Adding upstream version 110.0.1.upstream/110.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2237 insertions, 0 deletions

diff --git a/toolkit/components/places/tests/unit/test_async_transactions.js b/toolkit/components/places/tests/unit/test_async_transactions.js
new file mode 100644
index 0000000000..f016b5b808
--- /dev/null
+++ b/toolkit/components/places/tests/unit/test_async_transactions.js
@@ -0,0 +1,2237 @@
+/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const bmsvc = PlacesUtils.bookmarks;
+const obsvc = PlacesUtils.observers;
+const tagssvc = PlacesUtils.tagging;
+const PT = PlacesTransactions;
+const menuGuid = PlacesUtils.bookmarks.menuGuid;
+
+ChromeUtils.defineESModuleGetters(this, {
+  Preferences: "resource://gre/modules/Preferences.sys.mjs",
+});
+
+// Create and add bookmarks observer.
+var observer = {
+  tagRelatedGuids: new Set(),
+
+  reset() {
+    this.itemsAdded = new Map();
+    this.itemsRemoved = new Map();
+    this.itemsChanged = new Map();
+    this.itemsMoved = new Map();
+    this.itemsTitleChanged = new Map();
+    this.itemsUrlChanged = new Map();
+  },
+
+  handlePlacesEvents(events) {
+    for (let event of events) {
+      switch (event.type) {
+        case "bookmark-added":
+          // Ignore tag items.
+          if (event.isTagging) {
+            this.tagRelatedGuids.add(event.guid);
+            return;
+          }
+
+          this.itemsAdded.set(event.guid, {
+            itemId: event.id,
+            parentGuid: event.parentGuid,
+            index: event.index,
+            itemType: event.itemType,
+            title: event.title,
+            url: event.url,
+          });
+          break;
+        case "bookmark-removed":
+          if (this.tagRelatedGuids.has(event.guid)) {
+            return;
+          }
+
+          this.itemsRemoved.set(event.guid, {
+            parentGuid: event.parentGuid,
+            index: event.index,
+            itemType: event.itemType,
+          });
+          break;
+        case "bookmark-moved":
+          this.itemsMoved.set(event.guid, {
+            oldParentGuid: event.oldParentGuid,
+            oldIndex: event.oldIndex,
+            newParentGuid: event.parentGuid,
+            newIndex: event.index,
+            itemType: event.itemType,
+          });
+          break;
+        case "bookmark-title-changed":
+          if (this.tagRelatedGuids.has(event.guid)) {
+            return;
+          }
+
+          this.itemsTitleChanged.set(event.guid, {
+            title: event.title,
+            parentGuid: event.parentGuid,
+          });
+          break;
+        case "bookmark-url-changed":
+          if (this.tagRelatedGuids.has(event.guid)) {
+            return;
+          }
+
+          this.itemsUrlChanged.set(event.guid, {
+            url: event.url,
+          });
+          break;
+      }
+    }
+  },
+
+  onItemChanged(
+    aItemId,
+    aProperty,
+    aIsAnnoProperty,
+    aNewValue,
+    aLastModified,
+    aItemType,
+    aParentId,
+    aGuid,
+    aParentGuid
+  ) {
+    if (this.tagRelatedGuids.has(aGuid)) {
+      return;
+    }
+
+    let changesForGuid = this.itemsChanged.get(aGuid);
+    if (changesForGuid === undefined) {
+      changesForGuid = new Map();
+      this.itemsChanged.set(aGuid, changesForGuid);
+    }
+    let change = {
+      isAnnoProperty: aIsAnnoProperty,
+      newValue: aNewValue,
+      lastModified: aLastModified,
+      itemType: aItemType,
+    };
+    changesForGuid.set(aProperty, change);
+  },
+};
+Object.setPrototypeOf(observer, NavBookmarkObserver.prototype);
+observer.reset();
+
+// index at which items should begin
+var bmStartIndex = 0;
+
+function run_test() {
+  bmsvc.addObserver(observer);
+  observer.handlePlacesEvents = observer.handlePlacesEvents.bind(observer);
+  obsvc.addListener(
+    [
+      "bookmark-added",
+      "bookmark-removed",
+      "bookmark-moved",
+      "bookmark-title-changed",
+      "bookmark-url-changed",
+    ],
+    observer.handlePlacesEvents
+  );
+  registerCleanupFunction(function() {
+    bmsvc.removeObserver(observer);
+    obsvc.removeListener(
+      [
+        "bookmark-added",
+        "bookmark-removed",
+        "bookmark-moved",
+        "bookmark-title-changed",
+        "bookmark-url-changed",
+      ],
+      observer.handlePlacesEvents
+    );
+  });
+
+  run_next_test();
+}
+
+function sanityCheckTransactionHistory() {
+  Assert.ok(PT.undoPosition <= PT.length);
+
+  let check_entry_throws = f => {
+    try {
+      f();
+      do_throw("PT.entry should throw for invalid input");
+    } catch (ex) {}
+  };
+  check_entry_throws(() => PT.entry(-1));
+  check_entry_throws(() => PT.entry({}));
+  check_entry_throws(() => PT.entry(PT.length));
+
+  if (PT.undoPosition < PT.length) {
+    Assert.equal(PT.topUndoEntry, PT.entry(PT.undoPosition));
+  } else {
+    Assert.equal(null, PT.topUndoEntry);
+  }
+  if (PT.undoPosition > 0) {
+    Assert.equal(PT.topRedoEntry, PT.entry(PT.undoPosition - 1));
+  } else {
+    Assert.equal(null, PT.topRedoEntry);
+  }
+}
+
+function getTransactionsHistoryState() {
+  let history = [];
+  for (let i = 0; i < PT.length; i++) {
+    history.push(PT.entry(i));
+  }
+  return [history, PT.undoPosition];
+}
+
+function ensureUndoState(aExpectedEntries = [], aExpectedUndoPosition = 0) {
+  // ensureUndoState is called in various places during this test, so it's
+  // a good places to sanity-check the transaction-history APIs in all
+  // cases.
+  sanityCheckTransactionHistory();
+
+  let [actualEntries, actualUndoPosition] = getTransactionsHistoryState();
+  Assert.equal(actualEntries.length, aExpectedEntries.length);
+  Assert.equal(actualUndoPosition, aExpectedUndoPosition);
+
+  function checkEqualEntries(aExpectedEntry, aActualEntry) {
+    Assert.equal(aExpectedEntry.length, aActualEntry.length);
+    aExpectedEntry.forEach((t, i) => Assert.equal(t, aActualEntry[i]));
+  }
+  aExpectedEntries.forEach((e, i) => checkEqualEntries(e, actualEntries[i]));
+}
+
+function ensureItemsAdded(...items) {
+  let expectedResultsCount = items.length;
+
+  for (let item of items) {
+    if ("children" in item) {
+      expectedResultsCount += item.children.length;
+    }
+    Assert.ok(
+      observer.itemsAdded.has(item.guid),
+      `Should have the expected guid ${item.guid}`
+    );
+    let info = observer.itemsAdded.get(item.guid);
+    Assert.equal(
+      info.parentGuid,
+      item.parentGuid,
+      "Should have notified the correct parentGuid"
+    );
+    for (let propName of ["title", "index", "itemType"]) {
+      if (propName in item) {
+        Assert.equal(info[propName], item[propName]);
+      }
+    }
+    if ("url" in item) {
+      Assert.ok(
+        Services.io.newURI(info.url).equals(Services.io.newURI(item.url)),
+        "Should have the correct url"
+      );
+    }
+  }
+
+  Assert.equal(
+    observer.itemsAdded.size,
+    expectedResultsCount,
+    "Should have added the correct number of items"
+  );
+}
+
+function ensureItemsRemoved(...items) {
+  let expectedResultsCount = items.length;
+
+  for (let item of items) {
+    // We accept both guids and full info object here.
