pymongo Cursor and Limit Indexing Issue

gistfile1.py

import pymongo
import unittest


class TestIndexFailure(unittest.TestCase):
    def setUp(self):
        self.coll = pymongo.Connection()['test']['test']
        self.coll.drop()
        self.coll.save({"key":"Value1"})
        self.coll.save({"key":"Value2"})
        self.idval = self.coll.find_one({"key":"Value1"})["_id"]

    def tearDown(self):
        self.coll.drop()
        del self.coll

    def testQueryFind(self):
        q = self.coll.find(spec={"key":"Value1"})
        self.assertEqual("Value1", q[0]['key'])
        self.assertRaises(IndexError, lambda: q[1])

    def testQueryIdFieldFind(self):
        """A cursor based on an _id query will return the matched document whatever the index."""
        q = self.coll.find(spec={"_id":self.idval})
        self.assertEqual("Value1", q[0]['key'])
        self.assertRaises(IndexError, lambda: q[1])

    def testQueryLimitFind(self):
        """A cursor with a limit will continue to return values for indexes after the limit."""
        q = self.coll.find(limit=1)
        self.assertRegexpMatches(q[0]['key'], r'^Value\d')
        self.assertRaises(IndexError, lambda: q[1])