org.eclipse.jgit.test/tst/org/eclipse/jgit/symlinks/SymlinksTest.java - jgit - Git at Google

 /*
  * Copyright (C) 2013, Axel Richard <axel.richard@obeo.fr>
  * 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.symlinks;

 import static org.junit.Assert.assertEquals;

 import java.io.File;
 import java.util.List;

 import org.eclipse.jgit.api.Git;
 import org.eclipse.jgit.diff.DiffEntry;
 import org.eclipse.jgit.junit.RepositoryTestCase;
 import org.eclipse.jgit.lib.FileMode;
 import org.eclipse.jgit.lib.Ref;
 import org.eclipse.jgit.revwalk.RevCommit;
 import org.eclipse.jgit.treewalk.FileTreeIterator;
 import org.eclipse.jgit.treewalk.FileTreeIterator.FileEntry;
 import org.eclipse.jgit.treewalk.TreeWalk;
 import org.eclipse.jgit.util.FS;
 import org.eclipse.jgit.util.FileUtils;
 import org.junit.Before;
 import org.junit.Test;

 public class SymlinksTest extends RepositoryTestCase {
 	@Before
 	public void beforeMethod() {
 		// If this assumption fails the tests are skipped. When running on a
 		// filesystem not supporting symlinks I don't want this tests
 		org.junit.Assume.assumeTrue(FS.DETECTED.supportsSymlinks());
 	}

 	/**
 	 * Steps: 1.Add file 'a' 2.Commit 3.Create branch '1' 4.Replace file 'a' by
 	 * symlink 'a' 5.Commit 6.Checkout branch '1'
 	 *
 	 * The working tree should contain 'a' with FileMode.REGULAR_FILE after the
 	 * checkout.
 	 *
 	 * @throws Exception
 	 */
 	@Test
 	public void fileModeTestFileThenSymlink() throws Exception {
 		try (Git git = new Git(db)) {
 			writeTrashFile("a", "Hello world a");
 			writeTrashFile("b", "Hello world b");
 			git.add().addFilepattern(".").call();
 			git.commit().setMessage("add files a & b").call();
 			Ref branch_1 = git.branchCreate().setName("branch_1").call();
 			git.rm().addFilepattern("a").call();
 			FileUtils.createSymLink(new File(db.getWorkTree(), "a"), "b");
 			git.add().addFilepattern("a").call();
 			git.commit().setMessage("add symlink a").call();

 			FileEntry entry = new FileTreeIterator.FileEntry(new File(
 					db.getWorkTree(), "a"), db.getFS());
 			assertEquals(FileMode.SYMLINK, entry.getMode());

 			git.checkout().setName(branch_1.getName()).call();

 			entry = new FileTreeIterator.FileEntry(new File(db.getWorkTree(), "a"),
 					db.getFS());
 			assertEquals(FileMode.REGULAR_FILE, entry.getMode());
 		}
 	}

 	/**
 	 * Steps: 1.Add symlink 'a' 2.Commit 3.Create branch '1' 4.Replace symlink
 	 * 'a' by file 'a' 5.Commit 6.Checkout branch '1'
 	 *
 	 * The working tree should contain 'a' with FileMode.SYMLINK after the
 	 * checkout.
 	 *
 	 * @throws Exception
 	 */
 	@Test
 	public void fileModeTestSymlinkThenFile() throws Exception {
 		try (Git git = new Git(db)) {
 			writeTrashFile("b", "Hello world b");
 			FileUtils.createSymLink(new File(db.getWorkTree(), "a"), "b");
 			git.add().addFilepattern(".").call();
 			git.commit().setMessage("add file b & symlink a").call();
 			Ref branch_1 = git.branchCreate().setName("branch_1").call();
 			git.rm().addFilepattern("a").call();
 			writeTrashFile("a", "Hello world a");
 			git.add().addFilepattern("a").call();
 			git.commit().setMessage("add file a").call();

