diff -r 000000000000 -r 6474c204b198 testing/mozbase/mozrunner/tests/test_stop.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/testing/mozbase/mozrunner/tests/test_stop.py	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,40 @@
+#!/usr/bin/env python
+# 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/.
+
+import os
+import signal
+
+import mozrunnertest
+
+
+class MozrunnerStopTestCase(mozrunnertest.MozrunnerTestCase):
+
+    def test_stop_process(self):
+        """Stop the process and test properties"""
+        self.runner.start()
+        returncode = self.runner.stop()
+
+        self.assertFalse(self.runner.is_running())
+        self.assertNotIn(returncode, [None, 0])
+        self.assertEqual(self.runner.returncode, returncode)
+        self.assertIsNotNone(self.runner.process_handler)
+
+        self.assertEqual(self.runner.wait(1), returncode)
+
+    def test_stop_before_start(self):
+        """Stop the process before it gets started should not raise an error"""
+        returncode = self.runner.stop()
+
+    def test_stop_process_custom_signal(self):
+        """Stop the process via a custom signal and test properties"""
+        self.runner.start()
+        returncode = self.runner.stop(signal.SIGTERM)
+
+        self.assertFalse(self.runner.is_running())
+        self.assertNotIn(returncode, [None, 0])
+        self.assertEqual(self.runner.returncode, returncode)
+        self.assertIsNotNone(self.runner.process_handler)
+
+        self.assertEqual(self.runner.wait(1), returncode)