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Merged
youknowone merged 1 commit into from
Apr 15, 2026
+63 −2
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Update test_struct.py from 3.14.4 #7614

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65 changes: 63 additions & 2 deletions Lib/test/test_struct.py
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Original file line number Diff line number Diff line change
Expand Up @@ -398,6 +398,21 @@ def test_705836(self):
big = (1 << 25) - 1
big = math.ldexp(big, 127 - 24)
self.assertRaises(OverflowError, struct.pack, ">f", big)
self.assertRaises(OverflowError, struct.pack, "<f", big)
# same for native format, see gh-145633
self.assertRaises(OverflowError, struct.pack, "f", big)

# And for half-floats
big = (1 << 11) - 1
big = math.ldexp(big, 15 - 10)
packed = struct.pack(">e", big)
unpacked = struct.unpack(">e", packed)[0]
self.assertEqual(big, unpacked)
big = (1 << 12) - 1
big = math.ldexp(big, 15 - 11)
self.assertRaises(OverflowError, struct.pack, ">e", big)
self.assertRaises(OverflowError, struct.pack, "<e", big)
self.assertRaises(OverflowError, struct.pack, "e", big)

def test_1530559(self):
for code, byteorder in iter_integer_formats():
Expand Down Expand Up @@ -555,6 +570,15 @@ def test_count_overflow(self):
hugecount2 = '{}b{}H'.format(sys.maxsize//2, sys.maxsize//2)
self.assertRaises(struct.error, struct.calcsize, hugecount2)

hugecount3 = '{}i{}q'.format(sys.maxsize // 4, sys.maxsize // 8)
self.assertRaises(struct.error, struct.calcsize, hugecount3)

hugecount4 = '{}?s'.format(sys.maxsize)
self.assertRaises(struct.error, struct.calcsize, hugecount4)

hugecount5 = '{}?p'.format(sys.maxsize)
self.assertRaises(struct.error, struct.calcsize, hugecount5)

def test_trailing_counter(self):
store = array.array('b', b' '*100)

Expand All @@ -580,12 +604,29 @@ def test_trailing_counter(self):
'spam and eggs')
self.assertRaises(struct.error, struct.unpack_from, '14s42', store, 0)

@unittest.expectedFailure # TODO: RUSTPYTHON; AssertionError: '>h' != '>hh'
def test_Struct_reinitialization(self):
# Issue 9422: there was a memory leak when reinitializing a
# Struct instance. This test can be used to detect the leak
# when running with regrtest -L.
s = struct.Struct('i')
s.__init__('ii')
s = struct.Struct('>h')
s.__init__('>hh')
self.assertEqual(s.format, '>hh')
packed = b'\x00\x01\x00\x02'
self.assertEqual(s.pack(1, 2), packed)
self.assertEqual(s.unpack(packed), (1, 2))

with self.assertRaises(UnicodeEncodeError):
s.__init__('\udc00')
self.assertEqual(s.format, '>hh')
self.assertEqual(s.pack(1, 2), packed)
self.assertEqual(s.unpack(packed), (1, 2))

with self.assertRaises(struct.error):
s.__init__('$')
self.assertEqual(s.format, '>hh')
self.assertEqual(s.pack(1, 2), packed)
self.assertEqual(s.unpack(packed), (1, 2))

def check_sizeof(self, format_str, number_of_codes):
# The size of 'PyStructObject'
Expand Down Expand Up @@ -840,8 +881,28 @@ def test_operations_on_half_initialized_Struct(self):
self.assertRaises(RuntimeError, S.unpack, spam)
self.assertRaises(RuntimeError, S.unpack_from, spam)
self.assertRaises(RuntimeError, getattr, S, 'format')
self.assertRaises(RuntimeError, S.__sizeof__)
self.assertRaises(RuntimeError, repr, S)
self.assertEqual(S.size, -1)

def test_float_round_trip(self):
for format in (
"f", "<f", ">f",
"d", "<d", ">d",
"e", "<e", ">e",
):
with self.subTest(format=format):
f = struct.unpack(format, struct.pack(format, 1.5))[0]
self.assertEqual(f, 1.5)
f = struct.unpack(format, struct.pack(format, NAN))[0]
self.assertTrue(math.isnan(f), f)
f = struct.unpack(format, struct.pack(format, INF))[0]
self.assertTrue(math.isinf(f), f)
self.assertEqual(math.copysign(1.0, f), 1.0)
f = struct.unpack(format, struct.pack(format, -INF))[0]
self.assertTrue(math.isinf(f), f)
self.assertEqual(math.copysign(1.0, f), -1.0)


class UnpackIteratorTest(unittest.TestCase):
"""
Expand Down
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