Use stream capturer for kernel tests

IPython/kernel/tests/utils.py

@@ -14,9 +14,10 b''
 import atexit
 
 from contextlib import contextmanager
-from subprocess import PIPE
+from subprocess import PIPE, STDOUT
 from Queue import Empty
 
+import nose
 import nose.tools as nt
 
 from IPython.kernel import KernelManager
@@ -39,10 +40,12 b' KC = None'
 def start_new_kernel(argv=None):
     """start a new kernel, and return its Manager and Client"""
     km = KernelManager()
-    kwargs = dict(stdout=PIPE, stderr=PIPE)
+    kwargs = dict(stdout=PIPE, stderr=STDOUT)
     if argv:
         kwargs['extra_arguments'] = argv
     km.start_kernel(**kwargs)
+    nose.ipy_stream_capturer.add_stream(km.kernel.stdout.fileno())
+    nose.ipy_stream_capturer.ensure_started()
     kc = km.client()
     kc.start_channels()