Remove reftree and ketch

This was experimental code and never used in production.

Change-Id: Ia3da7f2b82d9e365cec2ccf9397cbc47439cd150
Signed-off-by: Han-Wen Nienhuys <hanwen@google.com>
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

6 files changed, 1 insertions, 1065 deletions

diff --git a/org.eclipse.jgit.test/META-INF/MANIFEST.MF b/org.eclipse.jgit.test/META-INF/MANIFEST.MF
index 148456d1cf..a1239468db 100644
--- a/org.eclipse.jgit.test/META-INF/MANIFEST.MF
+++ b/org.eclipse.jgit.test/META-INF/MANIFEST.MF
@@ -39,7 +39,6 @@ Import-Package: com.googlecode.javaewah;version="[1.1.6,2.0.0)",
  org.eclipse.jgit.internal.storage.io;version="[5.11.0,5.12.0)",
  org.eclipse.jgit.internal.storage.pack;version="[5.11.0,5.12.0)",
  org.eclipse.jgit.internal.storage.reftable;version="[5.11.0,5.12.0)",
- org.eclipse.jgit.internal.storage.reftree;version="[5.11.0,5.12.0)",
  org.eclipse.jgit.internal.transport.connectivity;version="[5.11.0,5.12.0)",
  org.eclipse.jgit.internal.transport.http;version="[5.11.0,5.12.0)",
  org.eclipse.jgit.internal.transport.parser;version="[5.11.0,5.12.0)",
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/dfs/DfsPackDescriptionTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/dfs/DfsPackDescriptionTest.java
index 18cf117174..b2c8ad5e7f 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/dfs/DfsPackDescriptionTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/dfs/DfsPackDescriptionTest.java
@@ -13,7 +13,6 @@ package org.eclipse.jgit.internal.storage.dfs;
 import static org.eclipse.jgit.internal.storage.dfs.DfsObjDatabase.PackSource.COMPACT;
 import static org.eclipse.jgit.internal.storage.dfs.DfsObjDatabase.PackSource.GC;
 import static org.eclipse.jgit.internal.storage.dfs.DfsObjDatabase.PackSource.GC_REST;
-import static org.eclipse.jgit.internal.storage.dfs.DfsObjDatabase.PackSource.GC_TXN;
 import static org.eclipse.jgit.internal.storage.dfs.DfsObjDatabase.PackSource.INSERT;
 import static org.eclipse.jgit.internal.storage.dfs.DfsObjDatabase.PackSource.RECEIVE;
 import static org.eclipse.jgit.internal.storage.dfs.DfsObjDatabase.PackSource.UNREACHABLE_GARBAGE;
@@ -82,7 +81,7 @@ public final class DfsPackDescriptionTest {
 				DfsPackDescription.objectLookupComparator(
 					new PackSource.ComparatorBuilder()
 						.add(GC)
-						.add(INSERT, RECEIVE, GC_REST, GC_TXN, UNREACHABLE_GARBAGE)
+						.add(INSERT, RECEIVE, GC_REST, UNREACHABLE_GARBAGE)
 						.add(COMPACT)
 						.build()),
 				a, b);
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/dfs/PackSourceTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/dfs/PackSourceTest.java
index 6fcd4ac051..dfd112976c 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/dfs/PackSourceTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/dfs/PackSourceTest.java
@@ -14,7 +14,6 @@ import static org.eclipse.jgit.internal.storage.dfs.DfsObjDatabase.PackSource.CO
 import static org.eclipse.jgit.internal.storage.dfs.DfsObjDatabase.PackSource.DEFAULT_COMPARATOR;
 import static org.eclipse.jgit.internal.storage.dfs.DfsObjDatabase.PackSource.GC;
 import static org.eclipse.jgit.internal.storage.dfs.DfsObjDatabase.PackSource.GC_REST;
-import static org.eclipse.jgit.internal.storage.dfs.DfsObjDatabase.PackSource.GC_TXN;
 import static org.eclipse.jgit.internal.storage.dfs.DfsObjDatabase.PackSource.INSERT;
 import static org.eclipse.jgit.internal.storage.dfs.DfsObjDatabase.PackSource.RECEIVE;
 import static org.eclipse.jgit.internal.storage.dfs.DfsObjDatabase.PackSource.UNREACHABLE_GARBAGE;
@@ -30,7 +29,6 @@ public class PackSourceTest {
 		assertEquals(0, DEFAULT_COMPARATOR.compare(COMPACT, COMPACT));
 		assertEquals(0, DEFAULT_COMPARATOR.compare(GC, GC));
 		assertEquals(0, DEFAULT_COMPARATOR.compare(GC_REST, GC_REST));
-		assertEquals(0, DEFAULT_COMPARATOR.compare(GC_TXN, GC_TXN));
 		assertEquals(0, DEFAULT_COMPARATOR.compare(UNREACHABLE_GARBAGE, UNREACHABLE_GARBAGE));
 
 		assertEquals(0, DEFAULT_COMPARATOR.compare(INSERT, RECEIVE));
@@ -47,11 +45,5 @@ public class PackSourceTest {
 
 		assertEquals(-1, DEFAULT_COMPARATOR.compare(GC, GC_REST));
 		assertEquals(1, DEFAULT_COMPARATOR.compare(GC_REST, GC));
-
-		assertEquals(-1, DEFAULT_COMPARATOR.compare(GC_REST, GC_TXN));
-		assertEquals(1, DEFAULT_COMPARATOR.compare(GC_TXN, GC_REST));
-
-		assertEquals(-1, DEFAULT_COMPARATOR.compare(GC_TXN, UNREACHABLE_GARBAGE));
-		assertEquals(1, DEFAULT_COMPARATOR.compare(UNREACHABLE_GARBAGE, GC_TXN));
 	}
 }
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/reftree/LocalDiskRefTreeDatabaseTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/reftree/LocalDiskRefTreeDatabaseTest.java
deleted file mode 100644
index 86016d8f76..0000000000
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/reftree/LocalDiskRefTreeDatabaseTest.java
+++ /dev/null
@@ -1,95 +0,0 @@
-/*
- * Copyright (C) 2016 Google Inc. 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.internal.storage.reftree;
-
-import static org.eclipse.jgit.lib.Constants.HEAD;
-import static org.eclipse.jgit.lib.Constants.MASTER;
-import static org.eclipse.jgit.lib.Constants.ORIG_HEAD;
-import static org.eclipse.jgit.lib.Constants.R_HEADS;
