = reader.getReverseEntries();
	assertEquals(2, reverseEntries.size());
	ReflogEntry e = reverseEntries.get(0);
	assertEquals(ObjectId
	.fromString("c6734895958052a9dbc396cff4459dc1a25029ab"), e
	.getOldId());
	assertEquals(ObjectId
	.fromString("54794942a18a237c57a80719afed44bb78172b10"), e
	.getNewId());
	assertEquals("Same A U Thor", e.getWho().getName());
	assertEquals("same.author@example.com", e.getWho().getEmailAddress());
	assertEquals(60, e.getWho().getTimeZoneOffset());
	assertEquals("2009-05-22T22:36:42", iso(e.getWho()));
	assertEquals(
	"rebase finished: refs/heads/rr/renamebranch5 onto c6e3b9fe2da0293f11eae202ec35fb343191a82d",
	e.getComment());
	// while similar to testReadTwoLine, we can assume that if we get the last entry
	// right, everything else is too
	}


	@Test
	public void testReadRightLog() throws Exception {
	setupReflog("logs/refs/heads/a", aLine);
	setupReflog("logs/refs/heads/master", masterLine);
	setupReflog("logs/HEAD", headLine);
	assertEquals("branch: change to master", db.getReflogReader("master")
	.getLastEntry().getComment());
	assertEquals("branch: change to a", db.getReflogReader("a")
	.getLastEntry().getComment());
	assertEquals("branch: change to HEAD", db.getReflogReader("HEAD")
	.getLastEntry().getComment());
	}

	@Test
	public void testReadLineWithMissingComment() throws Exception {
	setupReflog("logs/refs/heads/master", oneLineWithoutComment);
	final ReflogReader reader = db.getReflogReader("master");
	ReflogEntry e = reader.getLastEntry();
	assertEquals(ObjectId
	.fromString("da85355dfc525c9f6f3927b876f379f46ccf826e"), e
	.getOldId());
	assertEquals(ObjectId
	.fromString("3e7549db262d1e836d9bf0af7e22355468f1717c"), e
	.getNewId());
	assertEquals("A O Thor Too", e.getWho().getName());
	assertEquals("authortoo@wri.tr", e.getWho().getEmailAddress());
	assertEquals(120, e.getWho().getTimeZoneOffset());
	assertEquals("2009-05-22T23:36:40", iso(e.getWho()));
	assertEquals("",
	e.getComment());
	}

	@Test
	public void testNoLog() throws Exception {
	assertEquals(0, db.getReflogReader("master").getReverseEntries().size());
	assertNull(db.getReflogReader("master").getLastEntry());
	}

	@Test
	public void testCheckout() throws Exception {
	setupReflog("logs/HEAD", switchBranch);
	List<ReflogEntry> entries = db.getReflogReader(Constants.HEAD)
	.getReverseEntries();
	assertEquals(1, entries.size());
	ReflogEntry entry = entries.get(0);
	CheckoutEntry checkout = entry.parseCheckout();
	assertNotNull(checkout);
	assertEquals("master", checkout.getToBranch());
	assertEquals("new/work", checkout.getFromBranch());
	}

	@Test
	public void testSpecificEntryNumber() throws Exception {
	setupReflog("logs/refs/heads/master", twoLine);

	ReflogReader reader = new ReflogReaderImpl(db, "refs/heads/master");
	ReflogEntry e = reader.getReverseEntry(0);
	assertEquals(
	ObjectId.fromString("c6734895958052a9dbc396cff4459dc1a25029ab"),
	e.getOldId());
	assertEquals(
	ObjectId.fromString("54794942a18a237c57a80719afed44bb78172b10"),
	e.getNewId());
	assertEquals("Same A U Thor", e.getWho().getName());
	assertEquals("same.author@example.com", e.getWho().getEmailAddress());
	assertEquals(60, e.getWho().getTimeZoneOffset());
	assertEquals("2009-05-22T22:36:42", iso(e.getWho()));
	assertEquals(
	"rebase finished: refs/heads/rr/renamebranch5 onto c6e3b9fe2da0293f11eae202ec35fb343191a82d",
	e.getComment());

	e = reader.getReverseEntry(1);
	assertEquals(
	ObjectId.fromString("0000000000000000000000000000000000000000"),
	e.getOldId());
	assertEquals(
	ObjectId.fromString("c6734895958052a9dbc396cff4459dc1a25029ab"),
	e.getNewId());
	assertEquals("A U Thor", e.getWho().getName());
	assertEquals("thor@committer.au", e.getWho().getEmailAddress());
	assertEquals(-60, e.getWho().getTimeZoneOffset());
	assertEquals("2009-05-22T20:36:41", iso(e.getWho()));
	assertEquals("branch: Created from rr/renamebranchv4", e.getComment());

	assertNull(reader.getReverseEntry(3));
	}

	private void setupReflog(String logName, byte[] data)
	throws FileNotFoundException, IOException {
	File logfile = new File(db.getDirectory(), logName);
	if (!logfile.getParentFile().mkdirs()
	&& !logfile.getParentFile().isDirectory()) {
	throw new IOException(
	"oops, cannot create the directory for the test reflog file"
	+ logfile);
	}
	FileOutputStream fileOutputStream = new FileOutputStream(logfile);
	try {
	fileOutputStream.write(data);
	} finally {
	fileOutputStream.close();
	}
	}

	}