 			FileEntry entry = new FileTreeIterator.FileEntry(new File(
 					db.getWorkTree(), "a"), db.getFS());
 			assertEquals(FileMode.REGULAR_FILE, entry.getMode());

 			git.checkout().setName(branch_1.getName()).call();

 			entry = new FileTreeIterator.FileEntry(new File(db.getWorkTree(), "a"),
 					db.getFS());
 			assertEquals(FileMode.SYMLINK, entry.getMode());
 		}
 	}

 	/**
 	 * Steps: 1.Add folder 'a' 2.Commit 3.Create branch '1' 4.Replace folder 'a'
 	 * by symlink 'a' 5.Commit 6.Checkout branch '1'
 	 *
 	 * The working tree should contain 'a' with FileMode.TREE after the
 	 * checkout.
 	 *
 	 * @throws Exception
 	 */
 	@Test
 	public void fileModeTestFolderThenSymlink() throws Exception {
 		try (Git git = new Git(db)) {
 			FileUtils.mkdirs(new File(db.getWorkTree(), "a"));
 			writeTrashFile("a/b", "Hello world b");
 			writeTrashFile("c", "Hello world c");
 			git.add().addFilepattern(".").call();
 			git.commit().setMessage("add folder a").call();
 			Ref branch_1 = git.branchCreate().setName("branch_1").call();
 			git.rm().addFilepattern("a").call();
 			FileUtils.createSymLink(new File(db.getWorkTree(), "a"), "c");
 			git.add().addFilepattern("a").call();
 			git.commit().setMessage("add symlink a").call();

 			FileEntry entry = new FileTreeIterator.FileEntry(new File(
 					db.getWorkTree(), "a"), db.getFS());
 			assertEquals(FileMode.SYMLINK, entry.getMode());

 			git.checkout().setName(branch_1.getName()).call();

 			entry = new FileTreeIterator.FileEntry(new File(db.getWorkTree(), "a"),
 					db.getFS());
 			assertEquals(FileMode.TREE, entry.getMode());
 		}
 	}

 	/**
 	 * Steps: 1.Add symlink 'a' 2.Commit 3.Create branch '1' 4.Replace symlink
 	 * 'a' by folder 'a' 5.Commit 6.Checkout branch '1'
 	 *
 	 * The working tree should contain 'a' with FileMode.SYMLINK after the
 	 * checkout.
 	 *
 	 * @throws Exception
 	 */
 	@Test
 	public void fileModeTestSymlinkThenFolder() throws Exception {
 		try (Git git = new Git(db)) {
 			writeTrashFile("c", "Hello world c");
 			FileUtils.createSymLink(new File(db.getWorkTree(), "a"), "c");
 			git.add().addFilepattern(".").call();
 			git.commit().setMessage("add symlink a").call();
 			Ref branch_1 = git.branchCreate().setName("branch_1").call();
 			git.rm().addFilepattern("a").call();
 			FileUtils.mkdirs(new File(db.getWorkTree(), "a"));
 			writeTrashFile("a/b", "Hello world b");
 			git.add().addFilepattern("a").call();
 			git.commit().setMessage("add folder a").call();

 			FileEntry entry = new FileTreeIterator.FileEntry(new File(
 					db.getWorkTree(), "a"), db.getFS());
 			assertEquals(FileMode.TREE, entry.getMode());

 			git.checkout().setName(branch_1.getName()).call();

 			entry = new FileTreeIterator.FileEntry(new File(db.getWorkTree(), "a"),
 					db.getFS());
 			assertEquals(FileMode.SYMLINK, entry.getMode());
 		}
 	}