-import static org.eclipse.jgit.lib.RefDatabase.ALL;
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertFalse;
-
-import java.io.File;
-import java.io.IOException;
-import java.util.List;
-
-import org.eclipse.jgit.internal.storage.file.FileRepository;
-import org.eclipse.jgit.junit.LocalDiskRepositoryTestCase;
-import org.eclipse.jgit.junit.TestRepository;
-import org.eclipse.jgit.lib.ObjectId;
-import org.eclipse.jgit.lib.Ref;
-import org.eclipse.jgit.lib.RefDatabase;
-import org.eclipse.jgit.lib.RefUpdate;
-import org.eclipse.jgit.revwalk.RevCommit;
-import org.eclipse.jgit.storage.file.FileBasedConfig;
-import org.eclipse.jgit.storage.file.FileRepositoryBuilder;
-import org.junit.Before;
-import org.junit.Test;
-
-public class LocalDiskRefTreeDatabaseTest extends LocalDiskRepositoryTestCase {
-	private FileRepository repo;
-	private RefTreeDatabase refdb;
-	private RefDatabase bootstrap;
-
-	private TestRepository<FileRepository> testRepo;
-	private RevCommit A;
-	private RevCommit B;
-
-	@Override
-	@Before
-	public void setUp() throws Exception {
-		super.setUp();
-		FileRepository init = createWorkRepository();
-		FileBasedConfig cfg = init.getConfig();
-		cfg.setInt("core", null, "repositoryformatversion", 1);
-		cfg.setString("extensions", null, "refStorage", "reftree");
-		cfg.save();
-
-		repo = (FileRepository) new FileRepositoryBuilder()
-				.setGitDir(init.getDirectory())
-				.build();
-		refdb = (RefTreeDatabase) repo.getRefDatabase();
-		bootstrap = refdb.getBootstrap();
-		addRepoToClose(repo);
-
-		RefUpdate head = refdb.newUpdate(HEAD, true);
-		head.link(R_HEADS + MASTER);
-
-		testRepo = new TestRepository<>(init);
-		A = testRepo.commit().create();
-		B = testRepo.commit(testRepo.getRevWalk().parseCommit(A));
-	}
-
-	@Test
-	public void testHeadOrigHead() throws IOException {
-		RefUpdate master = refdb.newUpdate(HEAD, false);
-		master.setExpectedOldObjectId(ObjectId.zeroId());
-		master.setNewObjectId(A);
-		assertEquals(RefUpdate.Result.NEW, master.update());
-		assertEquals(A, refdb.exactRef(HEAD).getObjectId());
-
-		RefUpdate orig = refdb.newUpdate(ORIG_HEAD, true);
-		orig.setNewObjectId(B);
-		assertEquals(RefUpdate.Result.NEW, orig.update());
-
-		File origFile = new File(repo.getDirectory(), ORIG_HEAD);
-		assertEquals(B.name() + '\n', read(origFile));
-		assertEquals(B, bootstrap.exactRef(ORIG_HEAD).getObjectId());
-		assertEquals(B, refdb.exactRef(ORIG_HEAD).getObjectId());
-		assertFalse(refdb.getRefs(ALL).containsKey(ORIG_HEAD));
-
-		List<Ref> addl = refdb.getAdditionalRefs();
-		assertEquals(2, addl.size());
-		assertEquals(ORIG_HEAD, addl.get(1).getName());
-		assertEquals(B, addl.get(1).getObjectId());
-	}
-}
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/reftree/RefTreeDatabaseTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/reftree/RefTreeDatabaseTest.java
deleted file mode 100644
index ecee5e5d2b..0000000000
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/reftree/RefTreeDatabaseTest.java
+++ /dev/null
@@ -1,689 +0,0 @@
-/*
- * Copyright (C) 2010, 2013, 2016 Google Inc. 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.internal.storage.reftree;
-
-import static org.eclipse.jgit.lib.Constants.HEAD;
-import static org.eclipse.jgit.lib.Constants.ORIG_HEAD;
-import static org.eclipse.jgit.lib.Constants.R_HEADS;
-import static org.eclipse.jgit.lib.Constants.R_TAGS;
-import static org.eclipse.jgit.lib.Ref.Storage.LOOSE;
-import static org.eclipse.jgit.lib.Ref.Storage.PACKED;
-import static org.eclipse.jgit.lib.RefDatabase.ALL;
-import static org.eclipse.jgit.transport.ReceiveCommand.Result.LOCK_FAILURE;
-import static org.eclipse.jgit.transport.ReceiveCommand.Result.OK;
-import static org.eclipse.jgit.transport.ReceiveCommand.Result.REJECTED_NONFASTFORWARD;
-import static org.eclipse.jgit.transport.ReceiveCommand.Result.REJECTED_OTHER_REASON;
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertFalse;
-import static org.junit.Assert.assertNotEquals;
-import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertNull;
-import static org.junit.Assert.assertSame;
-import static org.junit.Assert.assertTrue;
-import static org.junit.Assert.fail;
-
-import java.io.IOException;
-import java.text.MessageFormat;
-import java.util.Arrays;
-import java.util.Collections;
-import java.util.List;
-import java.util.Map;
-
-import org.eclipse.jgit.internal.JGitText;
-import org.eclipse.jgit.internal.storage.dfs.DfsRepositoryDescription;
-import org.eclipse.jgit.internal.storage.dfs.InMemoryRepository;
-import org.eclipse.jgit.junit.TestRepository;
-import org.eclipse.jgit.lib.AnyObjectId;
-import org.eclipse.jgit.lib.BatchRefUpdate;
-import org.eclipse.jgit.lib.CommitBuilder;
-import org.eclipse.jgit.lib.NullProgressMonitor;
-import org.eclipse.jgit.lib.ObjectId;
-import org.eclipse.jgit.lib.ObjectIdRef;
-import org.eclipse.jgit.lib.ObjectInserter;
-import org.eclipse.jgit.lib.ObjectReader;
-import org.eclipse.jgit.lib.Ref;
-import org.eclipse.jgit.lib.RefDatabase;
-import org.eclipse.jgit.lib.RefUpdate;
-import org.eclipse.jgit.lib.SymbolicRef;
-import org.eclipse.jgit.revwalk.RevCommit;
