Disable the pager for the test suite.

closes gh-949
closes gh-961

IPython/core/tests/test_page.py

@@ -7,6 +7,7 b''
 #-----------------------------------------------------------------------------
 import io
 
+# N.B. For the test suite, page.page is overridden (see IPython.testing.globalipapp)
 from IPython.core import page
 
 def test_detect_screen_size():

IPython/testing/globalipapp.py

@@ -27,6 +27,7 b' import sys'
 # our own
 from . import tools
 
+from IPython.core import page
 from IPython.utils import io
 from IPython.utils import py3compat
 from IPython.frontend.terminal.interactiveshell import TerminalInteractiveShell
@@ -228,5 +229,12 b' def start_ipython():'
     # To avoid extra IPython messages during testing, suppress io.stdout/stderr
     io.stdout = StreamProxy('stdout')
     io.stderr = StreamProxy('stderr')
+    
+    # Override paging, so we don't require user interaction during the tests.
+    def nopage(strng, start=0, screen_lines=0, pager_cmd=None):
+        print(strng)
+    
+    page.orig_page = page.page
+    page.page = nopage
 
     return _ip