celery/celery/tests/test_utils.py

import unittest
from celery.utils import chunks


class TestChunks(unittest.TestCase):

    def test_chunks(self):

        # n == 2
        x = chunks(iter([0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]), 2)
        self.assertEquals(list(x),
            [[0, 1], [2, 3], [4, 5], [6, 7], [8, 9], [10]])

        # n == 3
        x = chunks(iter([0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]), 3)
        self.assertEquals(list(x),
            [[0, 1, 2], [3, 4, 5], [6, 7, 8], [9, 10]])

        # n == 2 (exact)
        x = chunks(iter([0, 1, 2, 3, 4, 5, 6, 7, 8, 9]), 2)
        self.assertEquals(list(x),
            [[0, 1], [2, 3], [4, 5], [6, 7], [8, 9]])