Bug 931722 - Part 3: Add test cases for call mute test. r=hsinyi

dom/telephony/test/marionette/manifest.ini

@@ -44,3 +44,4 @@ disabled = Bug 821958
 [test_emergency_label.js]
 [test_conference.js]
 [test_dsds_default_service_id.js]
+[test_call_mute.js]

dom/telephony/test/marionette/test_call_mute.js

@@ -0,0 +1,21 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+MARIONETTE_TIMEOUT = 60000;
+MARIONETTE_HEAD_JS = 'head.js';
+
+function test_call_mute() {
+  telephony.muted = true;
+  is(telephony.muted, true);
+  telephony.muted = false;
+  is(telephony.muted, false);
+  cleanUp();
+}
+
+function cleanUp() {
+  finish();
+}
+
+startTest(function() {
+  test_call_mute();
+});