-import org.eclipse.jgit.revwalk.RevTag;
-import org.eclipse.jgit.revwalk.RevWalk;
-import org.eclipse.jgit.transport.ReceiveCommand;
-import org.junit.Before;
-import org.junit.Test;
-
-public class RefTreeDatabaseTest {
-	private InMemRefTreeRepo repo;
-	private RefTreeDatabase refdb;
-	private RefDatabase bootstrap;
-
-	private TestRepository<InMemRefTreeRepo> testRepo;
-	private RevCommit A;
-	private RevCommit B;
-	private RevTag v1_0;
-
-	@Before
-	public void setUp() throws Exception {
-		repo = new InMemRefTreeRepo(new DfsRepositoryDescription("test"));
-		bootstrap = refdb.getBootstrap();
-
-		testRepo = new TestRepository<>(repo);
-		A = testRepo.commit().create();
-		B = testRepo.commit(testRepo.getRevWalk().parseCommit(A));
-		v1_0 = testRepo.tag("v1_0", B);
-		testRepo.getRevWalk().parseBody(v1_0);
-	}
-
-	@Test
-	public void testSupportsAtomic() {
-		assertTrue(refdb.performsAtomicTransactions());
-	}
-
-	@Test
-	public void testGetRefs_EmptyDatabase() throws IOException {
-		assertTrue("no references", refdb.getRefs(ALL).isEmpty());
-		assertTrue("no references", refdb.getRefs(R_HEADS).isEmpty());
-		assertTrue("no references", refdb.getRefs(R_TAGS).isEmpty());
-		assertTrue("no references", refdb.getAdditionalRefs().isEmpty());
-	}
-
-	@Test
-	public void testGetAdditionalRefs() throws IOException {
-		update("refs/heads/master", A);
-
-		List<Ref> addl = refdb.getAdditionalRefs();
-		assertEquals(1, addl.size());
-		assertEquals("refs/txn/committed", addl.get(0).getName());
-		assertEquals(getTxnCommitted(), addl.get(0).getObjectId());
-	}
-
-	@Test
-	public void testGetRefs_HeadOnOneBranch() throws IOException {
-		symref(HEAD, "refs/heads/master");
-		update("refs/heads/master", A);
-
-		Map<String, Ref> all = refdb.getRefs(ALL);
-		assertEquals(2, all.size());
-		assertTrue("has HEAD", all.containsKey(HEAD));
-		assertTrue("has master", all.containsKey("refs/heads/master"));
-
-		Ref head = all.get(HEAD);
-		Ref master = all.get("refs/heads/master");
-
-		assertEquals(HEAD, head.getName());
-		assertTrue(head.isSymbolic());
-		assertSame(LOOSE, head.getStorage());
-		assertSame("uses same ref as target", master, head.getTarget());
-
-		assertEquals("refs/heads/master", master.getName());
-		assertFalse(master.isSymbolic());
-		assertSame(PACKED, master.getStorage());
-		assertEquals(A, master.getObjectId());
-	}
-
-	@Test
-	public void testGetRefs_DetachedHead() throws IOException {
-		update(HEAD, A);
-
-		Map<String, Ref> all = refdb.getRefs(ALL);
-		assertEquals(1, all.size());
-		assertTrue("has HEAD", all.containsKey(HEAD));
-
-		Ref head = all.get(HEAD);
-		assertEquals(HEAD, head.getName());
-		assertFalse(head.isSymbolic());
-		assertSame(PACKED, head.getStorage());
-		assertEquals(A, head.getObjectId());
-	}
-
-	@Test
-	public void testGetRefs_DeeplyNestedBranch() throws IOException {
-		String name = "refs/heads/a/b/c/d/e/f/g/h/i/j/k";
-		update(name, A);
-
-		Map<String, Ref> all = refdb.getRefs(ALL);
-		assertEquals(1, all.size());
-
-		Ref r = all.get(name);
-		assertEquals(name, r.getName());
-		assertFalse(r.isSymbolic());
-		assertSame(PACKED, r.getStorage());
-		assertEquals(A, r.getObjectId());
-	}
-
-	@Test
-	public void testGetRefs_HeadBranchNotBorn() throws IOException {
-		update("refs/heads/A", A);
-		update("refs/heads/B", B);
-
-		Map<String, Ref> all = refdb.getRefs(ALL);
-		assertEquals(2, all.size());
-		assertFalse("no HEAD", all.containsKey(HEAD));
-
-		Ref a = all.get("refs/heads/A");
-		Ref b = all.get("refs/heads/B");
-
-		assertEquals(A, a.getObjectId());
-		assertEquals(B, b.getObjectId());
-
-		assertEquals("refs/heads/A", a.getName());
-		assertEquals("refs/heads/B", b.getName());
-	}
-
-	@Test
-	public void testGetRefs_HeadsOnly() throws IOException {
-		update("refs/heads/A", A);
-		update("refs/heads/B", B);
-		update("refs/tags/v1.0", v1_0);
-
-		Map<String, Ref> heads = refdb.getRefs(R_HEADS);
-		assertEquals(2, heads.size());
-
-		Ref a = heads.get("A");
-		Ref b = heads.get("B");
-
-		assertEquals("refs/heads/A", a.getName());
-		assertEquals("refs/heads/B", b.getName());
-
-		assertEquals(A, a.getObjectId());
-		assertEquals(B, b.getObjectId());
-	}
-
-	@Test
-	public void testGetRefs_TagsOnly() throws IOException {
-		update("refs/heads/A", A);
-		update("refs/heads/B", B);
-		update("refs/tags/v1.0", v1_0);
-
-		Map<String, Ref> tags = refdb.getRefs(R_TAGS);
-		assertEquals(1, tags.size());
-
-		Ref a = tags.get("v1.0");
-		assertEquals("refs/tags/v1.0", a.getName());
-		assertEquals(v1_0, a.getObjectId());
-		assertTrue(a.isPeeled());
-		assertEquals(v1_0.getObject(), a.getPeeledObjectId());
-	}
-
-	@Test
-	public void testGetRefs_HeadsSymref() throws IOException {
-		symref("refs/heads/other", "refs/heads/master");
-		update("refs/heads/master", A);
-
-		Map<String, Ref> heads = refdb.getRefs(R_HEADS);
-		assertEquals(2, heads.size());
-
-		Ref master = heads.get("master");
-		Ref other = heads.get("other");
-
-		assertEquals("refs/heads/master", master.getName());
-		assertEquals(A, master.getObjectId());
-
-		assertEquals("refs/heads/other", other.getName());
-		assertEquals(A, other.getObjectId());