+    if (typeof item == "string") {
+      Assert.ok(
+        observer.itemsRemoved.has(item),
+        `Should have removed the expected guid ${item}`
+      );
+    } else {
+      if ("children" in item) {
+        expectedResultsCount += item.children.length;
+      }
+
+      Assert.ok(
+        observer.itemsRemoved.has(item.guid),
+        `Should have removed expected guid ${item.guid}`
+      );
+      let info = observer.itemsRemoved.get(item.guid);
+      Assert.equal(
+        info.parentGuid,
+        item.parentGuid,
+        "Should have notified the correct parentGuid"
+      );
+      if ("index" in item) {
+        Assert.equal(info.index, item.index);
+      }
+    }
+  }
+
+  Assert.equal(
+    observer.itemsRemoved.size,
+    expectedResultsCount,
+    "Should have removed the correct number of items"
+  );
+}
+
+function ensureItemsChanged(...items) {
+  for (let item of items) {
+    Assert.ok(observer.itemsChanged.has(item.guid));
+    let changes = observer.itemsChanged.get(item.guid);
+    Assert.ok(changes.has(item.property));
+    let info = changes.get(item.property);
+    Assert.ok(!info.isAnnoProperty);
+    Assert.equal(info.newValue, item.newValue);
+    if ("url" in item) {
+      Assert.ok(item.url.equals(info.url));
+    }
+  }
+}
+
+function ensureItemsMoved(...items) {
+  Assert.equal(
+    observer.itemsMoved.size,
+    items.length,
+    "Should have received the correct number of moved notifications"
+  );
+  for (let item of items) {
+    Assert.ok(
+      observer.itemsMoved.has(item.guid),
+      `Observer should have a move for ${item.guid}`
+    );
+    let info = observer.itemsMoved.get(item.guid);
+    Assert.equal(
+      info.oldParentGuid,
+      item.oldParentGuid,
+      "Should have the correct old parent guid"
+    );
+    Assert.equal(
+      info.oldIndex,
+      item.oldIndex,
+      "Should have the correct old index"
+    );
+    Assert.equal(
+      info.newParentGuid,
+      item.newParentGuid,
+      "Should have the correct new parent guid"
+    );
+    Assert.equal(
+      info.newIndex,
+      item.newIndex,
+      "Should have the correct new index"
+    );
+  }
+}
+
+function ensureItemsTitleChanged(...items) {
+  Assert.equal(
+    observer.itemsTitleChanged.size,
+    items.length,
+    "Should have received the correct number of bookmark-title-changed notifications"
+  );
+  for (const item of items) {
+    Assert.ok(
+      observer.itemsTitleChanged.has(item.guid),
+      `Observer should have a title changed for ${item.guid}`
+    );
+    const info = observer.itemsTitleChanged.get(item.guid);
+    Assert.equal(info.title, item.title, "Should have the correct title");
+    Assert.equal(
+      info.parentGuid,
+      item.parentGuid,
+      "Should have the correct parent guid"
+    );
+  }
+}
+
+function ensureItemsUrlChanged(...items) {
+  Assert.equal(
+    observer.itemsUrlChanged.size,
+    items.length,
+    "Should have received the correct number of bookmark-url-changed notifications"
+  );
+  for (const item of items) {
+    Assert.ok(
+      observer.itemsUrlChanged.has(item.guid),
+      `Observer should have a title changed for ${item.guid}`
+    );
+    const info = observer.itemsUrlChanged.get(item.guid);
+    Assert.equal(info.url, item.url, "Should have the correct url");
+  }
+}
+
+function ensureTagsForURI(aURI, aTags) {
+  let tagsSet = tagssvc.getTagsForURI(Services.io.newURI(aURI));
+  Assert.equal(tagsSet.length, aTags.length);
+  Assert.ok(aTags.every(t => tagsSet.includes(t)));
+}
+
+function createTestFolderInfo(
+  title = "Test Folder",
+  parentGuid = menuGuid,
+  children = undefined
+) {
+  let info = { parentGuid, title };
+  if (children) {
+    info.children = children;
+  }
+  return info;
+}
+
+function removeAllDatesInTree(tree) {
+  if ("lastModified" in tree) {
+    delete tree.lastModified;
+  }
+  if ("dateAdded" in tree) {
+    delete tree.dateAdded;
+  }
+
+  if (!tree.children) {
+    return;
+  }
+
+  for (let child of tree.children) {
+    removeAllDatesInTree(child);
+  }
+}
+
+// Checks if two bookmark trees (as returned by promiseBookmarksTree) are the
+// same.
+// false value for aCheckParentAndPosition is ignored if aIsRestoredItem is set.
+async function ensureEqualBookmarksTrees(
+  aOriginal,
+  aNew,
+  aIsRestoredItem = true,
+  aCheckParentAndPosition = false,
+  aIgnoreAllDates = false
+) {
+  // Note "id" is not-enumerable, and is therefore skipped by Object.keys (both
+  // ours and the one at deepEqual). This is fine for us because ids are not
+  // restored by Redo.
+  if (aIsRestoredItem) {
+    if (aIgnoreAllDates) {
+      removeAllDatesInTree(aOriginal);
+      removeAllDatesInTree(aNew);
+    } else if (!aOriginal.lastModified) {
+      // Ignore lastModified for newly created items, for performance reasons.
+      aNew.lastModified = aOriginal.lastModified;
+    }
+    Assert.deepEqual(aOriginal, aNew);
+    return;
+  }
+
+  for (let property of Object.keys(aOriginal)) {
+    if (property == "children") {
+      Assert.equal(aOriginal.children.length, aNew.children.length);
+      for (let i = 0; i < aOriginal.children.length; i++) {
+        await ensureEqualBookmarksTrees(
+          aOriginal.children[i],
+          aNew.children[i],
+          false,
+          true,
+          aIgnoreAllDates
+        );
+      }
+    } else if (property == "guid") {
+      // guid shouldn't be copied if the item was not restored.
+      Assert.notEqual(aOriginal.guid, aNew.guid);
+    } else if (property == "dateAdded") {
+      // dateAdded shouldn't be copied if the item was not restored.
+      Assert.ok(is_time_ordered(aOriginal.dateAdded, aNew.dateAdded));
+    } else if (property == "lastModified") {
+      // same same, except for the never-changed case
+      if (!aOriginal.lastModified) {
+        Assert.ok(!aNew.lastModified);
+      } else {
+        Assert.ok(is_time_ordered(aOriginal.lastModified, aNew.lastModified));
+      }
+    } else if (
+      aCheckParentAndPosition ||
+      (property != "parentGuid" && property != "index")
+    ) {
+      Assert.deepEqual(aOriginal[property], aNew[property]);
+    }
+  }
+}
+
+async function ensureBookmarksTreeRestoredCorrectly(
+  ...aOriginalBookmarksTrees
+) {
+  for (let originalTree of aOriginalBookmarksTrees) {
+    let restoredTree = await PlacesUtils.promiseBookmarksTree(
+      originalTree.guid
+    );
+    await ensureEqualBookmarksTrees(originalTree, restoredTree);
+  }
+}
+
+async function ensureBookmarksTreeRestoredCorrectlyExceptDates(
+  ...aOriginalBookmarksTrees
+) {
+  for (let originalTree of aOriginalBookmarksTrees) {
+    let restoredTree = await PlacesUtils.promiseBookmarksTree(
+      originalTree.guid
+    );
+    await ensureEqualBookmarksTrees(
+      originalTree,
+      restoredTree,
+      true,
+      false,
+      true
+    );
+  }
+}
+
+async function ensureNonExistent(...aGuids) {
+  for (let guid of aGuids) {
+    Assert.strictEqual(await PlacesUtils.promiseBookmarksTree(guid), null);
+  }
+}
+
+add_task(async function test_recycled_transactions() {
+  async function ensureTransactThrowsFor(aTransaction) {
+    let [txns, undoPosition] = getTransactionsHistoryState();
+    try {
+      await aTransaction.transact();
+      do_throw("Shouldn't be able to use the same transaction twice");
+    } catch (ex) {}
+    ensureUndoState(txns, undoPosition);
+  }
+
+  let txn_a = PT.NewFolder(createTestFolderInfo());
+  await txn_a.transact();
+  ensureUndoState([[txn_a]], 0);
+  await ensureTransactThrowsFor(txn_a);
+
+  await PT.undo();
+  ensureUndoState([[txn_a]], 1);
+  ensureTransactThrowsFor(txn_a);
+
+  await PT.clearTransactionsHistory();
+  ensureUndoState();
+  ensureTransactThrowsFor(txn_a);
+
+  let txn_b = PT.NewFolder(createTestFolderInfo());
+  await PT.batch(async function() {
+    try {
+      await txn_a.transact();
+      do_throw("Shouldn't be able to use the same transaction twice");
+    } catch (ex) {}
+    ensureUndoState();
+    await txn_b.transact();
+  });
+  ensureUndoState([[txn_b]], 0);
+
+  await PT.undo();
+  ensureUndoState([[txn_b]], 1);
+  ensureTransactThrowsFor(txn_a);
+  ensureTransactThrowsFor(txn_b);
+
+  await PT.clearTransactionsHistory();
+  ensureUndoState();
+  observer.reset();
+});
+
+add_task(async function test_new_folder_with_children() {
+  let folder_info = createTestFolderInfo(
+    "Test folder",
+    PlacesUtils.bookmarks.menuGuid,
+    [
+      {
+        url: "http://test_create_item.com",
+        title: "Test creating an item",
+      },
+    ]
+  );
+  ensureUndoState();
+  let txn = PT.NewFolder(folder_info);
+  folder_info.guid = await txn.transact();
+  let originalInfo = await PlacesUtils.promiseBookmarksTree(folder_info.guid);
+  let ensureDo = async function(aRedo = false) {
+    ensureUndoState([[txn]], 0);
+    ensureItemsAdded(folder_info);
+    if (aRedo) {
+      // Ignore lastModified in the comparison, for performance reasons.
