1 files changed, 67 insertions, 0 deletions
diff --git a/toolkit/components/extensions/test/xpcshell/head_sync.js b/toolkit/components/extensions/test/xpcshell/head_sync.js
new file mode 100644
index 000000000..9b66b78e7
--- /dev/null
+++ b/toolkit/components/extensions/test/xpcshell/head_sync.js
@@ -0,0 +1,67 @@
+/* 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/. */
+
+"use strict";
+
+/* exported withSyncContext */
+
+Components.utils.import("resource://gre/modules/Services.jsm", this);
+Components.utils.import("resource://gre/modules/ExtensionCommon.jsm", this);
+
+var {
+  BaseContext,
+} = ExtensionCommon;
+
+class Context extends BaseContext {
+  constructor(principal) {
+    super();
+    Object.defineProperty(this, "principal", {
+      value: principal,
+      configurable: true,
+    });
+    this.sandbox = Components.utils.Sandbox(principal, {wantXrays: false});
+    this.extension = {id: "test@web.extension"};
+  }
+
+  get cloneScope() {
+    return this.sandbox;
+  }
+}
+
+/**
+ * Call the given function with a newly-constructed context.
+ * Unload the context on the way out.
+ *
+ * @param {function} f    the function to call
+ */
+function* withContext(f) {
+  const ssm = Services.scriptSecurityManager;
+  const PRINCIPAL1 = ssm.createCodebasePrincipalFromOrigin("http://www.example.org");
+  const context = new Context(PRINCIPAL1);
+  try {
+    yield* f(context);
+  } finally {
+    yield context.unload();
+  }
+}
+
+/**
+ * Like withContext(), but also turn on the "storage.sync" pref for
+ * the duration of the function.
+ * Calls to this function can be replaced with calls to withContext
+ * once the pref becomes on by default.
+ *
+ * @param {function} f    the function to call
+ */
+function* withSyncContext(f) {
+  const STORAGE_SYNC_PREF = "webextensions.storage.sync.enabled";
+  let prefs = Services.prefs;
+
+  try {
+    prefs.setBoolPref(STORAGE_SYNC_PREF, true);
+    yield* withContext(f);
+  } finally {
+    prefs.clearUserPref(STORAGE_SYNC_PREF);
+  }
+}