make the tests fail correctly

IPython/core/tests/test_displayhook.py

@@ -1,19 +1,21
 from IPython.testing.tools import AssertPrints, AssertNotPrints
 
+ip = get_ipython()
+
 def test_output_displayed():
     """Checking to make sure that output is displayed"""
   
     with AssertPrints('2'):
-       ip.run_cell('1+1')
+       ip.run_cell('1+1',store_history=True)
       
     with AssertPrints('2'):
-        ip.run_cell('1+1 # comment with a semicolon;')
+        ip.run_cell('1+1 # comment with a semicolon;',store_history=True)
       
 def test_output_quiet():
     """Checking to make sure that output is quiet"""
   
     with AssertNotPrints('2'):
-        ip.run_cell('1+1;')
+        ip.run_cell('1+1;',store_history=True)
       
     with AssertNotPrints('2'):
-        ip.run_cell('1+1; # comment with a semicolon')
+        ip.run_cell('1+1; # comment with a semicolon',store_history=True)