+      originalInfo.lastModified = null;
+      await ensureBookmarksTreeRestoredCorrectlyExceptDates(originalInfo);
+    }
+    observer.reset();
+  };
+
+  let ensureUndo = () => {
+    ensureUndoState([[txn]], 1);
+    ensureItemsRemoved({
+      guid: folder_info.guid,
+      parentGuid: folder_info.parentGuid,
+      index: bmStartIndex,
+      children: [
+        {
+          title: "Test creating an item",
+          url: "http://test_create_item.com",
+        },
+      ],
+    });
+    observer.reset();
+  };
+
+  await ensureDo();
+  await PT.undo();
+  await ensureUndo();
+  await PT.redo();
+  await ensureDo(true);
+  await PT.undo();
+  ensureUndo();
+  await PT.clearTransactionsHistory();
+  ensureUndoState();
+});
+
+add_task(async function test_new_bookmark() {
+  let bm_info = {
+    parentGuid: PlacesUtils.bookmarks.unfiledGuid,
+    url: "http://test_create_item.com",
+    index: bmStartIndex,
+    title: "Test creating an item",
+  };
+
+  ensureUndoState();
+  let txn = PT.NewBookmark(bm_info);
+  bm_info.guid = await txn.transact();
+
+  let originalInfo = await PlacesUtils.promiseBookmarksTree(bm_info.guid);
+  let ensureDo = async function(aRedo = false) {
+    ensureUndoState([[txn]], 0);
+    await ensureItemsAdded(bm_info);
+    if (aRedo) {
+      await ensureBookmarksTreeRestoredCorrectly(originalInfo);
+    }
+    observer.reset();
+  };
+  let ensureUndo = () => {
+    ensureUndoState([[txn]], 1);
+    ensureItemsRemoved({
+      guid: bm_info.guid,
+      parentGuid: bm_info.parentGuid,
+      index: bmStartIndex,
+    });
+    observer.reset();
+  };
+
+  await ensureDo();
+  await PT.undo();
+  ensureUndo();
+  await PT.redo(true);
+  await ensureDo();
+  await PT.undo();
+  ensureUndo();
+
+  await PT.clearTransactionsHistory();
+  ensureUndoState();
+});
+
+add_task(async function test_merge_create_folder_and_item() {
+  let folder_info = createTestFolderInfo();
+  let bm_info = {
+    url: "http://test_create_item_to_folder.com",
+    title: "Test Bookmark",
+    index: bmStartIndex,
+  };
+
+  let [folderTxnResult, bkmTxnResult] = await PT.batch(async function() {
+    let folderTxn = PT.NewFolder(folder_info);
+    folder_info.guid = bm_info.parentGuid = await folderTxn.transact();
+    let bkmTxn = PT.NewBookmark(bm_info);
+    bm_info.guid = await bkmTxn.transact();
+    return [folderTxn, bkmTxn];
+  });
+
+  let ensureDo = async function() {
+    ensureUndoState([[bkmTxnResult, folderTxnResult]], 0);
+    await ensureItemsAdded(folder_info, bm_info);
+    observer.reset();
+  };
+
+  let ensureUndo = () => {
+    ensureUndoState([[bkmTxnResult, folderTxnResult]], 1);
+    ensureItemsRemoved(folder_info, bm_info);
+    observer.reset();
+  };
+
+  await ensureDo();
+  await PT.undo();
+  ensureUndo();
+  await PT.redo();
+  await ensureDo();
+  await PT.undo();
+  ensureUndo();
+
+  await PT.clearTransactionsHistory();
+  ensureUndoState();
+});
+
+add_task(async function test_move_items_to_folder() {
+  let folder_a_info = createTestFolderInfo("Folder A");
+  let bkm_a_info = { url: "http://test_move_items.com", title: "Bookmark A" };
+  let bkm_b_info = { url: "http://test_move_items.com", title: "Bookmark B" };
+
+  // Test moving items within the same folder.
+  let [
+    folder_a_txn_result,
+    bkm_a_txn_result,
+    bkm_b_txn_result,
+  ] = await PT.batch(async function() {
+    let folder_a_txn = PT.NewFolder(folder_a_info);
+
+    folder_a_info.guid = bkm_a_info.parentGuid = bkm_b_info.parentGuid = await folder_a_txn.transact();
+    let bkm_a_txn = PT.NewBookmark(bkm_a_info);
+    bkm_a_info.guid = await bkm_a_txn.transact();
+    let bkm_b_txn = PT.NewBookmark(bkm_b_info);
+    bkm_b_info.guid = await bkm_b_txn.transact();
+    return [folder_a_txn, bkm_a_txn, bkm_b_txn];
+  });
+
+  ensureUndoState(
+    [[bkm_b_txn_result, bkm_a_txn_result, folder_a_txn_result]],
+    0
+  );
+
+  let moveTxn = PT.Move({
+    guid: bkm_a_info.guid,
+    newParentGuid: folder_a_info.guid,
+  });
+  await moveTxn.transact();
+
+  let ensureDo = () => {
+    ensureUndoState(
+      [[moveTxn], [bkm_b_txn_result, bkm_a_txn_result, folder_a_txn_result]],
+      0
+    );
+    ensureItemsMoved({
+      guid: bkm_a_info.guid,
+      oldParentGuid: folder_a_info.guid,
+      newParentGuid: folder_a_info.guid,
+      oldIndex: 0,
+      newIndex: 1,
+    });
+    observer.reset();
+  };
+  let ensureUndo = () => {
+    ensureUndoState(
+      [[moveTxn], [bkm_b_txn_result, bkm_a_txn_result, folder_a_txn_result]],
+      1
+    );
+    ensureItemsMoved({
+      guid: bkm_a_info.guid,
+      oldParentGuid: folder_a_info.guid,
+      newParentGuid: folder_a_info.guid,
+      oldIndex: 1,
+      newIndex: 0,
+    });
+    observer.reset();
+  };
+
+  ensureDo();
+  await PT.undo();
+  ensureUndo();
+  await PT.redo();
+  ensureDo();
+  await PT.undo();
+  ensureUndo();
+
+  await PT.clearTransactionsHistory(false, true);
+  ensureUndoState(
+    [[bkm_b_txn_result, bkm_a_txn_result, folder_a_txn_result]],
+    0
+  );
+
+  // Test moving items between folders.
+  let folder_b_info = createTestFolderInfo("Folder B");
+  let folder_b_txn = PT.NewFolder(folder_b_info);
+  folder_b_info.guid = await folder_b_txn.transact();
+  ensureUndoState(
+    [[folder_b_txn], [bkm_b_txn_result, bkm_a_txn_result, folder_a_txn_result]],
+    0
+  );
+
+  moveTxn = PT.Move({
+    guid: bkm_a_info.guid,
+    newParentGuid: folder_b_info.guid,
+    newIndex: bmsvc.DEFAULT_INDEX,
+  });
+  await moveTxn.transact();
+
+  ensureDo = () => {
+    ensureUndoState(
+      [
+        [moveTxn],
+        [folder_b_txn],
+        [bkm_b_txn_result, bkm_a_txn_result, folder_a_txn_result],
+      ],
+      0
+    );
+    ensureItemsMoved({
+      guid: bkm_a_info.guid,
+      oldParentGuid: folder_a_info.guid,
+      newParentGuid: folder_b_info.guid,
+      oldIndex: 0,
+      newIndex: 0,
+    });
+    observer.reset();
+  };
+  ensureUndo = () => {
+    ensureUndoState(
+      [
+        [moveTxn],
+        [folder_b_txn],
+        [bkm_b_txn_result, bkm_a_txn_result, folder_a_txn_result],
+      ],
+      1
+    );
+    ensureItemsMoved({
+      guid: bkm_a_info.guid,
+      oldParentGuid: folder_b_info.guid,
+      newParentGuid: folder_a_info.guid,
+      oldIndex: 0,
+      newIndex: 0,
+    });
+    observer.reset();
+  };
+
+  ensureDo();
+  await PT.undo();
+  ensureUndo();
+  await PT.redo();
+  ensureDo();
+  await PT.undo();
+  ensureUndo();
+
+  // Clean up
+  await PT.undo(); // folder_b_txn
+  await PT.undo(); // folder_a_txn + the bookmarks;
+  Assert.equal(observer.itemsRemoved.size, 4);
+  ensureUndoState(
+    [
+      [moveTxn],
+      [folder_b_txn],
+      [bkm_b_txn_result, bkm_a_txn_result, folder_a_txn_result],
+    ],
+    3
+  );
+  await PT.clearTransactionsHistory();
+  ensureUndoState();
+});
+
+add_task(async function test_move_multiple_items_to_folder() {
+  let folder_a_info = createTestFolderInfo("Folder A");
+  let bkm_a_info = { url: "http://test_move_items.com", title: "Bookmark A" };
+  let bkm_b_info = { url: "http://test_move_items.com", title: "Bookmark B" };
+  let bkm_c_info = { url: "http://test_move_items.com", title: "Bookmark C" };
+
+  // Test moving items within the same folder.
