1 files changed, 120 insertions, 0 deletions
diff --git a/services/sync/modules-testing/rotaryengine.sys.mjs b/services/sync/modules-testing/rotaryengine.sys.mjs
new file mode 100644
index 0000000000..d7f2165e4d
--- /dev/null
+++ b/services/sync/modules-testing/rotaryengine.sys.mjs
@@ -0,0 +1,120 @@
+/* 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/. */
+
+import {
+  Store,
+  SyncEngine,
+  LegacyTracker,
+} from "resource://services-sync/engines.sys.mjs";
+
+import { CryptoWrapper } from "resource://services-sync/record.sys.mjs";
+import { SerializableSet, Utils } from "resource://services-sync/util.sys.mjs";
+
+/*
+ * A fake engine implementation.
+ * This is used all over the place.
+ *
+ * Complete with record, store, and tracker implementations.
+ */
+
+export function RotaryRecord(collection, id) {
+  CryptoWrapper.call(this, collection, id);
+}
+
+RotaryRecord.prototype = {};
+Object.setPrototypeOf(RotaryRecord.prototype, CryptoWrapper.prototype);
+Utils.deferGetSet(RotaryRecord, "cleartext", ["denomination"]);
+
+export function RotaryStore(name, engine) {
+  Store.call(this, name, engine);
+  this.items = {};
+}
+
+RotaryStore.prototype = {
+  async create(record) {
+    this.items[record.id] = record.denomination;
+  },
+
+  async remove(record) {
+    delete this.items[record.id];
+  },
+
+  async update(record) {
+    this.items[record.id] = record.denomination;
+  },
+
+  async itemExists(id) {
+    return id in this.items;
+  },
+
+  async createRecord(id, collection) {
+    let record = new RotaryRecord(collection, id);
+
+    if (!(id in this.items)) {
+      record.deleted = true;
+      return record;
+    }
+
+    record.denomination = this.items[id] || "Data for new record: " + id;
+    return record;
+  },
+
+  async changeItemID(oldID, newID) {
+    if (oldID in this.items) {
+      this.items[newID] = this.items[oldID];
+    }
+
+    delete this.items[oldID];
+  },
+
+  async getAllIDs() {
+    let ids = {};
+    for (let id in this.items) {
+      ids[id] = true;
+    }
+    return ids;
+  },
+
+  async wipe() {
+    this.items = {};
+  },
+};
+
+Object.setPrototypeOf(RotaryStore.prototype, Store.prototype);
+
+export function RotaryTracker(name, engine) {
+  LegacyTracker.call(this, name, engine);
+}
+
+RotaryTracker.prototype = {};
+Object.setPrototypeOf(RotaryTracker.prototype, LegacyTracker.prototype);
+
+export function RotaryEngine(service) {
+  SyncEngine.call(this, "Rotary", service);
+  // Ensure that the engine starts with a clean slate.
+  this.toFetch = new SerializableSet();
+  this.previousFailed = new SerializableSet();
+}
+
+RotaryEngine.prototype = {
+  _storeObj: RotaryStore,
+  _trackerObj: RotaryTracker,
+  _recordObj: RotaryRecord,
+
+  async _findDupe(item) {
+    // This is a Special Value® used for testing proper reconciling on dupe
+    // detection.
+    if (item.id == "DUPE_INCOMING") {
+      return "DUPE_LOCAL";
+    }
+
+    for (let [id, value] of Object.entries(this._store.items)) {
+      if (item.denomination == value) {
+        return id;
+      }
+    }
+    return null;
+  },
+};
+Object.setPrototypeOf(RotaryEngine.prototype, SyncEngine.prototype);