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from __future__ import absolute_import import unittest import simplejson as json from simplejson.compat import StringIO try: from unittest import mock except ImportError: mock = None try: from collections import namedtuple except ImportError: class Value(tuple): def __new__(cls, *args): return tuple.__new__(cls, args) def _asdict(self): return {'value': self[0]} class Point(tuple): def __new__(cls, *args): return tuple.__new__(cls, args) def _asdict(self): return {'x': self[0], 'y': self[1]} else: Value = namedtuple('Value', ['value']) Point = namedtuple('Point', ['x', 'y']) class DuckValue(object): def __init__(self, *args): self.value = Value(*args) def _asdict(self): return self.value._asdict() class DuckPoint(object): def __init__(self, *args): self.point = Point(*args) def _asdict(self): return self.point._asdict() class DeadDuck(object): _asdict = None class DeadDict(dict): _asdict = None CONSTRUCTORS = [ lambda v: v, lambda v: [v], lambda v: [{'key': v}], ] class TestNamedTuple(unittest.TestCase): def test_namedtuple_dumps(self): for v in [Value(1), Point(1, 2), DuckValue(1), DuckPoint(1, 2)]: d = v._asdict() self.assertEqual(d, json.loads(json.dumps(v))) self.assertEqual( d, json.loads(json.dumps(v, namedtuple_as_object=True))) self.assertEqual(d, json.loads(json.dumps(v, tuple_as_array=False))) self.assertEqual( d, json.loads(json.dumps(v, namedtuple_as_object=True, tuple_as_array=False))) def test_namedtuple_dumps_false(self): for v in [Value(1), Point(1, 2)]: l = list(v) self.assertEqual( l, json.loads(json.dumps(v, namedtuple_as_object=False))) self.assertRaises(TypeError, json.dumps, v, tuple_as_array=False, namedtuple_as_object=False) def test_namedtuple_dump(self): for v in [Value(1), Point(1, 2), DuckValue(1), DuckPoint(1, 2)]: d = v._asdict() sio = StringIO() json.dump(v, sio) self.assertEqual(d, json.loads(sio.getvalue())) sio = StringIO() json.dump(v, sio, namedtuple_as_object=True) self.assertEqual( d, json.loads(sio.getvalue())) sio = StringIO() json.dump(v, sio, tuple_as_array=False) self.assertEqual(d, json.loads(sio.getvalue())) sio = StringIO() json.dump(v, sio, namedtuple_as_object=True, tuple_as_array=False) self.assertEqual( d, json.loads(sio.getvalue())) def test_namedtuple_dump_false(self): for v in [Value(1), Point(1, 2)]: l = list(v) sio = StringIO() json.dump(v, sio, namedtuple_as_object=False) self.assertEqual( l, json.loads(sio.getvalue())) self.assertRaises(TypeError, json.dump, v, StringIO(), tuple_as_array=False, namedtuple_as_object=False) def test_asdict_not_callable_dump(self): for f in CONSTRUCTORS: self.assertRaises( TypeError, json.dump, f(DeadDuck()), StringIO(), namedtuple_as_object=True ) sio = StringIO() json.dump(f(DeadDict()), sio, namedtuple_as_object=True) self.assertEqual( json.dumps(f({})), sio.getvalue()) self.assertRaises( TypeError, json.dump, f(Value), StringIO(), namedtuple_as_object=True ) def test_asdict_not_callable_dumps(self): for f in CONSTRUCTORS: self.assertRaises(TypeError, json.dumps, f(DeadDuck()), namedtuple_as_object=True) self.assertRaises( TypeError, json.dumps, f(Value), namedtuple_as_object=True ) self.assertEqual( json.dumps(f({})), json.dumps(f(DeadDict()), namedtuple_as_object=True)) def test_asdict_unbound_method_dumps(self): for f in CONSTRUCTORS: self.assertEqual( json.dumps(f(Value), default=lambda v: v.__name__), json.dumps(f(Value.__name__)) ) def test_asdict_does_not_return_dict(self): if not mock: if hasattr(unittest, "SkipTest"): raise unittest.SkipTest("unittest.mock required") else: print("unittest.mock not available") return fake = mock.Mock() self.assertTrue(hasattr(fake, '_asdict')) self.assertTrue(callable(fake._asdict)) self.assertFalse(isinstance(fake._asdict(), dict)) # https://github.com/simplejson/simplejson/pull/284 # when running under a debug build of CPython (COPTS=-UNDEBUG) # a C assertion could fire due to an unchecked error of an PyDict # API call on a non-dict internally in _speedups.c. Without a debug # build of CPython this test likely passes either way despite the # potential for internal data corruption. Getting it to crash in # a debug build is not always easy either as it requires an # assert(!PyErr_Occurred()) that could fire later on. with self.assertRaises(TypeError): json.dumps({23: fake}, namedtuple_as_object=True, for_json=False)