Python 2.6: Add `assert_is_none`, `assert_is_not_none` to `nose.tools`.

IPython/testing/nose_assert_methods.py

@@ -1,17 +1,29
 """Add some assert methods to nose.tools. These were added in Python 2.7/3.1, so
 once we stop testing on Python 2.6, this file can be removed.
 """
 
 import nose.tools as nt
 
 def assert_in(item, collection):
     assert item in collection, '%r not in %r' % (item, collection)
 
 if not hasattr(nt, 'assert_in'):
     nt.assert_in = assert_in
 
 def assert_not_in(item, collection):
     assert item not in collection, '%r in %r' % (item, collection)
 
 if not hasattr(nt, 'assert_not_in'):
     nt.assert_not_in = assert_not_in
+
+def assert_is_none(obj):
+    assert obj is None, '%r is not None' % obj
+
+if not hasattr(nt, 'assert_is_none'):
+    nt.assert_is_none = assert_is_none
+
+def assert_is_not_none(obj):
+    assert obj is not None, '%r is None' % obj
+
+if not hasattr(nt, 'assert_is_not_none'):
+    nt.assert_is_not_none = assert_is_not_none