+  let [
+    folder_a_txn_result,
+    bkm_a_txn_result,
+    bkm_b_txn_result,
+    bkm_c_txn_result,
+  ] = await PT.batch(async function() {
+    let folder_a_txn = PT.NewFolder(folder_a_info);
+
+    folder_a_info.guid = bkm_a_info.parentGuid = bkm_b_info.parentGuid = bkm_c_info.parentGuid = await folder_a_txn.transact();
+    let bkm_a_txn = PT.NewBookmark(bkm_a_info);
+    bkm_a_info.guid = await bkm_a_txn.transact();
+    let bkm_b_txn = PT.NewBookmark(bkm_b_info);
+    bkm_b_info.guid = await bkm_b_txn.transact();
+    let bkm_c_txn = PT.NewBookmark(bkm_c_info);
+    bkm_c_info.guid = await bkm_c_txn.transact();
+    return [folder_a_txn, bkm_a_txn, bkm_b_txn, bkm_c_txn];
+  });
+
+  ensureUndoState(
+    [
+      [
+        bkm_c_txn_result,
+        bkm_b_txn_result,
+        bkm_a_txn_result,
+        folder_a_txn_result,
+      ],
+    ],
+    0
+  );
+
+  let moveTxn = PT.Move({
+    guids: [bkm_a_info.guid, bkm_b_info.guid],
+    newParentGuid: folder_a_info.guid,
+  });
+  await moveTxn.transact();
+
+  let ensureDo = () => {
+    ensureUndoState(
+      [
+        [moveTxn],
+        [
+          bkm_c_txn_result,
+          bkm_b_txn_result,
+          bkm_a_txn_result,
+          folder_a_txn_result,
+        ],
+      ],
+      0
+    );
+    ensureItemsMoved(
+      {
+        guid: bkm_a_info.guid,
+        oldParentGuid: folder_a_info.guid,
+        newParentGuid: folder_a_info.guid,
+        oldIndex: 0,
+        newIndex: 2,
+      },
+      {
+        guid: bkm_b_info.guid,
+        oldParentGuid: folder_a_info.guid,
+        newParentGuid: folder_a_info.guid,
+        oldIndex: 1,
+        newIndex: 2,
+      }
+    );
+    observer.reset();
+  };
+  let ensureUndo = () => {
+    ensureUndoState(
+      [
+        [moveTxn],
+        [
+          bkm_c_txn_result,
+          bkm_b_txn_result,
+          bkm_a_txn_result,
+          folder_a_txn_result,
+        ],
+      ],
+      1
+    );
+    ensureItemsMoved(
+      {
+        guid: bkm_a_info.guid,
+        oldParentGuid: folder_a_info.guid,
+        newParentGuid: folder_a_info.guid,
+        oldIndex: 1,
+        newIndex: 0,
+      },
+      {
+        guid: bkm_b_info.guid,
+        oldParentGuid: folder_a_info.guid,
+        newParentGuid: folder_a_info.guid,
+        oldIndex: 2,
+        newIndex: 1,
+      }
+    );
+    observer.reset();
+  };
+
+  ensureDo();
+  await PT.undo();
+  ensureUndo();
+  await PT.redo();
+  ensureDo();
+  await PT.undo();
+  ensureUndo();
+
+  await PT.clearTransactionsHistory(false, true);
+  ensureUndoState(
+    [
+      [
+        bkm_c_txn_result,
+        bkm_b_txn_result,
+        bkm_a_txn_result,
+        folder_a_txn_result,
+      ],
+    ],
+    0
+  );
+
+  // Test moving items between folders.
+  let folder_b_info = createTestFolderInfo("Folder B");
+  let folder_b_txn = PT.NewFolder(folder_b_info);
+  folder_b_info.guid = await folder_b_txn.transact();
+  ensureUndoState(
+    [
+      [folder_b_txn],
+      [
+        bkm_c_txn_result,
+        bkm_b_txn_result,
+        bkm_a_txn_result,
+        folder_a_txn_result,
+      ],
+    ],
+    0
+  );
+
+  moveTxn = PT.Move({
+    guid: bkm_a_info.guid,
+    newParentGuid: folder_b_info.guid,
+    newIndex: bmsvc.DEFAULT_INDEX,
+  });
+  await moveTxn.transact();
+
+  ensureDo = () => {
+    ensureUndoState(
+      [
+        [moveTxn],
+        [folder_b_txn],
+        [
+          bkm_c_txn_result,
+          bkm_b_txn_result,
+          bkm_a_txn_result,
+          folder_a_txn_result,
+        ],
+      ],
+      0
+    );
+    ensureItemsMoved({
+      guid: bkm_a_info.guid,
+      oldParentGuid: folder_a_info.guid,
+      newParentGuid: folder_b_info.guid,
+      oldIndex: 0,
+      newIndex: 0,
+    });
+    observer.reset();
+  };
+  ensureUndo = () => {
+    ensureUndoState(
+      [
+        [moveTxn],
+        [folder_b_txn],
+        [
+          bkm_c_txn_result,
+          bkm_b_txn_result,
+          bkm_a_txn_result,
+          folder_a_txn_result,
+        ],
+      ],
+      1
+    );
+    ensureItemsMoved({
+      guid: bkm_a_info.guid,
+      oldParentGuid: folder_b_info.guid,
+      newParentGuid: folder_a_info.guid,
+      oldIndex: 0,
+      newIndex: 0,
+    });
+    observer.reset();
+  };
+
+  ensureDo();
+  await PT.undo();
+  ensureUndo();
+  await PT.redo();
+  ensureDo();
+  await PT.undo();
+  ensureUndo();
+
+  // Clean up
+  await PT.undo(); // folder_b_txn
+  await PT.undo(); // folder_a_txn + the bookmarks;
+  Assert.equal(observer.itemsRemoved.size, 5);
+  ensureUndoState(
+    [
+      [moveTxn],
+      [folder_b_txn],
+      [
+        bkm_c_txn_result,
+        bkm_b_txn_result,
+        bkm_a_txn_result,
+        folder_a_txn_result,
+      ],
+    ],
+    3
+  );
+  await PT.clearTransactionsHistory();
+  ensureUndoState();
+});
+
+add_task(async function test_remove_folder() {
+  let folder_level_1_info = createTestFolderInfo("Folder Level 1");
+  let folder_level_2_info = { title: "Folder Level 2" };
+  let [folder_level_1_txn_result, folder_level_2_txn_result] = await PT.batch(
+    async function() {
+      let folder_level_1_txn = PT.NewFolder(folder_level_1_info);
+      folder_level_1_info.guid = await folder_level_1_txn.transact();
+      folder_level_2_info.parentGuid = folder_level_1_info.guid;
+      let folder_level_2_txn = PT.NewFolder(folder_level_2_info);
+      folder_level_2_info.guid = await folder_level_2_txn.transact();
+      return [folder_level_1_txn, folder_level_2_txn];
+    }
+  );
+
+  let original_folder_level_1_tree = await PlacesUtils.promiseBookmarksTree(
+    folder_level_1_info.guid
+  );
+  let original_folder_level_2_tree = Object.assign(
+    { parentGuid: original_folder_level_1_tree.guid },
+    original_folder_level_1_tree.children[0]
+  );
+
+  ensureUndoState([[folder_level_2_txn_result, folder_level_1_txn_result]]);
+  await ensureItemsAdded(folder_level_1_info, folder_level_2_info);
+  observer.reset();
+
+  let remove_folder_2_txn = PT.Remove(folder_level_2_info);
+  await remove_folder_2_txn.transact();
+
+  ensureUndoState([
+    [remove_folder_2_txn],
+    [folder_level_2_txn_result, folder_level_1_txn_result],
+  ]);
+  await ensureItemsRemoved(folder_level_2_info);
+
+  // Undo Remove "Folder Level 2"
+  await PT.undo();
+  ensureUndoState(
+    [
+      [remove_folder_2_txn],
+      [folder_level_2_txn_result, folder_level_1_txn_result],
+    ],
+    1
+  );
+  await ensureItemsAdded(folder_level_2_info);
+  await ensureBookmarksTreeRestoredCorrectly(original_folder_level_2_tree);
+  observer.reset();
+
+  // Redo Remove "Folder Level 2"
+  await PT.redo();
+  ensureUndoState([
+    [remove_folder_2_txn],
+    [folder_level_2_txn_result, folder_level_1_txn_result],
+  ]);
+  await ensureItemsRemoved(folder_level_2_info);
+  observer.reset();
+
+  // Undo it again
+  await PT.undo();
+  ensureUndoState(
+    [
+      [remove_folder_2_txn],
+      [folder_level_2_txn_result, folder_level_1_txn_result],
+    ],
+    1
+  );
+  await ensureItemsAdded(folder_level_2_info);
+  await ensureBookmarksTreeRestoredCorrectly(original_folder_level_2_tree);
+  observer.reset();
+
+  // Undo the creation of both folders
+  await PT.undo();
+  ensureUndoState(
+    [
+      [remove_folder_2_txn],
+      [folder_level_2_txn_result, folder_level_1_txn_result],
+    ],
+    2
+  );
+  await ensureItemsRemoved(folder_level_2_info, folder_level_1_info);
+  observer.reset();
+
+  // Redo the creation of both folders
+  await PT.redo();
+  ensureUndoState(
+    [
+      [remove_folder_2_txn],
+      [folder_level_2_txn_result, folder_level_1_txn_result],
+    ],
+    1
+  );
+  await ensureItemsAdded(folder_level_1_info, folder_level_2_info);
+  await ensureBookmarksTreeRestoredCorrectlyExceptDates(
+    original_folder_level_1_tree
+  );
+  observer.reset();
+
+  // Redo Remove "Folder Level 2"
+  await PT.redo();
+  ensureUndoState([
+    [remove_folder_2_txn],
+    [folder_level_2_txn_result, folder_level_1_txn_result],
+  ]);
+  await ensureItemsRemoved(folder_level_2_info);
+  observer.reset();
+
+  // Undo everything one last time
+  await PT.undo();
+  ensureUndoState(
+    [
+      [remove_folder_2_txn],
+      [folder_level_2_txn_result, folder_level_1_txn_result],
+    ],
+    1
+  );
+  await ensureItemsAdded(folder_level_2_info);
+  observer.reset();
+
+  await PT.undo();
+  ensureUndoState(
+    [
+      [remove_folder_2_txn],
+      [folder_level_2_txn_result, folder_level_1_txn_result],
+    ],
+    2
+  );
+  await ensureItemsRemoved(folder_level_2_info, folder_level_2_info);
+  observer.reset();
+
+  await PT.clearTransactionsHistory();
+  ensureUndoState();
+});
+
+add_task(async function test_add_and_remove_bookmarks_with_additional_info() {
+  const testURI = "http://add.remove.tag";
+  const TAG_1 = "TestTag1";
+  const TAG_2 = "TestTag2";
+
+  let folder_info = createTestFolderInfo();
+  folder_info.guid = await PT.NewFolder(folder_info).transact();
+  let ensureTags = ensureTagsForURI.bind(null, testURI);
+
+  // Check that the NewBookmark transaction preserves tags.
