Added tests for displayhook

Work in progress. Tests will fail but we will fix them.

IPython/core/tests/test_displayhook.py

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