cpython/Lib/test/json_tests/test_decode.py

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import decimal
from io import StringIO
from collections import OrderedDict
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from test.json_tests import PyTest, CTest
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class TestDecode:
def test_decimal(self):
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rval = self.loads('1.1', parse_float=decimal.Decimal)
self.assertTrue(isinstance(rval, decimal.Decimal))
self.assertEqual(rval, decimal.Decimal('1.1'))
def test_float(self):
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rval = self.loads('1', parse_int=float)
self.assertTrue(isinstance(rval, float))
self.assertEqual(rval, 1.0)
def test_empty_objects(self):
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self.assertEqual(self.loads('{}'), {})
self.assertEqual(self.loads('[]'), [])
self.assertEqual(self.loads('""'), "")
def test_object_pairs_hook(self):
s = '{"xkd":1, "kcw":2, "art":3, "hxm":4, "qrt":5, "pad":6, "hoy":7}'
p = [("xkd", 1), ("kcw", 2), ("art", 3), ("hxm", 4),
("qrt", 5), ("pad", 6), ("hoy", 7)]
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self.assertEqual(self.loads(s), eval(s))
self.assertEqual(self.loads(s, object_pairs_hook=lambda x: x), p)
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self.assertEqual(self.json.load(StringIO(s),
object_pairs_hook=lambda x: x), p)
od = self.loads(s, object_pairs_hook=OrderedDict)
self.assertEqual(od, OrderedDict(p))
self.assertEqual(type(od), OrderedDict)
# the object_pairs_hook takes priority over the object_hook
self.assertEqual(self.loads(s, object_pairs_hook=OrderedDict,
object_hook=lambda x: None),
OrderedDict(p))
# check that empty objects literals work (see #17368)
self.assertEqual(self.loads('{}', object_pairs_hook=OrderedDict),
OrderedDict())
self.assertEqual(self.loads('{"empty": {}}',
object_pairs_hook=OrderedDict),
OrderedDict([('empty', OrderedDict())]))
def test_decoder_optimizations(self):
# Several optimizations were made that skip over calls to
# the whitespace regex, so this test is designed to try and
# exercise the uncommon cases. The array cases are already covered.
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rval = self.loads('{ "key" : "value" , "k":"v" }')
self.assertEqual(rval, {"key":"value", "k":"v"})
def check_keys_reuse(self, source, loads):
rval = loads(source)
(a, b), (c, d) = sorted(rval[0]), sorted(rval[1])
self.assertIs(a, c)
self.assertIs(b, d)
def test_keys_reuse(self):
s = '[{"a_key": 1, "b_\xe9": 2}, {"a_key": 3, "b_\xe9": 4}]'
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self.check_keys_reuse(s, self.loads)
self.check_keys_reuse(s, self.json.decoder.JSONDecoder().decode)
def test_extra_data(self):
s = '[1, 2, 3]5'
msg = 'Extra data'
self.assertRaisesRegex(ValueError, msg, self.loads, s)
def test_invalid_escape(self):
s = '["abc\\y"]'
msg = 'escape'
self.assertRaisesRegex(ValueError, msg, self.loads, s)
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class TestPyDecode(TestDecode, PyTest): pass
class TestCDecode(TestDecode, CTest): pass