1 files changed, 38 insertions, 0 deletions
diff --git a/toolkit/modules/tests/browser/browser_PromiseMessage.js b/toolkit/modules/tests/browser/browser_PromiseMessage.js
new file mode 100644
index 000000000..e967ac4c9
--- /dev/null
+++ b/toolkit/modules/tests/browser/browser_PromiseMessage.js
@@ -0,0 +1,38 @@
+/* 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/. */
+/* global Cu, BrowserTestUtils, is, ok, add_task, gBrowser */
+"use strict";
+Cu.import("resource://gre/modules/PromiseMessage.jsm", this);
+
+
+const url = "http://example.org/tests/dom/manifest/test/resource.sjs";
+
+/**
+ * Test basic API error conditions
+ */
+add_task(function* () {
+  yield BrowserTestUtils.withNewTab({gBrowser, url}, testPromiseMessageAPI)
+});
+
+function* testPromiseMessageAPI(aBrowser) {
+  // Reusing an existing message.
+  const msgKey = "DOM:WebManifest:hasManifestLink";
+  const mm = aBrowser.messageManager;
+  const id = "this should not change";
+  const foo = "neitherShouldThis";
+  const data = {id, foo};
+
+  // This just returns false, and it doesn't matter for this test.
+  yield PromiseMessage.send(mm, msgKey, data);
+
+  // Check that no new props were added
+  const props = Object.getOwnPropertyNames(data);
+  ok(props.length === 2, "There should only be 2 props");
+  ok(props.includes("id"), "Has the id property");
+  ok(props.includes("foo"), "Has the foo property");
+
+  // Check that the props didn't change.
+  is(data.id, id, "The id prop must not change.");
+  is(data.foo, foo, "The foo prop must not change.");
+}