Hmm, didn't define keys.

src/utils.py

@@ -601,8 +601,13 @@ class InsensitivePreservingDict(UserDict.DictMixin, object):
         del self.data[self.key(k)]
 
     def iteritems(self):
-        for t in self.data.itervalues():
-            yield t
+        return self.data.itervalues()
+
+    def keys(self):
+        L = []
+        for (k, _) in self.iteritems():
+            L.append(k)
+        return L
     
     def __reduce__(self):
         return (self.__class__, (dict(self.data.values()),))

test/test_ircutils.py

@@ -212,6 +212,10 @@ class IrcDictTestCase(unittest.TestCase):
         self.assertEqual(d['jemfinch[]'], 'bar')
         self.assertEqual(d['JEMFINCH[]'], 'bar')
 
+    def testKeys(self):
+        d = ircutils.IrcDict()
+        self.assertEqual(d.keys(), [])
+
     def testSetdefault(self):
         d = ircutils.IrcDict()
         d.setdefault('#FOO', []).append(1)

test/test_utils.py

@@ -349,6 +349,7 @@ class UtilsTest(unittest.TestCase):
         ipd = utils.InsensitivePreservingDict
         d = ipd(dict(Foo=10))
         self.failUnless(d['foo'] == 10)
+        self.assertEqual(d.keys(), ['Foo'])
 
 
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