 	/**
 	 * Steps: 1.Add file 'b' 2.Commit 3.Create branch '1' 4.Add symlink 'a'
 	 * 5.Commit 6.Checkout branch '1'
 	 *
 	 * The working tree should not contain 'a' -&gt; FileMode.MISSING after the
 	 * checkout.
 	 *
 	 * @throws Exception
 	 */
 	@Test
 	public void fileModeTestMissingThenSymlink() throws Exception {
 		try (Git git = new Git(db);
 				TreeWalk tw = new TreeWalk(db);) {
 			writeTrashFile("b", "Hello world b");
 			git.add().addFilepattern(".").call();
 			RevCommit commit1 = git.commit().setMessage("add file b").call();
 			Ref branch_1 = git.branchCreate().setName("branch_1").call();
 			FileUtils.createSymLink(new File(db.getWorkTree(), "a"), "b");
 			git.add().addFilepattern("a").call();
 			RevCommit commit2 = git.commit().setMessage("add symlink a").call();

 			git.checkout().setName(branch_1.getName()).call();

 			tw.addTree(commit1.getTree());
 			tw.addTree(commit2.getTree());
 			List<DiffEntry> scan = DiffEntry.scan(tw);
 			assertEquals(1, scan.size());
 			assertEquals(FileMode.SYMLINK, scan.get(0).getNewMode());
 			assertEquals(FileMode.MISSING, scan.get(0).getOldMode());
 		}
 	}

 	/**
 	 * Steps: 1.Add symlink 'a' 2.Commit 3.Create branch '1' 4.Delete symlink
 	 * 'a' 5.Commit 6.Checkout branch '1'
 	 *
 	 * The working tree should contain 'a' with FileMode.SYMLINK after the
 	 * checkout.
 	 *
 	 * @throws Exception
 	 */
 	@Test
 	public void fileModeTestSymlinkThenMissing() throws Exception {
 		try (Git git = new Git(db);
 				TreeWalk tw = new TreeWalk(db);) {
 			writeTrashFile("b", "Hello world b");
 			FileUtils.createSymLink(new File(db.getWorkTree(), "a"), "b");
 			git.add().addFilepattern(".").call();
 			RevCommit commit1 = git.commit().setMessage("add file b & symlink a")
 					.call();
 			Ref branch_1 = git.branchCreate().setName("branch_1").call();
 			git.rm().addFilepattern("a").call();
 			RevCommit commit2 = git.commit().setMessage("delete symlink a").call();

 			git.checkout().setName(branch_1.getName()).call();

 			tw.addTree(commit1.getTree());
 			tw.addTree(commit2.getTree());
 			List<DiffEntry> scan = DiffEntry.scan(tw);
 			assertEquals(1, scan.size());
 			assertEquals(FileMode.MISSING, scan.get(0).getNewMode());
 			assertEquals(FileMode.SYMLINK, scan.get(0).getOldMode());
 		}
 	}

 	@Test
 	public void createSymlinkAfterTarget() throws Exception {
 		try (Git git = new Git(db)) {
 			writeTrashFile("a", "start");
 			git.add().addFilepattern("a").call();
 			RevCommit base = git.commit().setMessage("init").call();
 			writeTrashFile("target", "someData");
 			FileUtils.createSymLink(new File(db.getWorkTree(), "link"), "target");
 			git.add().addFilepattern("target").addFilepattern("link").call();
 			git.commit().setMessage("add target").call();
 			assertEquals(4, db.getWorkTree().list().length); // self-check
 			git.checkout().setName(base.name()).call();
 			assertEquals(2, db.getWorkTree().list().length); // self-check
 			git.checkout().setName("master").call();
 			assertEquals(4, db.getWorkTree().list().length);
 			String data = read(new File(db.getWorkTree(), "target"));
 			assertEquals(8, new File(db.getWorkTree(), "target").length());
 			assertEquals("someData", data);
 			data = read(new File(db.getWorkTree(), "link"));
 			assertEquals("target",
 					FileUtils.readSymLink(new File(db.getWorkTree(), "link")));
 			assertEquals("someData", data);
 		}
 	}

