diff -r 000000000000 -r 6474c204b198 testing/mozbase/mozprocess/tests/test_mozprocess_output.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/testing/mozbase/mozprocess/tests/test_mozprocess_output.py	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,68 @@
+#!/usr/bin/env python
+
+import io
+import os
+import unittest
+import proctest
+from mozprocess import processhandler
+
+here = os.path.dirname(os.path.abspath(__file__))
+
+class ProcTestOutput(proctest.ProcTest):
+    """ Class to test operations related to output handling """
+
+    def test_process_output_nonewline(self):
+        """
+        Process is started, outputs data with no newline
+        """
+        p = processhandler.ProcessHandler([self.python, "procnonewline.py"],
+                                          cwd=here)
+
+        p.run()
+        p.processOutput(timeout=5)
+        p.wait()
+
+        detected, output = proctest.check_for_process("procnonewline.py")
+        self.determine_status(detected,
+                              output,
+                              p.proc.returncode,
+                              p.didTimeout,
+                              False,
+                              ())
+
+    def test_stream_process_output(self):
+        """
+        Process output stream does not buffer
+        """
+        expected = '\n'.join([str(n) for n in range(0,10)])
+
+        stream = io.BytesIO()
+        buf = io.BufferedRandom(stream)
+
+        p = processhandler.ProcessHandler([self.python, "proccountfive.py"],
+                                          cwd=here,
+                                          stream=buf)
+
+        p.run()
+        p.wait()
+        for i in range(5, 10):
+            stream.write(str(i)+'\n')
+
+        buf.flush()
+        self.assertEquals(stream.getvalue().strip(), expected)
+
+        # make sure mozprocess doesn't close the stream
+        # since mozprocess didn't create it
+        self.assertFalse(buf.closed)
+        buf.close()
+
+        detected, output = proctest.check_for_process("proccountfive.py")
+        self.determine_status(detected,
+                              output,
+                              p.proc.returncode,
+                              p.didTimeout,
+                              False,
+                              ())
+
+if __name__ == '__main__':
+    unittest.main()