-		assertSame(master, other.getTarget());
-	}
-
-	@Test
-	public void testGetRefs_InvalidPrefixes() throws IOException {
-		update("refs/heads/A", A);
-
-		assertTrue("empty refs/heads", refdb.getRefs("refs/heads").isEmpty());
-		assertTrue("empty objects", refdb.getRefs("objects").isEmpty());
-		assertTrue("empty objects/", refdb.getRefs("objects/").isEmpty());
-	}
-
-	@Test
-	public void testGetRefs_DiscoversNew() throws IOException {
-		update("refs/heads/master", A);
-		Map<String, Ref> orig = refdb.getRefs(ALL);
-
-		update("refs/heads/next", B);
-		Map<String, Ref> next = refdb.getRefs(ALL);
-
-		assertEquals(1, orig.size());
-		assertEquals(2, next.size());
-
-		assertFalse(orig.containsKey("refs/heads/next"));
-		assertTrue(next.containsKey("refs/heads/next"));
-
-		assertEquals(A, next.get("refs/heads/master").getObjectId());
-		assertEquals(B, next.get("refs/heads/next").getObjectId());
-	}
-
-	@Test
-	public void testGetRefs_DiscoversModified() throws IOException {
-		symref(HEAD, "refs/heads/master");
-		update("refs/heads/master", A);
-
-		Map<String, Ref> all = refdb.getRefs(ALL);
-		assertEquals(A, all.get(HEAD).getObjectId());
-
-		update("refs/heads/master", B);
-		all = refdb.getRefs(ALL);
-		assertEquals(B, all.get(HEAD).getObjectId());
-		assertEquals(B, refdb.exactRef(HEAD).getObjectId());
-	}
-
-	@Test
-	public void testGetRefs_CycleInSymbolicRef() throws IOException {
-		symref("refs/1", "refs/2");
-		symref("refs/2", "refs/3");
-		symref("refs/3", "refs/4");
-		symref("refs/4", "refs/5");
-		symref("refs/5", "refs/end");
-		update("refs/end", A);
-
-		Map<String, Ref> all = refdb.getRefs(ALL);
-		Ref r = all.get("refs/1");
-		assertNotNull("has 1", r);
-
-		assertEquals("refs/1", r.getName());
-		assertEquals(A, r.getObjectId());
-		assertTrue(r.isSymbolic());
-
-		r = r.getTarget();
-		assertEquals("refs/2", r.getName());
-		assertEquals(A, r.getObjectId());
-		assertTrue(r.isSymbolic());
-
-		r = r.getTarget();
-		assertEquals("refs/3", r.getName());
-		assertEquals(A, r.getObjectId());
-		assertTrue(r.isSymbolic());
-
-		r = r.getTarget();
-		assertEquals("refs/4", r.getName());
-		assertEquals(A, r.getObjectId());
-		assertTrue(r.isSymbolic());
-
-		r = r.getTarget();
-		assertEquals("refs/5", r.getName());
-		assertEquals(A, r.getObjectId());
-		assertTrue(r.isSymbolic());
-
-		r = r.getTarget();
-		assertEquals("refs/end", r.getName());
-		assertEquals(A, r.getObjectId());
-		assertFalse(r.isSymbolic());
-
-		symref("refs/5", "refs/6");
-		symref("refs/6", "refs/end");
-		all = refdb.getRefs(ALL);
-		assertNull("mising 1 due to cycle", all.get("refs/1"));
-		assertEquals(A, all.get("refs/2").getObjectId());
-		assertEquals(A, all.get("refs/3").getObjectId());
-		assertEquals(A, all.get("refs/4").getObjectId());
-		assertEquals(A, all.get("refs/5").getObjectId());
-		assertEquals(A, all.get("refs/6").getObjectId());
-		assertEquals(A, all.get("refs/end").getObjectId());
-	}
-
-	@Test
-	public void testGetRef_NonExistingBranchConfig() throws IOException {
-		assertNull("find branch config", refdb.findRef("config"));
-		assertNull("find branch config", refdb.findRef("refs/heads/config"));
-	}
-
-	@Test
-	public void testGetRef_FindBranchConfig() throws IOException {
-		update("refs/heads/config", A);
-
-		for (String t : new String[] { "config", "refs/heads/config" }) {
-			Ref r = refdb.findRef(t);
-			assertNotNull("find branch config (" + t + ")", r);
-			assertEquals("for " + t, "refs/heads/config", r.getName());
-			assertEquals("for " + t, A, r.getObjectId());
-		}
-	}
-
-	@Test
-	public void testFirstExactRef() throws IOException {
-		update("refs/heads/A", A);
-		update("refs/tags/v1.0", v1_0);
-
-		Ref a = refdb.firstExactRef("refs/heads/A", "refs/tags/v1.0");
-		Ref one = refdb.firstExactRef("refs/tags/v1.0", "refs/heads/A");
-
-		assertEquals("refs/heads/A", a.getName());
-		assertEquals("refs/tags/v1.0", one.getName());
-
-		assertEquals(A, a.getObjectId());
-		assertEquals(v1_0, one.getObjectId());
-	}
-
-	@Test
-	public void testExactRef_DiscoversModified() throws IOException {
-		symref(HEAD, "refs/heads/master");
-		update("refs/heads/master", A);
-		assertEquals(A, refdb.exactRef(HEAD).getObjectId());
-
-		update("refs/heads/master", B);
-		assertEquals(B, refdb.exactRef(HEAD).getObjectId());
-	}
-
-	@Test
-	public void testIsNameConflicting() throws IOException {
-		update("refs/heads/a/b", A);
-		update("refs/heads/q", B);
-
-		// new references cannot replace an existing container
-		assertTrue(refdb.isNameConflicting("refs"));
-		assertTrue(refdb.isNameConflicting("refs/heads"));
-		assertTrue(refdb.isNameConflicting("refs/heads/a"));
-
-		// existing reference is not conflicting
-		assertFalse(refdb.isNameConflicting("refs/heads/a/b"));
-
-		// new references are not conflicting
-		assertFalse(refdb.isNameConflicting("refs/heads/a/d"));
-		assertFalse(refdb.isNameConflicting("refs/heads/master"));
-
-		// existing reference must not be used as a container
-		assertTrue(refdb.isNameConflicting("refs/heads/a/b/c"));
-		assertTrue(refdb.isNameConflicting("refs/heads/q/master"));
-
-		// refs/txn/ names always conflict.
