Added missing imports for test

IPython/core/tests/test_displayhook.py

@@ -1,111 +1,114 b''
+import sys
 from IPython.testing.tools import AssertPrints, AssertNotPrints
+from IPython.core.displayhook import CapturingDisplayHook
+from IPython.utils.capture import CapturedIO
 
 ip = get_ipython()
 
 def test_output_displayed():
     """Checking to make sure that output is displayed"""
   
     with AssertPrints('2'):
        ip.run_cell('1+1', store_history=True)
       
     with AssertPrints('2'):
         ip.run_cell('1+1 # comment with a semicolon;', store_history=True)
 
     with AssertPrints('2'):
         ip.run_cell('1+1\n#commented_out_function();', store_history=True)
 
       
 def test_output_quiet():
     """Checking to make sure that output is quiet"""
   
     with AssertNotPrints('2'):
         ip.run_cell('1+1;', store_history=True)
       
     with AssertNotPrints('2'):
         ip.run_cell('1+1; # comment with a semicolon', store_history=True)
 
     with AssertNotPrints('2'):
         ip.run_cell('1+1;\n#commented_out_function()', store_history=True)
 
 def test_underscore_no_overrite_user():
     ip.run_cell('_ = 42', store_history=True)
     ip.run_cell('1+1', store_history=True)
 
     with AssertPrints('42'):
         ip.run_cell('print(_)', store_history=True)
 
     ip.run_cell('del _', store_history=True)
     ip.run_cell('6+6', store_history=True)
     with AssertPrints('12'):
         ip.run_cell('_', store_history=True)
 
 
 def test_underscore_no_overrite_builtins():
     ip.run_cell("import gettext ; gettext.install('foo')", store_history=True)
     ip.run_cell('3+3', store_history=True)
 
     with AssertPrints('gettext'):
         ip.run_cell('print(_)', store_history=True)
 
     ip.run_cell('_ = "userset"', store_history=True)
 
     with AssertPrints('userset'):
         ip.run_cell('print(_)', store_history=True)
     ip.run_cell('import builtins; del builtins._')
 
 
 def test_interactivehooks_ast_modes():
     """
     Test that ast nodes can be triggered with different modes
     """
     saved_mode = ip.ast_node_interactivity
     ip.ast_node_interactivity = 'last_expr_or_assign'
 
     try:
         with AssertPrints('2'):
             ip.run_cell('a = 1+1', store_history=True)
 
         with AssertPrints('9'):
             ip.run_cell('b = 1+8 # comment with a semicolon;', store_history=False)
 
         with AssertPrints('7'):
             ip.run_cell('c = 1+6\n#commented_out_function();', store_history=True)
 
         ip.run_cell('d = 11', store_history=True)
         with AssertPrints('12'):
             ip.run_cell('d += 1', store_history=True)
 
         with AssertNotPrints('42'):
             ip.run_cell('(u,v) = (41+1, 43-1)')
 
     finally:
         ip.ast_node_interactivity = saved_mode
 
 def test_interactivehooks_ast_modes_semi_supress():
     """
     Test that ast nodes can be triggered with different modes and suppressed
     by semicolon
     """
     saved_mode = ip.ast_node_interactivity
     ip.ast_node_interactivity = 'last_expr_or_assign'
 
     try:
         with AssertNotPrints('2'):
             ip.run_cell('x = 1+1;', store_history=True)
 
         with AssertNotPrints('7'):
             ip.run_cell('y = 1+6; # comment with a semicolon', store_history=True)
 
         with AssertNotPrints('9'):
             ip.run_cell('z = 1+8;\n#commented_out_function()', store_history=True)
 
     finally:
         ip.ast_node_interactivity = saved_mode
 
 def test_capture_display_hook_format():
     """Tests that the capture display hook conforms to the CapturedIO output format"""
     hook = CapturingDisplayHook(ip)
     hook({"foo": "bar"})
     captured = CapturedIO(sys.stdout, sys.stderr, hook.outputs)
     # Should not raise with RichOutput transformation error
     captured.outputs