+  observer.reset();
+  let b1_info = { parentGuid: folder_info.guid, url: testURI, tags: [TAG_1] };
+  b1_info.guid = await PT.NewBookmark(b1_info).transact();
+  let b1_originalInfo = await PlacesUtils.promiseBookmarksTree(b1_info.guid);
+  ensureTags([TAG_1]);
+  await PT.undo();
+  ensureTags([]);
+
+  observer.reset();
+  await PT.redo();
+  await ensureBookmarksTreeRestoredCorrectly(b1_originalInfo);
+  ensureTags([TAG_1]);
+
+  // Check if the Remove transaction removes and restores tags of children
+  // correctly.
+  await PT.Remove(folder_info.guid).transact();
+  ensureTags([]);
+
+  observer.reset();
+  await PT.undo();
+  await ensureBookmarksTreeRestoredCorrectly(b1_originalInfo);
+  ensureTags([TAG_1]);
+
+  await PT.redo();
+  ensureTags([]);
+
+  observer.reset();
+  await PT.undo();
+  await ensureBookmarksTreeRestoredCorrectly(b1_originalInfo);
+  ensureTags([TAG_1]);
+
+  // * Check that no-op tagging (the uri is already tagged with TAG_1) is
+  //   also a no-op on undo.
+  observer.reset();
+  let b2_info = {
+    parentGuid: folder_info.guid,
+    url: testURI,
+    tags: [TAG_1, TAG_2],
+  };
+  b2_info.guid = await PT.NewBookmark(b2_info).transact();
+  ensureTags([TAG_1, TAG_2]);
+
+  observer.reset();
+  await PT.undo();
+  await ensureItemsRemoved(b2_info);
+  ensureTags([TAG_1]);
+
+  // Check if Remove correctly restores tags.
+  observer.reset();
+  await PT.redo();
+  ensureTags([TAG_1, TAG_2]);
+
+  // Test Remove for multiple items.
+  observer.reset();
+  await PT.Remove(b1_info.guid).transact();
+  await PT.Remove(b2_info.guid).transact();
+  await PT.Remove(folder_info.guid).transact();
+  await ensureItemsRemoved(b1_info, b2_info, folder_info);
+  ensureTags([]);
+
+  observer.reset();
+  await PT.undo();
+  await ensureItemsAdded(folder_info);
+  ensureTags([]);
+
+  observer.reset();
+  await PT.undo();
+  ensureTags([TAG_1, TAG_2]);
+
+  observer.reset();
+  await PT.undo();
+  await ensureItemsAdded(b1_info);
+  ensureTags([TAG_1, TAG_2]);
+
+  // The redo calls below cleanup everything we did.
+  observer.reset();
+  await PT.redo();
+  await ensureItemsRemoved(b1_info);
+  ensureTags([TAG_1, TAG_2]);
+
+  observer.reset();
+  await PT.redo();
+  // The tag containers are removed in async and take some time
+  let oldCountTag1 = 0;
+  let oldCountTag2 = 0;
+  let allTags = await bmsvc.fetchTags();
+  for (let i of allTags) {
+    if (i.name == TAG_1) {
+      oldCountTag1 = i.count;
+    }
+    if (i.name == TAG_2) {
+      oldCountTag2 = i.count;
+    }
+  }
+  await TestUtils.waitForCondition(async () => {
+    allTags = await bmsvc.fetchTags();
+    let newCountTag1 = 0;
+    let newCountTag2 = 0;
+    for (let i of allTags) {
+      if (i.name == TAG_1) {
+        newCountTag1 = i.count;
+      }
+      if (i.name == TAG_2) {
+        newCountTag2 = i.count;
+      }
+    }
+    return newCountTag1 == oldCountTag1 - 1 && newCountTag2 == oldCountTag2 - 1;
+  });
+  await ensureItemsRemoved(b2_info);
+
+  ensureTags([]);
+
+  observer.reset();
+  await PT.redo();
+  await ensureItemsRemoved(folder_info);
+  ensureTags([]);
+
+  await PT.clearTransactionsHistory();
+  ensureUndoState();
+});
+
+add_task(async function test_creating_and_removing_a_separator() {
+  let folder_info = createTestFolderInfo();
+  let separator_info = {};
+  let undoEntries = [];
+
+  observer.reset();
+  let create_txns = await PT.batch(async function() {
+    let folder_txn = PT.NewFolder(folder_info);
+    folder_info.guid = separator_info.parentGuid = await folder_txn.transact();
+    let separator_txn = PT.NewSeparator(separator_info);
+    separator_info.guid = await separator_txn.transact();
+    return [separator_txn, folder_txn];
+  });
+  undoEntries.unshift(create_txns);
+  ensureUndoState(undoEntries, 0);
+  ensureItemsAdded(folder_info, separator_info);
+
+  observer.reset();
+  await PT.undo();
+  ensureUndoState(undoEntries, 1);
+  ensureItemsRemoved(folder_info, separator_info);
+
+  observer.reset();
+  await PT.redo();
+  ensureUndoState(undoEntries, 0);
+  ensureItemsAdded(folder_info, separator_info);
+
+  observer.reset();
+  let remove_sep_txn = PT.Remove(separator_info);
+  await remove_sep_txn.transact();
+  undoEntries.unshift([remove_sep_txn]);
+  ensureUndoState(undoEntries, 0);
+  ensureItemsRemoved(separator_info);
+
+  observer.reset();
+  await PT.undo();
+  ensureUndoState(undoEntries, 1);
+  ensureItemsAdded(separator_info);
+
+  observer.reset();
+  await PT.undo();
+  ensureUndoState(undoEntries, 2);
+  ensureItemsRemoved(folder_info, separator_info);
+
+  observer.reset();
+  await PT.redo();
+  ensureUndoState(undoEntries, 1);
+  ensureItemsAdded(folder_info, separator_info);
+
+  // Clear redo entries and check that |redo| does nothing
+  observer.reset();
+  await PT.clearTransactionsHistory(false, true);
+  undoEntries.shift();
+  ensureUndoState(undoEntries, 0);
+  await PT.redo();
+  ensureItemsAdded();
+  ensureItemsRemoved();
+
+  // Cleanup
+  observer.reset();
+  await PT.undo();
+  ensureUndoState(undoEntries, 1);
+  ensureItemsRemoved(folder_info, separator_info);
+  await PT.clearTransactionsHistory();
+  ensureUndoState();
+});
+
+add_task(async function test_edit_title() {
+  let bm_info = {
+    parentGuid: PlacesUtils.bookmarks.unfiledGuid,
+    url: "http://test_create_item.com",
+    title: "Original Title",
+  };
+
+  function ensureTitleChange(aCurrentTitle) {
+    ensureItemsTitleChanged({
+      guid: bm_info.guid,
+      title: aCurrentTitle,
+      parentGuid: PlacesUtils.bookmarks.unfiledGuid,
+    });
+  }
+
+  bm_info.guid = await PT.NewBookmark(bm_info).transact();
+
+  observer.reset();
+  await PT.EditTitle({ guid: bm_info.guid, title: "New Title" }).transact();
+  ensureTitleChange("New Title");
+
+  observer.reset();
+  await PT.undo();
+  ensureTitleChange("Original Title");
+
+  observer.reset();
+  await PT.redo();
+  ensureTitleChange("New Title");
+
+  // Cleanup
+  observer.reset();
+  await PT.undo();
+  ensureTitleChange("Original Title");
+  await PT.undo();
+  ensureItemsRemoved(bm_info);
+
+  await PT.clearTransactionsHistory();
+  ensureUndoState();
+});
+
+add_task(async function test_edit_url() {
+  let oldURI = "http://old.test_editing_item_uri.com/";
+  let newURI = "http://new.test_editing_item_uri.com/";
+  let bm_info = {
+    parentGuid: PlacesUtils.bookmarks.unfiledGuid,
+    url: oldURI,
+    tags: ["TestTag"],
+  };
+  function ensureURIAndTags(
+    aPreChangeURI,
+    aPostChangeURI,
+    aOLdURITagsPreserved
+  ) {
+    ensureItemsUrlChanged({
+      guid: bm_info.guid,
+      url: aPostChangeURI,
+    });
+    ensureTagsForURI(aPostChangeURI, bm_info.tags);
+    ensureTagsForURI(aPreChangeURI, aOLdURITagsPreserved ? bm_info.tags : []);
+  }
+
+  bm_info.guid = await PT.NewBookmark(bm_info).transact();
+  ensureTagsForURI(oldURI, bm_info.tags);
+
+  // When there's a single bookmark for the same url, tags should be moved.
+  observer.reset();
+  await PT.EditUrl({ guid: bm_info.guid, url: newURI }).transact();
+  ensureURIAndTags(oldURI, newURI, false);
+
+  observer.reset();
+  await PT.undo();
+  ensureURIAndTags(newURI, oldURI, false);
+
+  observer.reset();
+  await PT.redo();
+  ensureURIAndTags(oldURI, newURI, false);
+
+  observer.reset();
+  await PT.undo();
+  ensureURIAndTags(newURI, oldURI, false);
+
+  // When there're multiple bookmarks for the same url, tags should be copied.