-		assertTrue(refdb.isNameConflicting(refdb.getTxnCommitted()));
-		assertTrue(refdb.isNameConflicting("refs/txn/foo"));
-	}
-
-	@Test
-	public void testUpdate_RefusesRefsTxnNamespace() throws IOException {
-		ObjectId txnId = getTxnCommitted();
-
-		RefUpdate u = refdb.newUpdate("refs/txn/tmp", false);
-		u.setNewObjectId(B);
-		assertEquals(RefUpdate.Result.LOCK_FAILURE, u.update());
-		assertEquals(txnId, getTxnCommitted());
-
-		ReceiveCommand cmd = command(null, B, "refs/txn/tmp");
-		BatchRefUpdate batch = refdb.newBatchUpdate();
-		batch.addCommand(cmd);
-		try (RevWalk rw = new RevWalk(repo)) {
-			batch.execute(rw, NullProgressMonitor.INSTANCE);
-		}
-		assertEquals(REJECTED_OTHER_REASON, cmd.getResult());
-		assertEquals(MessageFormat.format(JGitText.get().invalidRefName,
-				"refs/txn/tmp"), cmd.getMessage());
-		assertEquals(txnId, getTxnCommitted());
-	}
-
-	@Test
-	public void testUpdate_RefusesDotLockInRefName() throws IOException {
-		ObjectId txnId = getTxnCommitted();
-
-		RefUpdate u = refdb.newUpdate("refs/heads/pu.lock", false);
-		u.setNewObjectId(B);
-		assertEquals(RefUpdate.Result.REJECTED, u.update());
-		assertEquals(txnId, getTxnCommitted());
-
-		ReceiveCommand cmd = command(null, B, "refs/heads/pu.lock");
-		BatchRefUpdate batch = refdb.newBatchUpdate();
-		batch.addCommand(cmd);
-		try (RevWalk rw = new RevWalk(repo)) {
-			batch.execute(rw, NullProgressMonitor.INSTANCE);
-		}
-		assertEquals(REJECTED_OTHER_REASON, cmd.getResult());
-		assertEquals(JGitText.get().funnyRefname, cmd.getMessage());
-		assertEquals(txnId, getTxnCommitted());
-	}
-
-	@Test
-	public void testUpdate_RefusesOrigHeadOnBare() throws IOException {
-		assertTrue(refdb.getRepository().isBare());
-		ObjectId txnId = getTxnCommitted();
-
-		RefUpdate orig = refdb.newUpdate(ORIG_HEAD, true);
-		orig.setNewObjectId(B);
-		assertEquals(RefUpdate.Result.LOCK_FAILURE, orig.update());
-		assertEquals(txnId, getTxnCommitted());
-
-		ReceiveCommand cmd = command(null, B, ORIG_HEAD);
-		BatchRefUpdate batch = refdb.newBatchUpdate();
-		batch.addCommand(cmd);
-		try (RevWalk rw = new RevWalk(repo)) {
-			batch.execute(rw, NullProgressMonitor.INSTANCE);
-		}
-		assertEquals(REJECTED_OTHER_REASON, cmd.getResult());
-		assertEquals(
-				MessageFormat.format(JGitText.get().invalidRefName, ORIG_HEAD),
-				cmd.getMessage());
-		assertEquals(txnId, getTxnCommitted());
-	}
-
-	@Test
-	public void testBatchRefUpdate_NonFastForwardAborts() throws IOException {
-		update("refs/heads/master", A);
-		update("refs/heads/masters", B);
-		ObjectId txnId = getTxnCommitted();
-
-		List<ReceiveCommand> commands = Arrays.asList(
-				command(A, B, "refs/heads/master"),
-				command(B, A, "refs/heads/masters"));
-		BatchRefUpdate batchUpdate = refdb.newBatchUpdate();
-		batchUpdate.addCommand(commands);
-		try (RevWalk rw = new RevWalk(repo)) {
-			batchUpdate.execute(rw, NullProgressMonitor.INSTANCE);
-		}
-		assertEquals(txnId, getTxnCommitted());
-
-		assertEquals(REJECTED_NONFASTFORWARD,
-				commands.get(1).getResult());
-		assertEquals(REJECTED_OTHER_REASON,
-				commands.get(0).getResult());
-		assertEquals(JGitText.get().transactionAborted,
-				commands.get(0).getMessage());
-	}
-
-	@Test
-	public void testBatchRefUpdate_ForceUpdate() throws IOException {
-		update("refs/heads/master", A);
-		update("refs/heads/masters", B);
-		ObjectId txnId = getTxnCommitted();
-
-		List<ReceiveCommand> commands = Arrays.asList(
-				command(A, B, "refs/heads/master"),
-				command(B, A, "refs/heads/masters"));
-		BatchRefUpdate batchUpdate = refdb.newBatchUpdate();
-		batchUpdate.setAllowNonFastForwards(true);
-		batchUpdate.addCommand(commands);
-		try (RevWalk rw = new RevWalk(repo)) {
-			batchUpdate.execute(rw, NullProgressMonitor.INSTANCE);
-		}
-		assertNotEquals(txnId, getTxnCommitted());
-
-		Map<String, Ref> refs = refdb.getRefs(ALL);
-		assertEquals(OK, commands.get(0).getResult());
-		assertEquals(OK, commands.get(1).getResult());
-		assertEquals(
-				"[refs/heads/master, refs/heads/masters]",
-				refs.keySet().toString());
-		assertEquals(B.getId(), refs.get("refs/heads/master").getObjectId());
-		assertEquals(A.getId(), refs.get("refs/heads/masters").getObjectId());
-	}
-
-	@Test
-	public void testBatchRefUpdate_NonFastForwardDoesNotDoExpensiveMergeCheck()
-			throws IOException {
-		update("refs/heads/master", B);
-		ObjectId txnId = getTxnCommitted();
-
-		List<ReceiveCommand> commands = Arrays.asList(
-				command(B, A, "refs/heads/master"));
-		BatchRefUpdate batchUpdate = refdb.newBatchUpdate();
-		batchUpdate.setAllowNonFastForwards(true);
-		batchUpdate.addCommand(commands);
-		try (RevWalk rw = new RevWalk(repo) {
-			@Override
-			public boolean isMergedInto(RevCommit base, RevCommit tip) {
-				fail("isMergedInto() should not be called");
-				return false;
-			}
-		}) {
-			batchUpdate.execute(rw, NullProgressMonitor.INSTANCE);
-		}
