name : test_separators.py import textwrap from unittest import TestCase import simplejson as json class TestSeparators(TestCase): def test_separators(self): h = [['blorpie'], ['whoops'], [], 'd-shtaeou', 'd-nthiouh', 'i-vhbjkhnth', {'nifty': 87}, {'field': 'yes', 'morefield': False} ] expect = textwrap.dedent("""\ [ [ "blorpie" ] , [ "whoops" ] , [] , "d-shtaeou" , "d-nthiouh" , "i-vhbjkhnth" , { "nifty" : 87 } , { "field" : "yes" , "morefield" : false } ]""") d1 = json.dumps(h) d2 = json.dumps(h, indent=' ', sort_keys=True, separators=(' ,', ' : ')) h1 = json.loads(d1) h2 = json.loads(d2) self.assertEqual(h1, h) self.assertEqual(h2, h) self.assertEqual(d2, expect)