diff -r 000000000000 -r 6474c204b198 testing/mozbase/mozrunner/tests/test_start.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/testing/mozbase/mozrunner/tests/test_start.py	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,47 @@
+#!/usr/bin/env python
+
+import os
+from time import sleep
+import unittest
+
+import mozrunnertest
+
+
+class MozrunnerStartTestCase(mozrunnertest.MozrunnerTestCase):
+
+    def test_start_process(self):
+        """Start the process and test properties"""
+        self.assertIsNone(self.runner.process_handler)
+
+        self.runner.start()
+
+        self.assertTrue(self.runner.is_running())
+        self.assertIsNotNone(self.runner.process_handler)
+
+    def test_start_process_called_twice(self):
+        """Start the process twice and test that first process is gone"""
+        pid1 = self.runner.start()
+        # Bug 925480
+        # Make a copy until mozprocess can kill a specific process
+        process_handler = self.runner.process_handler
+
+        pid2 = self.runner.start()
+
+        try:
+            self.assertNotIn(process_handler.wait(1), [None, 0])
+        finally:
+            process_handler.kill()
+
+    def test_start_with_timeout(self):
+        """Start the process and set a timeout"""
+        self.runner.start(timeout=2)
+        sleep(5)
+
+        self.assertFalse(self.runner.is_running())
+
+    def test_start_with_outputTimeout(self):
+        """Start the process and set a timeout"""
+        self.runner.start(outputTimeout=2)
+        sleep(5)
+
+        self.assertFalse(self.runner.is_running())