 	@Test
 	public void createFileSymlinkBeforeTarget() throws Exception {
 		try (Git git = new Git(db)) {
 			writeTrashFile("a", "start");
 			git.add().addFilepattern("a").call();
 			RevCommit base = git.commit().setMessage("init").call();
 			writeTrashFile("target", "someData");
 			FileUtils.createSymLink(new File(db.getWorkTree(), "tlink"), "target");
 			git.add().addFilepattern("target").addFilepattern("tlink").call();
 			git.commit().setMessage("add target").call();
 			assertEquals(4, db.getWorkTree().list().length); // self-check
 			git.checkout().setName(base.name()).call();
 			assertEquals(2, db.getWorkTree().list().length); // self-check
 			git.checkout().setName("master").call();
 			assertEquals(4, db.getWorkTree().list().length);
 			String data = read(new File(db.getWorkTree(), "target"));
 			assertEquals(8, new File(db.getWorkTree(), "target").length());
 			assertEquals("someData", data);
 			data = read(new File(db.getWorkTree(), "tlink"));
 			assertEquals("target",
 					FileUtils.readSymLink(new File(db.getWorkTree(), "tlink")));
 			assertEquals("someData", data);
 		}
 	}

 	@Test
 	public void createDirSymlinkBeforeTarget() throws Exception {
 		try (Git git = new Git(db)) {
 			writeTrashFile("a", "start");
 			git.add().addFilepattern("a").call();
 			RevCommit base = git.commit().setMessage("init").call();
 			FileUtils.createSymLink(new File(db.getWorkTree(), "link"), "target");
 			FileUtils.mkdir(new File(db.getWorkTree(), "target"));
 			writeTrashFile("target/file", "someData");
 			git.add().addFilepattern("target").addFilepattern("link").call();
 			git.commit().setMessage("add target").call();
 			assertEquals(4, db.getWorkTree().list().length); // self-check
 			git.checkout().setName(base.name()).call();
 			assertEquals(2, db.getWorkTree().list().length); // self-check
 			git.checkout().setName("master").call();
 			assertEquals(4, db.getWorkTree().list().length);
 			String data = read(new File(db.getWorkTree(), "target/file"));
 			assertEquals(8, new File(db.getWorkTree(), "target/file").length());
 			assertEquals("someData", data);
 			data = read(new File(db.getWorkTree(), "link/file"));
 			assertEquals("target",
 					FileUtils.readSymLink(new File(db.getWorkTree(), "link")));
 			assertEquals("someData", data);
 		}
 	}
 }
	/*
	* Copyright (C) 2013, Axel Richard <axel.richard@obeo.fr>
	* 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.symlinks;

	import static org.junit.Assert.assertEquals;

	import java.io.File;
	import java.util.List;

	import org.eclipse.jgit.api.Git;
	import org.eclipse.jgit.diff.DiffEntry;
	import org.eclipse.jgit.junit.RepositoryTestCase;
	import org.eclipse.jgit.lib.FileMode;
	import org.eclipse.jgit.lib.Ref;
	import org.eclipse.jgit.revwalk.RevCommit;
	import org.eclipse.jgit.treewalk.FileTreeIterator;
	import org.eclipse.jgit.treewalk.FileTreeIterator.FileEntry;
	import org.eclipse.jgit.treewalk.TreeWalk;
	import org.eclipse.jgit.util.FS;
	import org.eclipse.jgit.util.FileUtils;
	import org.junit.Before;
	import org.junit.Test;

	public class SymlinksTest extends RepositoryTestCase {
	@Before
	public void beforeMethod() {
	// If this assumption fails the tests are skipped. When running on a
	// filesystem not supporting symlinks I don't want this tests
	org.junit.Assume.assumeTrue(FS.DETECTED.supportsSymlinks());
	}

