Apparently output goes to stderr?

tests/test_upload.py

@@ -1,22 +0,0 @@
-#!/usr/bin/env python
-
-import subprocess
-import glob
-
-def test_push():
-    for fname in glob.glob("*.xml"):
-        proc = subprocess.Popen([
-                        "taxii-push", 
-                        "--path", "http://127.0.0.1:9000/services/inbox", 
-                        "-f", fname, 
-                        "--dest", "collection", 
-                        "--username", "travis", 
-                        "--password", "travis"
-                    ],
-                    stdout=subprocess.PIPE,
-                    stderr=subprocess.PIPE
-                )
-
-        out,err = proc.communicate()
-        print(out)
-        assert("Content block successfully pushed" in out.decode("utf-8"))