-		assertNotEquals(txnId, getTxnCommitted());
-
-		Map<String, Ref> refs = refdb.getRefs(ALL);
-		assertEquals(OK, commands.get(0).getResult());
-		assertEquals(A.getId(), refs.get("refs/heads/master").getObjectId());
-	}
-
-	@Test
-	public void testBatchRefUpdate_ConflictCausesAbort() throws IOException {
-		update("refs/heads/master", A);
-		update("refs/heads/masters", B);
-		ObjectId txnId = getTxnCommitted();
-
-		List<ReceiveCommand> commands = Arrays.asList(
-				command(A, B, "refs/heads/master"),
-				command(null, A, "refs/heads/master/x"),
-				command(null, A, "refs/heads"));
-		BatchRefUpdate batchUpdate = refdb.newBatchUpdate();
-		batchUpdate.setAllowNonFastForwards(true);
-		batchUpdate.addCommand(commands);
-		try (RevWalk rw = new RevWalk(repo)) {
-			batchUpdate.execute(rw, NullProgressMonitor.INSTANCE);
-		}
-		assertEquals(txnId, getTxnCommitted());
-
-		assertEquals(LOCK_FAILURE, commands.get(0).getResult());
-
-		assertEquals(REJECTED_OTHER_REASON, commands.get(1).getResult());
-		assertEquals(JGitText.get().transactionAborted,
-				commands.get(1).getMessage());
-
-		assertEquals(REJECTED_OTHER_REASON, commands.get(2).getResult());
-		assertEquals(JGitText.get().transactionAborted,
-				commands.get(2).getMessage());
-	}
-
-	@Test
-	public void testBatchRefUpdate_NoConflictIfDeleted() throws IOException {
-		update("refs/heads/master", A);
-		update("refs/heads/masters", B);
-		ObjectId txnId = getTxnCommitted();
-
-		List<ReceiveCommand> commands = Arrays.asList(
-				command(A, B, "refs/heads/master"),
-				command(null, A, "refs/heads/masters/x"),
-				command(B, null, "refs/heads/masters"));
-		BatchRefUpdate batchUpdate = refdb.newBatchUpdate();
-		batchUpdate.setAllowNonFastForwards(true);
-		batchUpdate.addCommand(commands);
-		try (RevWalk rw = new RevWalk(repo)) {
-			batchUpdate.execute(rw, NullProgressMonitor.INSTANCE);
-		}
-		assertNotEquals(txnId, getTxnCommitted());
-
-		assertEquals(OK, commands.get(0).getResult());
-		assertEquals(OK, commands.get(1).getResult());
-		assertEquals(OK, commands.get(2).getResult());
-
-		Map<String, Ref> refs = refdb.getRefs(ALL);
-		assertEquals(
-				"[refs/heads/master, refs/heads/masters/x]",
-				refs.keySet().toString());
-		assertEquals(A.getId(), refs.get("refs/heads/masters/x").getObjectId());
-	}
-
-	private ObjectId getTxnCommitted() throws IOException {
-		Ref r = bootstrap.exactRef(refdb.getTxnCommitted());
-		if (r != null && r.getObjectId() != null) {
-			return r.getObjectId();
-		}
-		return ObjectId.zeroId();
-	}
-
-	private static ReceiveCommand command(AnyObjectId a, AnyObjectId b,
-			String name) {
-		return new ReceiveCommand(
-				a != null ? a.copy() : ObjectId.zeroId(),
-				b != null ? b.copy() : ObjectId.zeroId(),
-				name);
-	}
-
-	private void symref(String name, String dst)
-			throws IOException {
-		commit((ObjectReader reader, RefTree tree) -> {
-			Ref old = tree.exactRef(reader, name);
-			Command n = new Command(old, new SymbolicRef(name,
-					new ObjectIdRef.Unpeeled(Ref.Storage.NEW, dst, null)));
-			return tree.apply(Collections.singleton(n));
-		});
-	}
-
-	private void update(String name, ObjectId id)
-			throws IOException {
-		commit((ObjectReader reader, RefTree tree) -> {
-			Ref old = tree.exactRef(reader, name);
-			Command n;
-			try (RevWalk rw = new RevWalk(repo)) {
-				n = new Command(old, Command.toRef(rw, id, null, name, true));
-			}
-			return tree.apply(Collections.singleton(n));
-		});
-	}
-
-	interface Function {
-		boolean apply(ObjectReader reader, RefTree tree) throws IOException;
-	}
-
-	private void commit(Function fun) throws IOException {
-		try (ObjectReader reader = repo.newObjectReader();
-				ObjectInserter inserter = repo.newObjectInserter();
-				RevWalk rw = new RevWalk(reader)) {
-			RefUpdate u = bootstrap.newUpdate(refdb.getTxnCommitted(), false);
-			CommitBuilder cb = new CommitBuilder();
-			testRepo.setAuthorAndCommitter(cb);
-
-			Ref ref = bootstrap.exactRef(refdb.getTxnCommitted());
-			RefTree tree;
-			if (ref != null && ref.getObjectId() != null) {
-				tree = RefTree.read(reader, rw.parseTree(ref.getObjectId()));
-				cb.setParentId(ref.getObjectId());
-				u.setExpectedOldObjectId(ref.getObjectId());
-			} else {
-				tree = RefTree.newEmptyTree();
-				u.setExpectedOldObjectId(ObjectId.zeroId());
-			}
-
-			assertTrue(fun.apply(reader, tree));
-			cb.setTreeId(tree.writeTree(inserter));
-			u.setNewObjectId(inserter.insert(cb));
-			inserter.flush();
-			switch (u.update(rw)) {
-			case NEW:
-			case FAST_FORWARD:
-				break;
-			default:
-				fail("Expected " + u.getName() + " to update");
-			}
-		}
-	}
-
-	private class InMemRefTreeRepo extends InMemoryRepository {
-		private final RefTreeDatabase refs;
-
-		InMemRefTreeRepo(DfsRepositoryDescription repoDesc) {
-			super(repoDesc);
-			refs = new RefTreeDatabase(this, super.getRefDatabase(),
-					"refs/txn/committed");
