Add simple test for modified repr as per review.

IPython/core/tests/test_debugger.py

@@ -0,0 +1,35 b''
+"""Tests for debugging machinery.
+"""
+#-----------------------------------------------------------------------------
+#  Copyright (c) 2012, The IPython Development Team.
+#
+#  Distributed under the terms of the Modified BSD License.
+#
+#  The full license is in the file COPYING.txt, distributed with this software.
+#-----------------------------------------------------------------------------
+
+#-----------------------------------------------------------------------------
+# Imports
+#-----------------------------------------------------------------------------
+
+# third-party
+import nose.tools as nt
+
+# Our own
+from IPython.core import debugger
+
+#-----------------------------------------------------------------------------
+# Tests
+#-----------------------------------------------------------------------------
+
+def test_longer_repr():
+    from repr import repr as trepr
+    
+    a = '1234567890'* 7
+    ar = "'1234567890123456789012345678901234567890123456789012345678901234567890'"
+    a_trunc = "'123456789012...8901234567890'"
+    nt.assert_equals(trepr(a), a_trunc)
+    # The creation of our tracer modifies the repr module's repr function
+    # in-place, since that global is used directly by the stdlib's pdb module.
+    t = debugger.Tracer()
+    nt.assert_equals(trepr(a), ar)