	/**
	* Steps: 1.Add file 'a' 2.Commit 3.Create branch '1' 4.Replace file 'a' by
	* symlink 'a' 5.Commit 6.Checkout branch '1'
	*
	* The working tree should contain 'a' with FileMode.REGULAR_FILE after the
	* checkout.
	*
	* @throws Exception
	*/
	@Test
	public void fileModeTestFileThenSymlink() throws Exception {
	try (Git git = new Git(db)) {
	writeTrashFile("a", "Hello world a");
	writeTrashFile("b", "Hello world b");
	git.add().addFilepattern(".").call();
	git.commit().setMessage("add files a & b").call();
	Ref branch_1 = git.branchCreate().setName("branch_1").call();
	git.rm().addFilepattern("a").call();
	FileUtils.createSymLink(new File(db.getWorkTree(), "a"), "b");
	git.add().addFilepattern("a").call();
	git.commit().setMessage("add symlink a").call();

	FileEntry entry = new FileTreeIterator.FileEntry(new File(
	db.getWorkTree(), "a"), db.getFS());
	assertEquals(FileMode.SYMLINK, entry.getMode());

	git.checkout().setName(branch_1.getName()).call();

	entry = new FileTreeIterator.FileEntry(new File(db.getWorkTree(), "a"),
	db.getFS());
	assertEquals(FileMode.REGULAR_FILE, entry.getMode());
	}
	}

	/**
	* Steps: 1.Add symlink 'a' 2.Commit 3.Create branch '1' 4.Replace symlink
	* 'a' by file 'a' 5.Commit 6.Checkout branch '1'
	*
	* The working tree should contain 'a' with FileMode.SYMLINK after the
	* checkout.
	*
	* @throws Exception
	*/
	@Test
	public void fileModeTestSymlinkThenFile() throws Exception {
	try (Git git = new Git(db)) {
	writeTrashFile("b", "Hello world b");
	FileUtils.createSymLink(new File(db.getWorkTree(), "a"), "b");
	git.add().addFilepattern(".").call();
	git.commit().setMessage("add file b & symlink a").call();
	Ref branch_1 = git.branchCreate().setName("branch_1").call();
	git.rm().addFilepattern("a").call();
	writeTrashFile("a", "Hello world a");
	git.add().addFilepattern("a").call();
	git.commit().setMessage("add file a").call();

	FileEntry entry = new FileTreeIterator.FileEntry(new File(
	db.getWorkTree(), "a"), db.getFS());
	assertEquals(FileMode.REGULAR_FILE, entry.getMode());

	git.checkout().setName(branch_1.getName()).call();

	entry = new FileTreeIterator.FileEntry(new File(db.getWorkTree(), "a"),
	db.getFS());
	assertEquals(FileMode.SYMLINK, entry.getMode());
	}
	}

	/**
	* Steps: 1.Add folder 'a' 2.Commit 3.Create branch '1' 4.Replace folder 'a'
	* by symlink 'a' 5.Commit 6.Checkout branch '1'
	*
	* The working tree should contain 'a' with FileMode.TREE after the
	* checkout.
	*
	* @throws Exception
	*/
	@Test
	public void fileModeTestFolderThenSymlink() throws Exception {
	try (Git git = new Git(db)) {
	FileUtils.mkdirs(new File(db.getWorkTree(), "a"));
	writeTrashFile("a/b", "Hello world b");
	writeTrashFile("c", "Hello world c");
	git.add().addFilepattern(".").call();
	git.commit().setMessage("add folder a").call();
	Ref branch_1 = git.branchCreate().setName("branch_1").call();
	git.rm().addFilepattern("a").call();
	FileUtils.createSymLink(new File(db.getWorkTree(), "a"), "c");
	git.add().addFilepattern("a").call();
	git.commit().setMessage("add symlink a").call();

	FileEntry entry = new FileTreeIterator.FileEntry(new File(
	db.getWorkTree(), "a"), db.getFS());
	assertEquals(FileMode.SYMLINK, entry.getMode());

	git.checkout().setName(branch_1.getName()).call();

	entry = new FileTreeIterator.FileEntry(new File(db.getWorkTree(), "a"),
	db.getFS());
	assertEquals(FileMode.TREE, entry.getMode());
	}
	}