-			RefTreeDatabaseTest.this.refdb = refs;
-		}
-
-		@Override
-		public RefDatabase getRefDatabase() {
-			return refs;
-		}
-	}
-}
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/reftree/RefTreeTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/reftree/RefTreeTest.java
deleted file mode 100644
index a5b01900cd..0000000000
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/reftree/RefTreeTest.java
+++ /dev/null
@@ -1,270 +0,0 @@
-/*
- * Copyright (C) 2016, Google Inc. 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.internal.storage.reftree;
-
-import static org.eclipse.jgit.lib.Constants.HEAD;
-import static org.eclipse.jgit.lib.Constants.R_HEADS;
-import static org.eclipse.jgit.lib.Constants.R_TAGS;
-import static org.eclipse.jgit.lib.Ref.Storage.LOOSE;
-import static org.eclipse.jgit.lib.Ref.Storage.NEW;
-import static org.eclipse.jgit.transport.ReceiveCommand.Result.LOCK_FAILURE;
-import static org.eclipse.jgit.transport.ReceiveCommand.Result.NOT_ATTEMPTED;
-import static org.eclipse.jgit.transport.ReceiveCommand.Result.REJECTED_OTHER_REASON;
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertFalse;
-import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertNull;
-import static org.junit.Assert.assertSame;
-import static org.junit.Assert.assertTrue;
-
-import java.io.IOException;
-import java.util.Arrays;
-import java.util.Collections;
-
-import org.eclipse.jgit.errors.MissingObjectException;
-import org.eclipse.jgit.internal.JGitText;
-import org.eclipse.jgit.internal.storage.dfs.DfsRepositoryDescription;
-import org.eclipse.jgit.internal.storage.dfs.InMemoryRepository;
-import org.eclipse.jgit.junit.TestRepository;
-import org.eclipse.jgit.lib.ObjectId;
-import org.eclipse.jgit.lib.ObjectIdRef;
-import org.eclipse.jgit.lib.ObjectInserter;
-import org.eclipse.jgit.lib.ObjectReader;
-import org.eclipse.jgit.lib.Ref;
-import org.eclipse.jgit.lib.SymbolicRef;
-import org.eclipse.jgit.revwalk.RevBlob;
-import org.eclipse.jgit.revwalk.RevTag;
-import org.eclipse.jgit.revwalk.RevWalk;
-import org.eclipse.jgit.transport.ReceiveCommand;
-import org.junit.Before;
-import org.junit.Test;
-
-public class RefTreeTest {
-	private static final String R_MASTER = R_HEADS + "master";
-	private InMemoryRepository repo;
-	private TestRepository<InMemoryRepository> git;
-
-	@Before
-	public void setUp() throws IOException {
-		repo = new InMemoryRepository(new DfsRepositoryDescription("RefTree"));
-		git = new TestRepository<>(repo);
-	}
-
-	@Test
-	public void testEmptyTree() throws IOException {
-		RefTree tree = RefTree.newEmptyTree();
-		try (ObjectReader reader = repo.newObjectReader()) {
-			assertNull(HEAD, tree.exactRef(reader, HEAD));
-			assertNull("master", tree.exactRef(reader, R_MASTER));
-		}
-	}
-
-	@Test
-	public void testApplyThenReadMaster() throws Exception {
-		RefTree tree = RefTree.newEmptyTree();
-		RevBlob id = git.blob("A");
-		Command cmd = new Command(null, ref(R_MASTER, id));
-		assertTrue(tree.apply(Collections.singletonList(cmd)));
-		assertSame(NOT_ATTEMPTED, cmd.getResult());
-
-		try (ObjectReader reader = repo.newObjectReader()) {
-			Ref m = tree.exactRef(reader, R_MASTER);
-			assertNotNull(R_MASTER, m);
-			assertEquals(R_MASTER, m.getName());
-			assertEquals(id, m.getObjectId());
-			assertTrue("peeled", m.isPeeled());
-		}
-	}
-
-	@Test
-	public void testUpdateMaster() throws Exception {
-		RefTree tree = RefTree.newEmptyTree();
-		RevBlob id1 = git.blob("A");
-		Command cmd1 = new Command(null, ref(R_MASTER, id1));
-		assertTrue(tree.apply(Collections.singletonList(cmd1)));
-		assertSame(NOT_ATTEMPTED, cmd1.getResult());
-
-		RevBlob id2 = git.blob("B");
-		Command cmd2 = new Command(ref(R_MASTER, id1), ref(R_MASTER, id2));
-		assertTrue(tree.apply(Collections.singletonList(cmd2)));
-		assertSame(NOT_ATTEMPTED, cmd2.getResult());
-
-		try (ObjectReader reader = repo.newObjectReader()) {
-			Ref m = tree.exactRef(reader, R_MASTER);
-			assertNotNull(R_MASTER, m);
-			assertEquals(R_MASTER, m.getName());
-			assertEquals(id2, m.getObjectId());
-			assertTrue("peeled", m.isPeeled());
-		}
-	}
-
-	@Test
-	public void testHeadSymref() throws Exception {
-		RefTree tree = RefTree.newEmptyTree();
-		RevBlob id = git.blob("A");
-		Command cmd1 = new Command(null, ref(R_MASTER, id));
-		Command cmd2 = new Command(null, symref(HEAD, R_MASTER));
-		assertTrue(tree.apply(Arrays.asList(new Command[] { cmd1, cmd2 })));
-		assertSame(NOT_ATTEMPTED, cmd1.getResult());
-		assertSame(NOT_ATTEMPTED, cmd2.getResult());
-
-		try (ObjectReader reader = repo.newObjectReader()) {
-			Ref m = tree.exactRef(reader, HEAD);
-			assertNotNull(HEAD, m);
-			assertEquals(HEAD, m.getName());
-			assertTrue("symbolic", m.isSymbolic());
-			assertNotNull(m.getTarget());
-			assertEquals(R_MASTER, m.getTarget().getName());
-			assertEquals(id, m.getTarget().getObjectId());
-		}
-
-		// Writing flushes some buffers, re-read from blob.
