1 files changed, 84 insertions, 0 deletions
diff --git a/uriloader/exthandler/tests/unit/head.js b/uriloader/exthandler/tests/unit/head.js
new file mode 100644
index 0000000000..72d1ac87c5
--- /dev/null
+++ b/uriloader/exthandler/tests/unit/head.js
@@ -0,0 +1,84 @@
+/* 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/. */
+
+/*
+ * Initialization for tests related to invoking external handler applications.
+ */
+
+"use strict";
+
+var { AppConstants } = ChromeUtils.importESModule(
+  "resource://gre/modules/AppConstants.sys.mjs"
+);
+var { FileUtils } = ChromeUtils.importESModule(
+  "resource://gre/modules/FileUtils.sys.mjs"
+);
+var { NetUtil } = ChromeUtils.importESModule(
+  "resource://gre/modules/NetUtil.sys.mjs"
+);
+var { XPCOMUtils } = ChromeUtils.importESModule(
+  "resource://gre/modules/XPCOMUtils.sys.mjs"
+);
+
+const { HandlerServiceTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/HandlerServiceTestUtils.sys.mjs"
+);
+var { TestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/TestUtils.sys.mjs"
+);
+
+XPCOMUtils.defineLazyServiceGetter(
+  this,
+  "gHandlerService",
+  "@mozilla.org/uriloader/handler-service;1",
+  "nsIHandlerService"
+);
+
+do_get_profile();
+
+let jsonPath = PathUtils.join(PathUtils.profileDir, "handlers.json");
+
+/**
+ * Unloads the nsIHandlerService data store, so the back-end file can be
+ * accessed or modified, and the new data will be loaded at the next access.
+ */
+let unloadHandlerStore = async function () {
+  // If this function is called before the nsIHandlerService instance has been
+  // initialized for the first time, the observer below will not be registered.
+  // We have to force initialization to prevent the function from stalling.
+  gHandlerService;
+
+  let promise = TestUtils.topicObserved("handlersvc-json-replace-complete");
+  Services.obs.notifyObservers(null, "handlersvc-json-replace");
+  await promise;
+};
+
+/**
+ * Unloads the data store and deletes it.
+ */
+let deleteHandlerStore = async function () {
+  await unloadHandlerStore();
+
+  await IOUtils.remove(jsonPath, { ignoreAbsent: true });
+
+  Services.prefs.clearUserPref("gecko.handlerService.defaultHandlersVersion");
+};
+
+/**
+ * Unloads the data store and replaces it with the test data file.
+ */
+let copyTestDataToHandlerStore = async function () {
+  await unloadHandlerStore();
+
+  await IOUtils.copy(do_get_file("handlers.json").path, jsonPath);
+
+  Services.prefs.setIntPref("gecko.handlerService.defaultHandlersVersion", 100);
+};
+
+/**
+ * Ensures the files are removed and the services unloaded when the tests end.
+ */
+registerCleanupFunction(async function test_terminate() {
+  await deleteHandlerStore();
+});