	/**
	* Steps: 1.Add symlink 'a' 2.Commit 3.Create branch '1' 4.Replace symlink
	* 'a' by folder 'a' 5.Commit 6.Checkout branch '1'
	*
	* The working tree should contain 'a' with FileMode.SYMLINK after the
	* checkout.
	*
	* @throws Exception
	*/
	@Test
	public void fileModeTestSymlinkThenFolder() throws Exception {
	try (Git git = new Git(db)) {
	writeTrashFile("c", "Hello world c");
	FileUtils.createSymLink(new File(db.getWorkTree(), "a"), "c");
	git.add().addFilepattern(".").call();
	git.commit().setMessage("add symlink a").call();
	Ref branch_1 = git.branchCreate().setName("branch_1").call();
	git.rm().addFilepattern("a").call();
	FileUtils.mkdirs(new File(db.getWorkTree(), "a"));
	writeTrashFile("a/b", "Hello world b");
	git.add().addFilepattern("a").call();
	git.commit().setMessage("add folder a").call();

	FileEntry entry = new FileTreeIterator.FileEntry(new File(
	db.getWorkTree(), "a"), db.getFS());
	assertEquals(FileMode.TREE, entry.getMode());

	git.checkout().setName(branch_1.getName()).call();

	entry = new FileTreeIterator.FileEntry(new File(db.getWorkTree(), "a"),
	db.getFS());
	assertEquals(FileMode.SYMLINK, entry.getMode());
	}
	}

	/**
	* Steps: 1.Add file 'b' 2.Commit 3.Create branch '1' 4.Add symlink 'a'
	* 5.Commit 6.Checkout branch '1'
	*
	* The working tree should not contain 'a' -> FileMode.MISSING after the
	* checkout.
	*
	* @throws Exception
	*/
	@Test
	public void fileModeTestMissingThenSymlink() throws Exception {
	try (Git git = new Git(db);
	TreeWalk tw = new TreeWalk(db);) {
	writeTrashFile("b", "Hello world b");
	git.add().addFilepattern(".").call();
	RevCommit commit1 = git.commit().setMessage("add file b").call();
	Ref branch_1 = git.branchCreate().setName("branch_1").call();
	FileUtils.createSymLink(new File(db.getWorkTree(), "a"), "b");
	git.add().addFilepattern("a").call();
	RevCommit commit2 = git.commit().setMessage("add symlink a").call();

	git.checkout().setName(branch_1.getName()).call();

	tw.addTree(commit1.getTree());
	tw.addTree(commit2.getTree());
	List<DiffEntry> scan = DiffEntry.scan(tw);
	assertEquals(1, scan.size());
	assertEquals(FileMode.SYMLINK, scan.get(0).getNewMode());
	assertEquals(FileMode.MISSING, scan.get(0).getOldMode());
	}
	}

	/**
	* Steps: 1.Add symlink 'a' 2.Commit 3.Create branch '1' 4.Delete symlink
	* 'a' 5.Commit 6.Checkout branch '1'
	*
	* The working tree should contain 'a' with FileMode.SYMLINK after the
	* checkout.
	*
	* @throws Exception
	*/
	@Test
	public void fileModeTestSymlinkThenMissing() throws Exception {
	try (Git git = new Git(db);
	TreeWalk tw = new TreeWalk(db);) {
	writeTrashFile("b", "Hello world b");
	FileUtils.createSymLink(new File(db.getWorkTree(), "a"), "b");
	git.add().addFilepattern(".").call();
	RevCommit commit1 = git.commit().setMessage("add file b & symlink a")
	.call();
	Ref branch_1 = git.branchCreate().setName("branch_1").call();
	git.rm().addFilepattern("a").call();
	RevCommit commit2 = git.commit().setMessage("delete symlink a").call();

	git.checkout().setName(branch_1.getName()).call();

	tw.addTree(commit1.getTree());
	tw.addTree(commit2.getTree());
	List<DiffEntry> scan = DiffEntry.scan(tw);
	assertEquals(1, scan.size());
	assertEquals(FileMode.MISSING, scan.get(0).getNewMode());
	assertEquals(FileMode.SYMLINK, scan.get(0).getOldMode());
	}
	}

