diff options
Diffstat (limited to 'Lib/test/test_pprint.py')
| -rw-r--r-- | Lib/test/test_pprint.py | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/Lib/test/test_pprint.py b/Lib/test/test_pprint.py index ad3a193..4e53cd8 100644 --- a/Lib/test/test_pprint.py +++ b/Lib/test/test_pprint.py @@ -3,6 +3,8 @@ import test.support import unittest import test.test_set import random +import collections +import itertools # list, tuple and dict subclasses that do or don't overwrite __repr__ class list2(list): @@ -195,6 +197,20 @@ class QueryTestCase(unittest.TestCase): self.assertEqual(pprint.pformat({"xy\tab\n": (3,), 5: [[]], (): {}}), r"{5: [[]], 'xy\tab\n': (3,), (): {}}") + def test_ordered_dict(self): + words = 'the quick brown fox jumped over a lazy dog'.split() + d = collections.OrderedDict(zip(words, itertools.count())) + self.assertEqual(pprint.pformat(d), +"""\ +{'the': 0, + 'quick': 1, + 'brown': 2, + 'fox': 3, + 'jumped': 4, + 'over': 5, + 'a': 6, + 'lazy': 7, + 'dog': 8}""") def test_subclassing(self): o = {'names with spaces': 'should be presented using repr()', 'others.should.not.be': 'like.this'} @@ -203,7 +219,29 @@ class QueryTestCase(unittest.TestCase): others.should.not.be: like.this}""" self.assertEqual(DottedPrettyPrinter().pformat(o), exp) + @test.support.cpython_only def test_set_reprs(self): + # This test creates a complex arrangement of frozensets and + # compares the pretty-printed repr against a string hard-coded in + # the test. The hard-coded repr depends on the sort order of + # frozensets. + # + # However, as the docs point out: "Since sets only define + # partial ordering (subset relationships), the output of the + # list.sort() method is undefined for lists of sets." + # + # In a nutshell, the test assumes frozenset({0}) will always + # sort before frozenset({1}), but: + # + # >>> frozenset({0}) < frozenset({1}) + # False + # >>> frozenset({1}) < frozenset({0}) + # False + # + # Consequently, this test is fragile and + # implementation-dependent. Small changes to Python's sort + # algorithm cause the test to fail when it should pass. + self.assertEqual(pprint.pformat(set()), 'set()') self.assertEqual(pprint.pformat(set(range(3))), '{0, 1, 2}') self.assertEqual(pprint.pformat(frozenset()), 'frozenset()') |