Capture server logs when running notebook tests

IPython/html/tests/launchnotebook.py

@@ -1,13 +1,14 b''
 """Base class for notebook tests."""
 
-import os
 import sys
 import time
 import requests
 from contextlib import contextmanager
-from subprocess import Popen, PIPE
+from subprocess import Popen, STDOUT
 from unittest import TestCase
 
+import nose
+
 from IPython.utils.tempdir import TemporaryDirectory
 
 class NotebookTestBase(TestCase):
@@ -55,11 +56,11 b' class NotebookTestBase(TestCase):'
             '--ipython-dir=%s' % cls.ipython_dir.name,
             '--notebook-dir=%s' % cls.notebook_dir.name,
         ]
-        devnull = open(os.devnull, 'w')
         cls.notebook = Popen(notebook_args,
-            stdout=devnull,
-            stderr=devnull,
+            stdout=nose.ipy_stream_capturer.writefd,
+            stderr=STDOUT,
         )
+        nose.ipy_stream_capturer.ensure_started()
         cls.wait_until_alive()
 
     @classmethod