-		ObjectId newId = write(tree);
-		try (ObjectReader reader = repo.newObjectReader();
-				RevWalk rw = new RevWalk(reader)) {
-			tree = RefTree.read(reader, rw.parseTree(newId));
-			Ref m = tree.exactRef(reader, HEAD);
-			assertEquals(R_MASTER, m.getTarget().getName());
-		}
-	}
-
-	@Test
-	public void testTagIsPeeled() throws Exception {
-		String name = "v1.0";
-		RefTree tree = RefTree.newEmptyTree();
-		RevBlob id = git.blob("A");
-		RevTag tag = git.tag(name, id);
-
-		String ref = R_TAGS + name;
-		Command cmd = create(ref, tag);
-		assertTrue(tree.apply(Collections.singletonList(cmd)));
-		assertSame(NOT_ATTEMPTED, cmd.getResult());
-
-		try (ObjectReader reader = repo.newObjectReader()) {
-			Ref m = tree.exactRef(reader, ref);
-			assertNotNull(ref, m);
-			assertEquals(ref, m.getName());
-			assertEquals(tag, m.getObjectId());
-			assertTrue("peeled", m.isPeeled());
-			assertEquals(id, m.getPeeledObjectId());
-		}
-	}
-
-	@Test
-	public void testApplyAlreadyExists() throws Exception {
-		RefTree tree = RefTree.newEmptyTree();
-		RevBlob a = git.blob("A");
-		Command cmd = new Command(null, ref(R_MASTER, a));
-		assertTrue(tree.apply(Collections.singletonList(cmd)));
-		ObjectId treeId = write(tree);
-
-		RevBlob b = git.blob("B");
-		Command cmd1 = create(R_MASTER, b);
-		Command cmd2 = create(R_MASTER, b);
-		assertFalse(tree.apply(Arrays.asList(new Command[] { cmd1, cmd2 })));
-		assertSame(LOCK_FAILURE, cmd1.getResult());
-		assertSame(REJECTED_OTHER_REASON, cmd2.getResult());
-		assertEquals(JGitText.get().transactionAborted, cmd2.getMessage());
-		assertEquals(treeId, write(tree));
-	}
-
-	@Test
-	public void testApplyWrongOldId() throws Exception {
-		RefTree tree = RefTree.newEmptyTree();
-		RevBlob a = git.blob("A");
-		Command cmd = new Command(null, ref(R_MASTER, a));
-		assertTrue(tree.apply(Collections.singletonList(cmd)));
-		ObjectId treeId = write(tree);
-
-		RevBlob b = git.blob("B");
-		RevBlob c = git.blob("C");
-		Command cmd1 = update(R_MASTER, b, c);
-		Command cmd2 = create(R_MASTER, b);
-		assertFalse(tree.apply(Arrays.asList(new Command[] { cmd1, cmd2 })));
-		assertSame(LOCK_FAILURE, cmd1.getResult());
-		assertSame(REJECTED_OTHER_REASON, cmd2.getResult());
-		assertEquals(JGitText.get().transactionAborted, cmd2.getMessage());
-		assertEquals(treeId, write(tree));
-	}
-
-	@Test
-	public void testApplyWrongOldIdButAlreadyCurrentIsNoOp() throws Exception {
-		RefTree tree = RefTree.newEmptyTree();
-		RevBlob a = git.blob("A");
-		Command cmd = new Command(null, ref(R_MASTER, a));
-		assertTrue(tree.apply(Collections.singletonList(cmd)));
-		ObjectId treeId = write(tree);
-
-		RevBlob b = git.blob("B");
-		cmd = update(R_MASTER, b, a);
-		assertTrue(tree.apply(Collections.singletonList(cmd)));
-		assertEquals(treeId, write(tree));
-	}
-
-	@Test
-	public void testApplyCannotCreateSubdirectory() throws Exception {
-		RefTree tree = RefTree.newEmptyTree();
-		RevBlob a = git.blob("A");
-		Command cmd = new Command(null, ref(R_MASTER, a));
-		assertTrue(tree.apply(Collections.singletonList(cmd)));
-		ObjectId treeId = write(tree);
-
-		RevBlob b = git.blob("B");
-		Command cmd1 = create(R_MASTER + "/fail", b);
-		assertFalse(tree.apply(Collections.singletonList(cmd1)));
-		assertSame(LOCK_FAILURE, cmd1.getResult());
-		assertEquals(treeId, write(tree));
-	}
-
-	@Test
-	public void testApplyCannotCreateParentRef() throws Exception {
-		RefTree tree = RefTree.newEmptyTree();
-		RevBlob a = git.blob("A");
-		Command cmd = new Command(null, ref(R_MASTER, a));
-		assertTrue(tree.apply(Collections.singletonList(cmd)));
-		ObjectId treeId = write(tree);
-
-		RevBlob b = git.blob("B");
-		Command cmd1 = create("refs/heads", b);
-		assertFalse(tree.apply(Collections.singletonList(cmd1)));
-		assertSame(LOCK_FAILURE, cmd1.getResult());
-		assertEquals(treeId, write(tree));
-	}
-
-	private static Ref ref(String name, ObjectId id) {
-		return new ObjectIdRef.PeeledNonTag(LOOSE, name, id);
-	}
-
-	private static Ref symref(String name, String dest) {
-		Ref d = new ObjectIdRef.PeeledNonTag(NEW, dest, null);
-		return new SymbolicRef(name, d);
-	}
-
-	private Command create(String name, ObjectId id)
-			throws MissingObjectException, IOException {
-		return update(name, ObjectId.zeroId(), id);
-	}
-
-	private Command update(String name, ObjectId oldId, ObjectId newId)
-			throws MissingObjectException, IOException {
-		try (RevWalk rw = new RevWalk(repo)) {
-			return new Command(rw, new ReceiveCommand(oldId, newId, name));
-		}
-	}
-
-	private ObjectId write(RefTree tree) throws IOException {
-		try (ObjectInserter ins = repo.newObjectInserter()) {
-			ObjectId id = tree.writeTree(ins);
-			ins.flush();
-			return id;
-		}
-	}
-}