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Diffstat (limited to 'Lib/test/test_builtin.py')
| -rw-r--r-- | Lib/test/test_builtin.py | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/Lib/test/test_builtin.py b/Lib/test/test_builtin.py index 2b0c017..92e44d5 100644 --- a/Lib/test/test_builtin.py +++ b/Lib/test/test_builtin.py @@ -408,6 +408,29 @@ class BuiltinTest(unittest.TestCase): unicode("345") ) + def test_filter_subclasses(self): + # test, that filter() never returns tuple, str or unicode subclasses + funcs = (None, lambda x: True) + class tuple2(tuple): + pass + class str2(str): + pass + inputs = { + tuple2: [(), (1,2,3)], + str2: ["", "123"] + } + if have_unicode: + class unicode2(unicode): + pass + inputs[unicode2] = [unicode(), unicode("123")] + + for func in funcs: + for (cls, inps) in inputs.iteritems(): + for inp in inps: + out = filter(func, cls(inp)) + self.assertEqual(inp, out) + self.assert_(not isinstance(out, cls)) + def test_float(self): self.assertEqual(float(3.14), 3.14) self.assertEqual(float(314), 314.0) |