+  let bm2_info = Object.create(bm_info);
+  bm2_info.guid = await PT.NewBookmark(bm2_info).transact();
+  let bm3_info = Object.create(bm_info);
+  bm3_info.url = newURI;
+  bm3_info.guid = await PT.NewBookmark(bm3_info).transact();
+
+  observer.reset();
+  await PT.EditUrl({ guid: bm_info.guid, url: newURI }).transact();
+  ensureURIAndTags(oldURI, newURI, true);
+
+  observer.reset();
+  await PT.undo();
+  ensureURIAndTags(newURI, oldURI, true);
+
+  observer.reset();
+  await PT.redo();
+  ensureURIAndTags(oldURI, newURI, true);
+
+  // Cleanup
+  observer.reset();
+  await PT.undo();
+  ensureURIAndTags(newURI, oldURI, true);
+  await PT.undo();
+  await PT.undo();
+  await PT.undo();
+  ensureItemsRemoved(bm3_info, bm2_info, bm_info);
+
+  await PT.clearTransactionsHistory();
+  ensureUndoState();
+});
+
+add_task(async function test_edit_keyword() {
+  let bm_info = {
+    parentGuid: PlacesUtils.bookmarks.unfiledGuid,
+    url: "http://test.edit.keyword/",
+  };
+  const KEYWORD = "test_keyword";
+  bm_info.guid = await PT.NewBookmark(bm_info).transact();
+  function ensureKeywordChange(aCurrentKeyword = "") {
+    ensureItemsChanged({
+      guid: bm_info.guid,
+      property: "keyword",
+      newValue: aCurrentKeyword,
+    });
+  }
+
+  bm_info.guid = await PT.NewBookmark(bm_info).transact();
+
+  observer.reset();
+  await PT.EditKeyword({
+    guid: bm_info.guid,
+    keyword: KEYWORD,
+    postData: "postData",
+  }).transact();
+  ensureKeywordChange(KEYWORD);
+  let entry = await PlacesUtils.keywords.fetch(KEYWORD);
+  Assert.equal(entry.url.href, bm_info.url);
+  Assert.equal(entry.postData, "postData");
+
+  observer.reset();
+  await PT.undo();
+  ensureKeywordChange();
+  entry = await PlacesUtils.keywords.fetch(KEYWORD);
+  Assert.equal(entry, null);
+
+  observer.reset();
+  await PT.redo();
+  ensureKeywordChange(KEYWORD);
+  entry = await PlacesUtils.keywords.fetch(KEYWORD);
+  Assert.equal(entry.url.href, bm_info.url);
+  Assert.equal(entry.postData, "postData");
+
+  // Cleanup
+  observer.reset();
+  await PT.undo();
+  ensureKeywordChange();
+  await PT.undo();
+  ensureItemsRemoved(bm_info);
+
+  await PT.clearTransactionsHistory();
+  ensureUndoState();
+});
+
+add_task(async function test_edit_keyword_null_postData() {
+  let bm_info = {
+    parentGuid: PlacesUtils.bookmarks.unfiledGuid,
+    url: "http://test.edit.keyword/",
+  };
+  const KEYWORD = "test_keyword";
+  bm_info.guid = await PT.NewBookmark(bm_info).transact();
+  function ensureKeywordChange(aCurrentKeyword = "") {
+    ensureItemsChanged({
+      guid: bm_info.guid,
+      property: "keyword",
+      newValue: aCurrentKeyword,
+    });
+  }
+
+  bm_info.guid = await PT.NewBookmark(bm_info).transact();
+
+  observer.reset();
+  await PT.EditKeyword({
+    guid: bm_info.guid,
+    keyword: KEYWORD,
+    postData: null,
+  }).transact();
+  ensureKeywordChange(KEYWORD);
+  let entry = await PlacesUtils.keywords.fetch(KEYWORD);
+  Assert.equal(entry.url.href, bm_info.url);
+  Assert.equal(entry.postData, null);
+
+  observer.reset();
+  await PT.undo();
+  ensureKeywordChange();
+  entry = await PlacesUtils.keywords.fetch(KEYWORD);
+  Assert.equal(entry, null);
+
+  observer.reset();
+  await PT.redo();
+  ensureKeywordChange(KEYWORD);
+  entry = await PlacesUtils.keywords.fetch(KEYWORD);
+  Assert.equal(entry.url.href, bm_info.url);
+  Assert.equal(entry.postData, null);
+
+  // Cleanup
+  observer.reset();
+  await PT.undo();
+  ensureKeywordChange();
+  await PT.undo();
+  ensureItemsRemoved(bm_info);
+
+  await PT.clearTransactionsHistory();
+  ensureUndoState();
+});
+
+add_task(async function test_edit_specific_keyword() {
+  let bm_info = {
+    parentGuid: PlacesUtils.bookmarks.unfiledGuid,
+    url: "http://test.edit.keyword/",
+  };
+  bm_info.guid = await PT.NewBookmark(bm_info).transact();
+  function ensureKeywordChange(aCurrentKeyword = "", aPreviousKeyword = "") {
+    ensureItemsChanged({
+      guid: bm_info.guid,
+      property: "keyword",
+      newValue: aCurrentKeyword,
+    });
+  }
+
+  await PlacesUtils.keywords.insert({
+    keyword: "kw1",
+    url: bm_info.url,
+    postData: "postData1",
+  });
+  await PlacesUtils.keywords.insert({
+    keyword: "kw2",
+    url: bm_info.url,
+    postData: "postData2",
+  });
+  bm_info.guid = await PT.NewBookmark(bm_info).transact();
+
+  observer.reset();
+  await PT.EditKeyword({
+    guid: bm_info.guid,
+    keyword: "keyword",
+    oldKeyword: "kw2",
+  }).transact();
+  ensureKeywordChange("keyword", "kw2");
+  let entry = await PlacesUtils.keywords.fetch("kw1");
+  Assert.equal(entry.url.href, bm_info.url);
+  Assert.equal(entry.postData, "postData1");
+  entry = await PlacesUtils.keywords.fetch("keyword");
+  Assert.equal(entry.url.href, bm_info.url);
+  Assert.equal(entry.postData, "postData2");
+  entry = await PlacesUtils.keywords.fetch("kw2");
+  Assert.equal(entry, null);
+
+  observer.reset();
+  await PT.undo();
+  ensureKeywordChange("kw2", "keyword");
+  entry = await PlacesUtils.keywords.fetch("kw1");
+  Assert.equal(entry.url.href, bm_info.url);
+  Assert.equal(entry.postData, "postData1");
+  entry = await PlacesUtils.keywords.fetch("kw2");
+  Assert.equal(entry.url.href, bm_info.url);
+  Assert.equal(entry.postData, "postData2");
+  entry = await PlacesUtils.keywords.fetch("keyword");
+  Assert.equal(entry, null);
+
+  observer.reset();
+  await PT.redo();
+  ensureKeywordChange("keyword", "kw2");
+  entry = await PlacesUtils.keywords.fetch("kw1");
+  Assert.equal(entry.url.href, bm_info.url);
+  Assert.equal(entry.postData, "postData1");
+  entry = await PlacesUtils.keywords.fetch("keyword");
+  Assert.equal(entry.url.href, bm_info.url);
+  Assert.equal(entry.postData, "postData2");
+  entry = await PlacesUtils.keywords.fetch("kw2");
+  Assert.equal(entry, null);
+
+  // Cleanup
+  observer.reset();
+  await PT.undo();
+  ensureKeywordChange("kw2");
+  await PT.undo();
+  ensureItemsRemoved(bm_info);
+
+  await PT.clearTransactionsHistory();
+  ensureUndoState();
+});
+
+add_task(async function test_tag_uri() {
+  // This also tests passing uri specs.
+  let bm_info_a = {
+    url: "http://bookmarked.uri",
+    parentGuid: PlacesUtils.bookmarks.unfiledGuid,
+  };
+  let bm_info_b = {
+    url: "http://bookmarked2.uri",
+    parentGuid: PlacesUtils.bookmarks.unfiledGuid,
+  };
+  let unbookmarked_uri = "http://un.bookmarked.uri";
+
+  await PT.batch(async function() {
+    bm_info_a.guid = await PT.NewBookmark(bm_info_a).transact();
+    bm_info_b.guid = await PT.NewBookmark(bm_info_b).transact();
+  });
+
+  async function doTest(aInfo) {
+    let urls = "url" in aInfo ? [aInfo.url] : aInfo.urls;
+    let tags = "tag" in aInfo ? [aInfo.tag] : aInfo.tags;
+
+    let tagWillAlsoBookmark = new Set();
+    for (let url of urls) {
+      if (!(await bmsvc.fetch({ url }))) {
+        tagWillAlsoBookmark.add(url);
+      }
+    }
+
+    async function ensureTagsSet() {
+      for (let url of urls) {
+        ensureTagsForURI(url, tags);
+        Assert.ok(await bmsvc.fetch({ url }));
+      }
+    }
+    async function ensureTagsUnset() {
+      for (let url of urls) {
+        ensureTagsForURI(url, []);
+        if (tagWillAlsoBookmark.has(url)) {
+          Assert.ok(!(await bmsvc.fetch({ url })));
+        } else {
+          Assert.ok(await bmsvc.fetch({ url }));
+        }
+      }
+    }
+
+    await PT.Tag(aInfo).transact();
+    await ensureTagsSet();
+    await PT.undo();
+    await ensureTagsUnset();
+    await PT.redo();
+    await ensureTagsSet();
+    await PT.undo();
+    await ensureTagsUnset();
+  }
+
+  await doTest({ url: bm_info_a.url, tags: ["MyTag"] });
+  await doTest({ urls: [bm_info_a.url], tag: "MyTag" });
+  await doTest({ urls: [bm_info_a.url, bm_info_b.url], tags: ["A, B"] });
+  await doTest({ urls: [bm_info_a.url, unbookmarked_uri], tag: "C" });
+  // Duplicate URLs listed.
