import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

toolkit/components/filewatcher/tests/xpcshell/test_watch_resource.js

@@ -0,0 +1,32 @@
+/* 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";
+
+function run_test() {
+  // Set up profile. We will use profile path create some test files
+  do_get_profile();
+
+  // Start executing the tests
+  run_next_test();
+}
+
+/**
+ * Test watching non-existing path
+ */
+add_task(function* test_watching_non_existing() {
+  let notExistingDir =
+    OS.Path.join(OS.Constants.Path.profileDir, "absolutelyNotExisting");
+
+  // Instantiate the native watcher.
+  let watcher = makeWatcher();
+  let deferred = Promise.defer();
+
+  // Try watch a path which doesn't exist.
+  watcher.addPath(notExistingDir, deferred.reject, deferred.resolve);
+
+  // Wait until the watcher informs us that there was an error.
+  let error = yield deferred.promise;
+  do_check_eq(error, Components.results.NS_ERROR_FILE_NOT_FOUND);
+});