added test for GH-307

IPython/core/tests/test_interactiveshell.py

@@ -1,64 +1,76 b''
 """Tests for the key interactiveshell module.
 
 Historically the main classes in interactiveshell have been under-tested.  This
 module should grow as many single-method tests as possible to trap many of the
 recurring bugs we seem to encounter with high-level interaction.
 
 Authors
 -------
 * Fernando Perez
 """
 #-----------------------------------------------------------------------------
 #  Copyright (C) 2011  The IPython Development Team
 #
 #  Distributed under the terms of the BSD License.  The full license is in
 #  the file COPYING, distributed as part of this software.
 #-----------------------------------------------------------------------------
 
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
 # stdlib
 import unittest
 
 #-----------------------------------------------------------------------------
 # Tests
 #-----------------------------------------------------------------------------
 
 class InteractiveShellTestCase(unittest.TestCase):
     def test_naked_string_cells(self):
         """Test that cells with only naked strings are fully executed"""
         ip = get_ipython()
         # First, single-line inputs
         ip.run_cell('"a"\n')
         self.assertEquals(ip.user_ns['_'], 'a')
         # And also multi-line cells
         ip.run_cell('"""a\nb"""\n')
         self.assertEquals(ip.user_ns['_'], 'a\nb')
 
     def test_run_empty_cell(self):
         """Just make sure we don't get a horrible error with a blank
         cell of input. Yes, I did overlook that."""
         ip = get_ipython()
         ip.run_cell('')
 
     def test_run_cell_multiline(self):
         """Multi-block, multi-line cells must execute correctly.
         """
         ip = get_ipython()
         src = '\n'.join(["x=1",
                          "y=2",
                          "if 1:",
                          "    x += 1",
                          "    y += 1",])
         ip.run_cell(src)
         self.assertEquals(ip.user_ns['x'], 2)
         self.assertEquals(ip.user_ns['y'], 3)
 
     def test_multiline_string_cells(self):
-        """Code sprinkled with multiline strings should execute (GH-306)"""
+        "Code sprinkled with multiline strings should execute (GH-306)"
         ip = get_ipython()
         ip.run_cell('tmp=0')
         self.assertEquals(ip.user_ns['tmp'], 0)
         ip.run_cell('tmp=1;"""a\nb"""\n')
         self.assertEquals(ip.user_ns['tmp'], 1)
+
+    def test_dont_cache_with_semicolon(self):
+        "Ending a line with semicolon should not cache the returned object (GH-307)"
+        ip = get_ipython()
+        oldlen = len(ip.user_ns['Out'])
+        a = ip.run_cell('1;')
+        newlen = len(ip.user_ns['Out'])
+        self.assertEquals(oldlen, newlen)
+        #also test the default caching behavior
+        a = ip.run_cell('1')
+        newlen = len(ip.user_ns['Out'])
+        self.assertEquals(oldlen+1, newlen)