Issue 4223 - Migrate some more of adblockplustests

test/stub-modules/common.js

+let {FilterStorage} = require("filterStorage");
+let {Subscription} = require("subscriptionClasses");
+let {Filter} = require("filterClasses");
+let {ElemHide} = require("elemHide");
+let {defaultMatcher} = require("matcher");
+let {CSSRules} = require("cssRules");
+let {FilterNotifier} = require("filterNotifier");
+let {Prefs} = require("prefs");
+
+exports.prepareFilterComponents = function(keepListeners)
+{
+  this._backup = {
+    subscriptions: FilterStorage.subscriptions,
+    storageKnown: FilterStorage.knownSubscriptions,
+    subscriptionsKnown: Subscription.knownSubscriptions,
+    filtersKnown: Filter.knownFilters,
+    listeners: FilterNotifier._listeners,
+    sourceFile: FilterStorage.sourceFile
+  };
+
+  FilterStorage.subscriptions = [];
+  FilterStorage.knownSubscriptions = Object.create(null);
+  Subscription.knownSubscriptions = Object.create(null);
+  Filter.knownFilters = Object.create(null);
+  if (!keepListeners)
+    FilterNotifier._listeners = {};
+
+  defaultMatcher.clear();
+  ElemHide.clear();
+  CSSRules.clear();
+};
+
+exports.restoreFilterComponents = function()
+{
+  FilterStorage.subscriptions = this._backup.subscriptions;
+  FilterStorage.knownSubscriptions = this._backup.storageKnown;
+  Subscription.knownSubscriptions = this._backup.subscriptionsKnown;
+  Filter.knownFilters = this._backup.filtersKnown;
+  FilterNotifier._listeners = this._backup.listeners;
+  Object.defineProperty(FilterStorage, "sourceFile",
+                        {value: this._backup.sourceFile, configurable: true});
+
+  FilterNotifier.triggerListeners("load");
+};
+
+exports.preparePrefs = function()
+{
+  this._pbackup = Object.create(null);
+  for (let pref in Prefs)
+  {
+    if (Prefs.__lookupSetter__(pref))
+      this._pbackup[pref] = Prefs[pref];
+  }
+  Prefs.enabled = true;
+};
+
+exports.restorePrefs = function()
+{
+  for (let pref in this._pbackup)
+    Prefs[pref] = this._pbackup[pref];
+};