1 files changed, 92 insertions, 0 deletions
diff --git a/services/sync/tests/unit/test_prefs_tracker.js b/services/sync/tests/unit/test_prefs_tracker.js
new file mode 100644
index 0000000000..9840d287b9
--- /dev/null
+++ b/services/sync/tests/unit/test_prefs_tracker.js
@@ -0,0 +1,92 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const { Preferences } = ChromeUtils.importESModule(
+  "resource://gre/modules/Preferences.sys.mjs"
+);
+const { Service } = ChromeUtils.importESModule(
+  "resource://services-sync/service.sys.mjs"
+);
+
+add_task(async function run_test() {
+  let engine = Service.engineManager.get("prefs");
+  let tracker = engine._tracker;
+
+  let prefs = new Preferences();
+
+  try {
+    _("tracker.modified corresponds to preference.");
+    Assert.equal(Svc.Prefs.get("engine.prefs.modified"), undefined);
+    Assert.ok(!tracker.modified);
+
+    tracker.modified = true;
+    Assert.equal(Svc.Prefs.get("engine.prefs.modified"), true);
+    Assert.ok(tracker.modified);
+
+    _("Engine's getChangedID() just returns the one GUID we have.");
+    let changedIDs = await engine.getChangedIDs();
+    let ids = Object.keys(changedIDs);
+    Assert.equal(ids.length, 1);
+    Assert.equal(ids[0], CommonUtils.encodeBase64URL(Services.appinfo.ID));
+
+    Svc.Prefs.set("engine.prefs.modified", false);
+    Assert.ok(!tracker.modified);
+
+    _("No modified state, so no changed IDs.");
+    do_check_empty(await engine.getChangedIDs());
+
+    _("Initial score is 0");
+    Assert.equal(tracker.score, 0);
+
+    _("Test fixtures.");
+    Svc.Prefs.set("prefs.sync.testing.int", true);
+
+    _(
+      "Test fixtures haven't upped the tracker score yet because it hasn't started tracking yet."
+    );
+    Assert.equal(tracker.score, 0);
+
+    _("Tell the tracker to start tracking changes.");
+    tracker.start();
+    prefs.set("testing.int", 23);
+    await tracker.asyncObserver.promiseObserversComplete();
+    Assert.equal(tracker.score, SCORE_INCREMENT_XLARGE);
+    Assert.equal(tracker.modified, true);
+
+    _("Clearing changed IDs reset modified status.");
+    await tracker.clearChangedIDs();
+    Assert.equal(tracker.modified, false);
+
+    _("Resetting a pref ups the score, too.");
+    prefs.reset("testing.int");
+    await tracker.asyncObserver.promiseObserversComplete();
+    Assert.equal(tracker.score, SCORE_INCREMENT_XLARGE * 2);
+    Assert.equal(tracker.modified, true);
+    await tracker.clearChangedIDs();
+
+    _("So does changing a pref sync pref.");
+    Svc.Prefs.set("prefs.sync.testing.int", false);
+    await tracker.asyncObserver.promiseObserversComplete();
+    Assert.equal(tracker.score, SCORE_INCREMENT_XLARGE * 3);
+    Assert.equal(tracker.modified, true);
+    await tracker.clearChangedIDs();
+
+    _(
+      "Now that the pref sync pref has been flipped, changes to it won't be picked up."
+    );
+    prefs.set("testing.int", 42);
+    await tracker.asyncObserver.promiseObserversComplete();
+    Assert.equal(tracker.score, SCORE_INCREMENT_XLARGE * 3);
+    Assert.equal(tracker.modified, false);
+    await tracker.clearChangedIDs();
+
+    _("Changing some other random pref won't do anything.");
+    prefs.set("testing.other", "blergh");
+    await tracker.asyncObserver.promiseObserversComplete();
+    Assert.equal(tracker.score, SCORE_INCREMENT_XLARGE * 3);
+    Assert.equal(tracker.modified, false);
+  } finally {
+    await tracker.stop();
+    prefs.resetBranch("");
+  }
+});