diff -r 000000000000 -r 6474c204b198 testing/mozbase/mozprocess/tests/test_mozprocess_params.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/testing/mozbase/mozprocess/tests/test_mozprocess_params.py	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,86 @@
+#!/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 unittest
+from mozprocess import processhandler
+
+class ParamTests(unittest.TestCase):
+
+
+    def test_process_outputline_handler(self):
+        """Parameter processOutputLine is accepted with a single function"""
+        def output(line):
+            print("output " + str(line))
+        err = None
+        try:
+            p = processhandler.ProcessHandler(['ls','-l'], processOutputLine=output)
+        except (TypeError, AttributeError) as e:
+            err = e
+        self.assertFalse(err)
+
+    def test_process_outputline_handler_list(self):
+        """Parameter processOutputLine is accepted with a list of functions"""
+        def output(line):
+            print("output " + str(line))
+        err = None
+        try:
+            p = processhandler.ProcessHandler(['ls','-l'], processOutputLine=[output])
+        except (TypeError, AttributeError) as e:
+            err = e
+        self.assertFalse(err)
+
+
+    def test_process_ontimeout_handler(self):
+        """Parameter onTimeout is accepted with a single function"""
+        def timeout():
+            print("timeout!")
+        err = None
+        try:
+            p = processhandler.ProcessHandler(['sleep', '2'], onTimeout=timeout)
+        except (TypeError, AttributeError) as e:
+            err = e
+        self.assertFalse(err)
+
+    def test_process_ontimeout_handler_list(self):
+        """Parameter onTimeout is accepted with a list of functions"""
+        def timeout():
+            print("timeout!")
+        err = None
+        try:
+            p = processhandler.ProcessHandler(['sleep', '2'], onTimeout=[timeout])
+        except (TypeError, AttributeError) as e:
+            err = e
+        self.assertFalse(err)
+
+    def test_process_onfinish_handler(self):
+        """Parameter onFinish is accepted with a single function"""
+        def finish():
+            print("finished!")
+        err = None
+        try:
+            p = processhandler.ProcessHandler(['sleep', '1'], onFinish=finish)
+        except (TypeError, AttributeError) as e:
+            err = e
+        self.assertFalse(err)
+
+    def test_process_onfinish_handler_list(self):
+        """Parameter onFinish is accepted with a list of functions"""
+        def finish():
+            print("finished!")
+        err = None
+        try:
+            p = processhandler.ProcessHandler(['sleep', '1'], onFinish=[finish])
+        except (TypeError, AttributeError) as e:
+            err = e
+        self.assertFalse(err)
+
+
+def main():
+    unittest.main()
+
+if __name__ == '__main__':
+    main()
+