Issue 4223 - Migrate some more of adblockplustests

test/filterNotifier.js

Index: test/filterNotifier.js
diff --git a/test/filterNotifier.js b/test/filterNotifier.js
new file mode 100644
index 0000000000000000000000000000000000000000..44d644b09cfdbcb0f891aacc2c80d194207b351a
--- /dev/null
+++ b/test/filterNotifier.js
@@ -0,0 +1,107 @@
+/*
+ * This file is part of Adblock Plus <https://adblockplus.org/>,
+ * Copyright (C) 2006-2016 Eyeo GmbH
+ *
+ * Adblock Plus is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 3 as
+ * published by the Free Software Foundation.
+ *
+ * Adblock Plus is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+"use strict";
+
+let {createSandbox} = require("./_common");
+
+let FilterNotifier = null;
+
+exports.setUp = function(callback)
+{
+  let sandboxedRequire = createSandbox();
+  (
+    {FilterNotifier} = sandboxedRequire("../lib/filterNotifier")
+  );
+
+  callback();
+};
+
+let triggeredListeners = [];
+let listeners = [
+  (action, item) => triggeredListeners.push(["listener1", action, item]),
+  (action, item) => triggeredListeners.push(["listener2", action, item]),
+  (action, item) => triggeredListeners.push(["listener3", action, item])
+];
+
+function compareListeners(test, testDescription, list)
+{
+  let result1 = triggeredListeners = [];
+  FilterNotifier.triggerListeners("foo", {bar: true});
+
+  let result2 = triggeredListeners = [];
+  for (let observer of list)
+    observer("foo", {bar: true});
+
+  test.deepEqual(result1, result2, testDescription);
+}
+
+exports.testAddingRemovingListeners = function(test)
+{
+  let [listener1, listener2, listener3] = listeners;
+
+  compareListeners(test, "No listeners", []);
+
+  FilterNotifier.addListener(listener1);
+  compareListeners(test, "addListener(listener1)", [listener1]);
+
+  FilterNotifier.addListener(listener1);
+  compareListeners(test, "addListener(listener1) again", [listener1]);
+
+  FilterNotifier.addListener(listener2);
+  compareListeners(test, "addListener(listener2)", [listener1, listener2]);
+
+  FilterNotifier.removeListener(listener1);
+  compareListeners(test, "removeListener(listener1)", [listener2]);
+
+  FilterNotifier.removeListener(listener1);
+  compareListeners(test, "removeListener(listener1) again", [listener2]);
+
+  FilterNotifier.addListener(listener3);
+  compareListeners(test, "addListener(listener3)", [listener2, listener3]);
+
+  FilterNotifier.addListener(listener1);
+  compareListeners(test, "addListener(listener1)", [listener2, listener3, listener1]);
+
+  FilterNotifier.removeListener(listener3);
+  compareListeners(test, "removeListener(listener3)", [listener2, listener1]);
+
+  FilterNotifier.removeListener(listener1);
+  compareListeners(test, "removeListener(listener1)", [listener2]);
+
+  FilterNotifier.removeListener(listener2);
+  compareListeners(test, "removeListener(listener2)", []);
+
+  test.done();
+};
+
+exports.testRemovingListenersWhileBeingCalled = function(test)
+{
+  let listener1 = function()
+  {
+    listeners[0].apply(this, arguments);
+    FilterNotifier.removeListener(listener1);
+  };
+  let listener2 = listeners[1];
+  FilterNotifier.addListener(listener1);
+  FilterNotifier.addListener(listener2);
+
+  compareListeners(test, "Initial call", [listener1, listener2]);
+  compareListeners(test, "Subsequent calls", [listener2]);
+
+  test.done();
+};