Lists differ: [[(1,[40 chars][]))], [(1, ([1, 1, 1], [])), (2, ([1], [])), [81 chars]]))]] != [[(1,[40 chars][]))]] First list contains 2 additional elements. First extra element 1: [(1, ([1, 1, 1], [])), (2, ([1], [])), (4, ([], [1]))] - [[(1, ([1], [2])), (2, ([1], [])), (3, ([1], []))], ? ^ + [[(1, ([1], [2])), (2, ([1], [])), (3, ([1], []))]] ? ^ - [(1, ([1, 1, 1], [])), (2, ([1], [])), (4, ([], [1]))], - [('', ([1, 1], [1, 2])), ('a', ([1, 1], [1, 1])), ('b', ([1], [1]))]]

Traceback (most recent call last):
  File "/home/jenkins/workspace/spark-master-test-sbt-hadoop-2.6/python/pyspark/streaming/tests.py", line 349, in test_cogroup
    self._test_func(input, func, expected, sort=True, input2=input2)
  File "/home/jenkins/workspace/spark-master-test-sbt-hadoop-2.6/python/pyspark/streaming/tests.py", line 160, in _test_func
    self.assertEqual(expected, result)
AssertionError: Lists differ: [[(1,[40 chars][]))], [(1, ([1, 1, 1], [])), (2, ([1], [])), [81 chars]]))]] != [[(1,[40 chars][]))]]

First list contains 2 additional elements.
First extra element 1:
[(1, ([1, 1, 1], [])), (2, ([1], [])), (4, ([], [1]))]

- [[(1, ([1], [2])), (2, ([1], [])), (3, ([1], []))],
?                                                   ^

+ [[(1, ([1], [2])), (2, ([1], [])), (3, ([1], []))]]
?                                                   ^

-  [(1, ([1, 1, 1], [])), (2, ([1], [])), (4, ([], [1]))],
-  [('', ([1, 1], [1, 2])), ('a', ([1, 1], [1, 1])), ('b', ([1], [1]))]]

Stdout:
('timeout after', 10)