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Code Issues Projects Releases Packages Wiki Activity Actions 18

bpo-29649: Improve struct.pack_into() boundary error messages (#424)

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This commit is contained in:
Andrew Nester 2017-04-04 13:46:25 +03:00 • committed by Serhiy Storchaka
parent 5de85a1702
commit f78b119364
3 changed files with 53 additions and 4 deletions
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20
Lib/test/test_struct.py
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@ -578,6 +578,26 @@ class StructTest(unittest.TestCase):
self.check_sizeof('0s', 1)
self.check_sizeof('0c', 0)
def test_boundary_error_message(self):
regex = (
r'pack_into requires a buffer of at least 6 '
r'bytes for packing 1 bytes at offset 5 '
r'\(actual buffer size is 1\)'
)
with self.assertRaisesRegex(struct.error, regex):
struct.pack_into('b', bytearray(1), 5, 1)
def test_boundary_error_message_with_negative_offset(self):
byte_list = bytearray(10)
with self.assertRaisesRegex(
struct.error,
r'no space to pack 4 bytes at offset -2'):
struct.pack_into('<I', byte_list, -2, 123)
with self.assertRaisesRegex(
struct.error,
'offset -11 out of range for 10-byte buffer'):
struct.pack_into('<B', byte_list, -11, 123)
class UnpackIteratorTest(unittest.TestCase):
"""