+  await doTest({
+    urls: [bm_info_a.url, bm_info_b.url, bm_info_a.url],
+    tag: "D",
+  });
+
+  // Cleanup
+  observer.reset();
+  await PT.undo();
+  ensureItemsRemoved(bm_info_a, bm_info_b);
+
+  await PT.clearTransactionsHistory();
+  ensureUndoState();
+});
+
+add_task(async function test_untag_uri() {
+  let bm_info_a = {
+    url: "http://bookmarked.uri",
+    parentGuid: PlacesUtils.bookmarks.unfiledGuid,
+    tags: ["A", "B"],
+  };
+  let bm_info_b = {
+    url: "http://bookmarked2.uri",
+    parentGuid: PlacesUtils.bookmarks.unfiledGuid,
+    tag: "B",
+  };
+
+  await PT.batch(async function() {
+    bm_info_a.guid = await PT.NewBookmark(bm_info_a).transact();
+    ensureTagsForURI(bm_info_a.url, bm_info_a.tags);
+    bm_info_b.guid = await PT.NewBookmark(bm_info_b).transact();
+    ensureTagsForURI(bm_info_b.url, [bm_info_b.tag]);
+  });
+
+  async function doTest(aInfo) {
+    let urls, tagsRemoved;
+    if (typeof aInfo == "string") {
+      urls = [aInfo];
+      tagsRemoved = [];
+    } else if (Array.isArray(aInfo)) {
+      urls = aInfo;
+      tagsRemoved = [];
+    } else {
+      urls = "url" in aInfo ? [aInfo.url] : aInfo.urls;
+      tagsRemoved = "tag" in aInfo ? [aInfo.tag] : aInfo.tags;
+    }
+
+    let preRemovalTags = new Map();
+    for (let url of urls) {
+      preRemovalTags.set(url, tagssvc.getTagsForURI(Services.io.newURI(url)));
+    }
+
+    function ensureTagsSet() {
+      for (let url of urls) {
+        ensureTagsForURI(url, preRemovalTags.get(url));
+      }
+    }
+    function ensureTagsUnset() {
+      for (let url of urls) {
+        let expectedTags = !tagsRemoved.length
+          ? []
+          : preRemovalTags.get(url).filter(tag => !tagsRemoved.includes(tag));
+        ensureTagsForURI(url, expectedTags);
+      }
+    }
+
+    await PT.Untag(aInfo).transact();
+    await ensureTagsUnset();
+    await PT.undo();
+    await ensureTagsSet();
+    await PT.redo();
+    await ensureTagsUnset();
+    await PT.undo();
+    await ensureTagsSet();
+  }
+
+  await doTest(bm_info_a);
+  await doTest(bm_info_b);
+  await doTest(bm_info_a.url);
+  await doTest(bm_info_b.url);
+  await doTest([bm_info_a.url, bm_info_b.url]);
+  await doTest({ urls: [bm_info_a.url, bm_info_b.url], tags: ["A", "B"] });
+  await doTest({ urls: [bm_info_a.url, bm_info_b.url], tag: "B" });
+  await doTest({ urls: [bm_info_a.url, bm_info_b.url], tag: "C" });
+  await doTest({ urls: [bm_info_a.url, bm_info_b.url], tags: ["C"] });
+
+  // Cleanup
+  observer.reset();
+  await PT.undo();
+  ensureItemsRemoved(bm_info_a, bm_info_b);
+
+  await PT.clearTransactionsHistory();
+  ensureUndoState();
+});
+
+add_task(async function test_sort_folder_by_name() {
+  let folder_info = createTestFolderInfo();
+
+  let url = "http://sort.by.name/";
+  let preSep = ["3", "2", "1"].map(i => ({ title: i, url }));
+  let sep = {};
+  let postSep = ["c", "b", "a"].map(l => ({ title: l, url }));
+  let originalOrder = [...preSep, sep, ...postSep];
+  let sortedOrder = [
+    ...preSep.slice(0).reverse(),
+    sep,
+    ...postSep.slice(0).reverse(),
+  ];
+  await PT.batch(async function() {
+    folder_info.guid = await PT.NewFolder(folder_info).transact();
+    for (let info of originalOrder) {
+      info.parentGuid = folder_info.guid;
+      info.guid = await (info == sep
+        ? PT.NewSeparator(info).transact()
+        : PT.NewBookmark(info).transact());
+    }
+  });
+
+  let folderContainer = PlacesUtils.getFolderContents(folder_info.guid).root;
+  function ensureOrder(aOrder) {
+    for (let i = 0; i < folderContainer.childCount; i++) {
+      Assert.equal(folderContainer.getChild(i).bookmarkGuid, aOrder[i].guid);
+    }
+  }
+
+  ensureOrder(originalOrder);
+  await PT.SortByName(folder_info.guid).transact();
+  ensureOrder(sortedOrder);
+  await PT.undo();
+  ensureOrder(originalOrder);
+  await PT.redo();
+  ensureOrder(sortedOrder);
+
+  // Cleanup
+  observer.reset();
+  await PT.undo();
+  ensureOrder(originalOrder);
+  await PT.undo();
+  ensureItemsRemoved(...originalOrder, folder_info);
+});
+
+add_task(async function test_copy() {
+  async function duplicate_and_test(aOriginalGuid) {
+    let txn = PT.Copy({
+      guid: aOriginalGuid,
+      newParentGuid: PlacesUtils.bookmarks.unfiledGuid,
+    });
+    let duplicateGuid = await txn.transact();
+    let originalInfo = await PlacesUtils.promiseBookmarksTree(aOriginalGuid);
+    let duplicateInfo = await PlacesUtils.promiseBookmarksTree(duplicateGuid);
+    await ensureEqualBookmarksTrees(originalInfo, duplicateInfo, false);
+
+    async function redo() {
+      await PT.redo();
+      await ensureBookmarksTreeRestoredCorrectlyExceptDates(originalInfo);
+      await PT.redo();
+      await ensureBookmarksTreeRestoredCorrectlyExceptDates(duplicateInfo);
+    }
+    async function undo() {
+      await PT.undo();
+      // also undo the original item addition.
+      await PT.undo();
+      await ensureNonExistent(aOriginalGuid, duplicateGuid);
+    }
+
+    await undo();
+    await redo();
+    await undo();
+    await redo();
+
+    // Cleanup. This also remove the original item.
+    await PT.undo();
+    observer.reset();
+    await PT.clearTransactionsHistory();
+  }
+
+  let timerPrecision = Preferences.get("privacy.reduceTimerPrecision");
+  Preferences.set("privacy.reduceTimerPrecision", false);
+
+  registerCleanupFunction(function() {
+    Preferences.set("privacy.reduceTimerPrecision", timerPrecision);
+  });
+
+  // Test duplicating leafs (bookmark, separator, empty folder)
+  PT.NewBookmark({
+    url: "http://test.item.duplicate",
+    parentGuid: PlacesUtils.bookmarks.unfiledGuid,
+    annos: [{ name: "Anno", value: "AnnoValue" }],
+  });
+  let sepTxn = PT.NewSeparator({
+    parentGuid: PlacesUtils.bookmarks.unfiledGuid,
+    index: 1,
+  });
+
+  let emptyFolderTxn = PT.NewFolder(createTestFolderInfo());
+  for (let txn of [sepTxn, emptyFolderTxn]) {
+    let guid = await txn.transact();
+    await duplicate_and_test(guid);
+  }
+
+  // Test duplicating a folder having some contents.
+  let filledFolderGuid = await PT.batch(async function() {
+    let folderGuid = await PT.NewFolder(createTestFolderInfo()).transact();
+    let nestedFolderGuid = await PT.NewFolder({
+      parentGuid: folderGuid,
+      title: "Nested Folder",
+    }).transact();
+    // Insert a bookmark under the nested folder.
+    await PT.NewBookmark({
+      url: "http://nested.nested.bookmark",
+      parentGuid: nestedFolderGuid,
+    }).transact();
+    // Insert a separator below the nested folder
+    await PT.NewSeparator({ parentGuid: folderGuid }).transact();
+    // And another bookmark.