	@Test
	public void createSymlinkAfterTarget() throws Exception {
	try (Git git = new Git(db)) {
	writeTrashFile("a", "start");
	git.add().addFilepattern("a").call();
	RevCommit base = git.commit().setMessage("init").call();
	writeTrashFile("target", "someData");
	FileUtils.createSymLink(new File(db.getWorkTree(), "link"), "target");
	git.add().addFilepattern("target").addFilepattern("link").call();
	git.commit().setMessage("add target").call();
	assertEquals(4, db.getWorkTree().list().length); // self-check
	git.checkout().setName(base.name()).call();
	assertEquals(2, db.getWorkTree().list().length); // self-check
	git.checkout().setName("master").call();
	assertEquals(4, db.getWorkTree().list().length);
	String data = read(new File(db.getWorkTree(), "target"));
	assertEquals(8, new File(db.getWorkTree(), "target").length());
	assertEquals("someData", data);
	data = read(new File(db.getWorkTree(), "link"));
	assertEquals("target",
	FileUtils.readSymLink(new File(db.getWorkTree(), "link")));
	assertEquals("someData", data);
	}
	}

	@Test
	public void createFileSymlinkBeforeTarget() throws Exception {
	try (Git git = new Git(db)) {
	writeTrashFile("a", "start");
	git.add().addFilepattern("a").call();
	RevCommit base = git.commit().setMessage("init").call();
	writeTrashFile("target", "someData");
	FileUtils.createSymLink(new File(db.getWorkTree(), "tlink"), "target");
	git.add().addFilepattern("target").addFilepattern("tlink").call();
	git.commit().setMessage("add target").call();
	assertEquals(4, db.getWorkTree().list().length); // self-check
	git.checkout().setName(base.name()).call();
	assertEquals(2, db.getWorkTree().list().length); // self-check
	git.checkout().setName("master").call();
	assertEquals(4, db.getWorkTree().list().length);
	String data = read(new File(db.getWorkTree(), "target"));
	assertEquals(8, new File(db.getWorkTree(), "target").length());
	assertEquals("someData", data);
	data = read(new File(db.getWorkTree(), "tlink"));
	assertEquals("target",
	FileUtils.readSymLink(new File(db.getWorkTree(), "tlink")));
	assertEquals("someData", data);
	}
	}

	@Test
	public void createDirSymlinkBeforeTarget() throws Exception {
	try (Git git = new Git(db)) {
	writeTrashFile("a", "start");
	git.add().addFilepattern("a").call();
	RevCommit base = git.commit().setMessage("init").call();
	FileUtils.createSymLink(new File(db.getWorkTree(), "link"), "target");
	FileUtils.mkdir(new File(db.getWorkTree(), "target"));
	writeTrashFile("target/file", "someData");
	git.add().addFilepattern("target").addFilepattern("link").call();
	git.commit().setMessage("add target").call();
	assertEquals(4, db.getWorkTree().list().length); // self-check
	git.checkout().setName(base.name()).call();
	assertEquals(2, db.getWorkTree().list().length); // self-check
	git.checkout().setName("master").call();
	assertEquals(4, db.getWorkTree().list().length);
	String data = read(new File(db.getWorkTree(), "target/file"));
	assertEquals(8, new File(db.getWorkTree(), "target/file").length());
	assertEquals("someData", data);
	data = read(new File(db.getWorkTree(), "link/file"));
	assertEquals("target",
	FileUtils.readSymLink(new File(db.getWorkTree(), "link")));
	assertEquals("someData", data);
	}
	}
	}