+    await PT.NewBookmark({
+      url: "http://nested.bookmark",
+      parentGuid: folderGuid,
+    }).transact();
+    return folderGuid;
+  });
+
+  await duplicate_and_test(filledFolderGuid);
+
+  // Cleanup
+  await PT.clearTransactionsHistory();
+});
+
+add_task(async function test_array_input_for_batch() {
+  let folderTxn = PT.NewFolder(createTestFolderInfo());
+  let folderGuid = await folderTxn.transact();
+
+  let sep1_txn = PT.NewSeparator({ parentGuid: folderGuid });
+  let sep2_txn = PT.NewSeparator({ parentGuid: folderGuid });
+  await PT.batch([sep1_txn, sep2_txn]);
+  ensureUndoState([[sep2_txn, sep1_txn], [folderTxn]], 0);
+
+  let ensureChildCount = async function(count) {
+    let tree = await PlacesUtils.promiseBookmarksTree(folderGuid);
+    if (count == 0) {
+      Assert.ok(!("children" in tree));
+    } else {
+      Assert.equal(tree.children.length, count);
+    }
+  };
+
+  await ensureChildCount(2);
+  await PT.undo();
+  await ensureChildCount(0);
+  await PT.redo();
+  await ensureChildCount(2);
+  await PT.undo();
+  await ensureChildCount(0);
+
+  await PT.undo();
+  Assert.equal(await PlacesUtils.promiseBookmarksTree(folderGuid), null);
+
+  // Cleanup
+  await PT.clearTransactionsHistory();
+});
+
+add_task(async function test_invalid_uri_spec_throws() {
+  Assert.throws(
+    () =>
+      PT.NewBookmark({
+        parentGuid: PlacesUtils.bookmarks.unfiledGuid,
+        url: "invalid uri spec",
+        title: "test bookmark",
+      }),
+    /invalid uri spec is not a valid URL/
+  );
+  Assert.throws(
+    () => PT.Tag({ tag: "TheTag", urls: ["invalid uri spec"] }),
+    /TypeError: URL constructor: invalid uri spec is not a valid URL/
+  );
+  Assert.throws(
+    () => PT.Tag({ tag: "TheTag", urls: ["about:blank", "invalid uri spec"] }),
+    /TypeError: URL constructor: invalid uri spec is not a valid URL/
+  );
+});
+
+add_task(async function test_remove_multiple() {
+  let guids = [];
+  await PT.batch(async function() {
+    let folderGuid = await PT.NewFolder({
+      title: "Test Folder",
+      parentGuid: menuGuid,
+    }).transact();
+    let nestedFolderGuid = await PT.NewFolder({
+      title: "Nested Test Folder",
+      parentGuid: folderGuid,
+    }).transact();
+    await PT.NewSeparator(nestedFolderGuid).transact();
+
+    guids.push(folderGuid);
+
+    let bmGuid = await PT.NewBookmark({
+      url: "http://test.bookmark.removed",
+      parentGuid: menuGuid,
+    }).transact();
+    guids.push(bmGuid);
+  });
+
+  let originalInfos = [];
+  for (let guid of guids) {
+    originalInfos.push(await PlacesUtils.promiseBookmarksTree(guid));
+  }
+
+  await PT.Remove(guids).transact();
+  await ensureNonExistent(...guids);
+  await PT.undo();
+  await ensureBookmarksTreeRestoredCorrectly(...originalInfos);
+  await PT.redo();
+  await ensureNonExistent(...guids);
+  await PT.undo();
+  await ensureBookmarksTreeRestoredCorrectly(...originalInfos);
+
+  // Undo the New* transactions batch.
+  await PT.undo();
+  await ensureNonExistent(...guids);
+
+  // Redo it.
+  await PT.redo();
+  await ensureBookmarksTreeRestoredCorrectlyExceptDates(...originalInfos);
+
+  // Redo remove.
+  await PT.redo();
+  await ensureNonExistent(...guids);
+
+  // Cleanup
+  await PT.clearTransactionsHistory();
+  observer.reset();
+});
+
+add_task(async function test_renameTag() {
+  let url = "http://test.edit.keyword/";
+  await PT.Tag({ url, tags: ["t1", "t2"] }).transact();
+  ensureTagsForURI(url, ["t1", "t2"]);
+
+  // Create bookmark queries that point to the modified tag.
+  let bm1 = await PlacesUtils.bookmarks.insert({
+    url: "place:tag=t2",
+    parentGuid: PlacesUtils.bookmarks.unfiledGuid,
+  });
+  let bm2 = await PlacesUtils.bookmarks.insert({
+    url: "place:tag=t2&sort=1",
+    parentGuid: PlacesUtils.bookmarks.unfiledGuid,
+  });
+  // This points to 2 tags, and as such won't be touched.
+  let bm3 = await PlacesUtils.bookmarks.insert({
+    url: "place:tag=t2&tag=t1",
+    parentGuid: PlacesUtils.bookmarks.unfiledGuid,
+  });
+
+  await PT.RenameTag({ oldTag: "t2", tag: "t3" }).transact();
+  ensureTagsForURI(url, ["t1", "t3"]);
+  Assert.equal(
+    (await PlacesUtils.bookmarks.fetch(bm1.guid)).url.href,
+    "place:tag=t3",
+    "The fitst bookmark has been updated"
+  );
+  Assert.equal(
+    (await PlacesUtils.bookmarks.fetch(bm2.guid)).url.href,
+    "place:tag=t3&sort=1",
+    "The second bookmark has been updated"
+  );
+  Assert.equal(
+    (await PlacesUtils.bookmarks.fetch(bm3.guid)).url.href,
+    "place:tag=t3&tag=t1",
+    "The third bookmark has been updated"
+  );
+
+  await PT.undo();
+  ensureTagsForURI(url, ["t1", "t2"]);
+  Assert.equal(
+    (await PlacesUtils.bookmarks.fetch(bm1.guid)).url.href,
+    "place:tag=t2",
+    "The fitst bookmark has been restored"
+  );
+  Assert.equal(
+    (await PlacesUtils.bookmarks.fetch(bm2.guid)).url.href,
+    "place:tag=t2&sort=1",
+    "The second bookmark has been restored"
+  );
+  Assert.equal(
+    (await PlacesUtils.bookmarks.fetch(bm3.guid)).url.href,
+    "place:tag=t2&tag=t1",
+    "The third bookmark has been restored"
+  );
+
+  await PT.redo();
+  ensureTagsForURI(url, ["t1", "t3"]);
+  Assert.equal(
+    (await PlacesUtils.bookmarks.fetch(bm1.guid)).url.href,
+    "place:tag=t3",
+    "The fitst bookmark has been updated"
+  );
+  Assert.equal(
+    (await PlacesUtils.bookmarks.fetch(bm2.guid)).url.href,
+    "place:tag=t3&sort=1",
+    "The second bookmark has been updated"
+  );
+  Assert.equal(
+    (await PlacesUtils.bookmarks.fetch(bm3.guid)).url.href,
+    "place:tag=t3&tag=t1",
+    "The third bookmark has been updated"
+  );
+
+  await PT.undo();
+  ensureTagsForURI(url, ["t1", "t2"]);
+  Assert.equal(
+    (await PlacesUtils.bookmarks.fetch(bm1.guid)).url.href,
+    "place:tag=t2",
+    "The fitst bookmark has been restored"
+  );
+  Assert.equal(
+    (await PlacesUtils.bookmarks.fetch(bm2.guid)).url.href,
+    "place:tag=t2&sort=1",
+    "The second bookmark has been restored"
+  );
+  Assert.equal(
+    (await PlacesUtils.bookmarks.fetch(bm3.guid)).url.href,
+    "place:tag=t2&tag=t1",
+    "The third bookmark has been restored"
+  );
+
+  await PT.undo();
+  ensureTagsForURI(url, []);
+
+  await PT.clearTransactionsHistory();
+  ensureUndoState();
+  await PlacesUtils.bookmarks.eraseEverything();
+});
+
+add_task(async function test_remove_invalid_url() {
+  let folderGuid = await PT.NewFolder({
+    title: "Test Folder",
+    parentGuid: menuGuid,
+  }).transact();
+
+  let guid = "invalid_____";
+  let folderedGuid = "invalid____2";
+  let url = "invalid-uri";
+  await PlacesUtils.withConnectionWrapper("test_bookmarks_remove", async db => {
+    await db.execute(
+      `
+      INSERT INTO moz_places(url, url_hash, title, rev_host, guid)
+      VALUES (:url, hash(:url), 'Invalid URI', '.', GENERATE_GUID())
+    `,
+      { url }
+    );
+    await db.execute(
+      `INSERT INTO moz_bookmarks (type, fk, parent, position, guid)
+        VALUES (:type,
+                (SELECT id FROM moz_places WHERE url = :url),
+                (SELECT id FROM moz_bookmarks WHERE guid = :parentGuid),
+                (SELECT MAX(position) + 1 FROM moz_bookmarks WHERE parent = (SELECT id FROM moz_bookmarks WHERE guid = :parentGuid)),
+                :guid)
+      `,
+      {
+        type: PlacesUtils.bookmarks.TYPE_BOOKMARK,
+        url,
+        parentGuid: PlacesUtils.bookmarks.unfiledGuid,
+        guid,
+      }
+    );
+    await db.execute(
+      `INSERT INTO moz_bookmarks (type, fk, parent, position, guid)
+        VALUES (:type,
+                (SELECT id FROM moz_places WHERE url = :url),
+                (SELECT id FROM moz_bookmarks WHERE guid = :parentGuid),
+                (SELECT MAX(position) + 1 FROM moz_bookmarks WHERE parent = (SELECT id FROM moz_bookmarks WHERE guid = :parentGuid)),
+                :guid)
+      `,
+      {
+        type: PlacesUtils.bookmarks.TYPE_BOOKMARK,
+        url,
+        parentGuid: folderGuid,
+        guid: folderedGuid,
+      }
+    );
+  });
+
+  let guids = [folderGuid, guid];
+  await PT.Remove(guids).transact();
+  await ensureNonExistent(...guids, folderedGuid);
+  // Shouldn't throw, should restore the folder but not the bookmarks.
+  await PT.undo();
+  await ensureNonExistent(guid, folderedGuid);
+  Assert.ok(
+    await PlacesUtils.bookmarks.fetch(folderGuid),
+    "The folder should have been re-created"
+  );
+  await PT.redo();
+  await ensureNonExistent(guids, folderedGuid);
+  // Cleanup
+  await PT.clearTransactionsHistory();
+  observer.reset();
+});