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merged 2 commits into from
Nov 29, 2022
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gh-99593: Add tests for Unicode C API (part 1) #99651

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gh-99593: Add tests for Unicode C API (part 1)
serhiy-storchaka Aug 13, 2018
545400a
Address review comments.
serhiy-storchaka Nov 27, 2022
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Address review comments.
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@serhiy-storchaka
serhiy-storchaka committed Nov 27, 2022
commit 545400a95a6314192f4f8b9487c2c699d0f18db7
24 changes: 16 additions & 8 deletions Lib/test/test_capi/test_unicode.py
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,10 @@

NULL = None

class Str(str):
pass


class CAPITest(unittest.TestCase):

@support.cpython_only
Expand All @@ -22,6 +26,11 @@ def test_fromobject(self):
for s in ['abc', '\xa1\xa2', '\u4f60\u597d', 'a\U0001f600',
'a\ud800b\udfffc', '\ud834\udd1e']:
self.assertEqual(fromobject(s), s)
o = Str(s)
s2 = fromobject(o)
self.assertEqual(s2, s)
self.assertIs(type(s2), str)
self.assertIsNot(s2, s)

self.assertRaises(TypeError, fromobject, b'abc')
self.assertRaises(TypeError, fromobject, [])
Expand Down Expand Up @@ -438,7 +447,7 @@ def test_split(self):
self.assertRaises(ValueError, split, 'a|b|c|d', '')
self.assertRaises(TypeError, split, 'a|b|c|d', ord('|'))
self.assertRaises(TypeError, split, [], '|')
# split(NULL, '|')
# CRASHES split(NULL, '|')

@support.cpython_only
@unittest.skipIf(_testcapi is None, 'need _testcapi module')
Expand All @@ -462,7 +471,7 @@ def test_rsplit(self):
self.assertRaises(ValueError, rsplit, 'a|b|c|d', '')
self.assertRaises(TypeError, rsplit, 'a|b|c|d', ord('|'))
self.assertRaises(TypeError, rsplit, [], '|')
# rsplit(NULL, '|')
# CRASHES rsplit(NULL, '|')

@support.cpython_only
@unittest.skipIf(_testcapi is None, 'need _testcapi module')
Expand Down Expand Up @@ -530,6 +539,7 @@ def test_translate(self):

self.assertEqual(translate('abcd', {ord('a'): 'A', ord('b'): ord('B'), ord('c'): '<>'}), 'AB<>d')
self.assertEqual(translate('абвг', {ord('а'): 'А', ord('б'): ord('Б'), ord('в'): '<>'}), 'АБ<>г')
self.assertEqual(translate('abc', {}), 'abc')
self.assertEqual(translate('abc', []), 'abc')
self.assertRaises(UnicodeTranslateError, translate, 'abc', {ord('b'): None})
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I don't understand. None is supposed to delete the "b" character: https://docs.python.org/dev/library/stdtypes.html#text-sequence-type-str

The mapping table must map Unicode ordinal integers to Unicode ordinal integers or None (causing deletion of the character).

Is the doc wrong?

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The doc is wrong.

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Ah. The surprising part is that str.translate() treats None as "delete:

>>> "abc".translate(str.maketrans({'b': None}))
'ac'

Well, it would be nice to update the doc (maybe in a separated PR).

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Because str.translate calls PyUnicode_Translate() with the error handler "ignore".

self.assertRaises(UnicodeTranslateError, translate, 'abc', {ord('b'): None}, 'strict')
Expand All @@ -543,6 +553,7 @@ def test_translate(self):
self.assertRaises(TypeError, translate, 'abc', {ord('a'): b'A'})
self.assertRaises(TypeError, translate, 'abc', 123)
self.assertRaises(TypeError, translate, 'abc', NULL)
self.assertRaises(LookupError, translate, 'abc', {ord('b'): None}, 'foo')
# CRASHES translate(NULL, [])

@support.cpython_only
Expand All @@ -551,6 +562,7 @@ def test_join(self):
"""Test PyUnicode_Join()"""
from _testcapi import unicode_join as join
self.assertEqual(join('|', ['a', 'b', 'c']), 'a|b|c')
self.assertEqual(join('|', ['a', '', 'c']), 'a||c')
self.assertEqual(join('', ['a', 'b', 'c']), 'abc')
self.assertEqual(join(NULL, ['a', 'b', 'c']), 'a b c')
self.assertEqual(join('|', ['а', 'б', 'в']), 'а|б|в')
Expand Down Expand Up @@ -596,11 +608,6 @@ def test_tailmatch(self):
"""Test PyUnicode_Tailmatch()"""
from _testcapi import unicode_tailmatch as tailmatch

#for str in "\xa1", "\u8000\u8080", "\ud800\udc02", "\U0001f100\U0001f1f1":
#for i, ch in enumerate(str):
#self.assertEqual(tailmatch(str, ch, 0, len(str), 1), i)
#self.assertEqual(tailmatch(str, ch, 0, len(str), -1), i)

str = 'ababahalamaha'
self.assertEqual(tailmatch(str, 'aba', 0, len(str), -1), 1)
self.assertEqual(tailmatch(str, 'aha', 0, len(str), 1), 1)
Expand Down Expand Up @@ -790,7 +797,7 @@ def test_richcompare(self):
@support.cpython_only
@unittest.skipIf(_testcapi is None, 'need _testcapi module')
def test_format(self):
"""Test PyUnicode_Contains()"""
"""Test PyUnicode_Format()"""
from _testcapi import unicode_format as format

self.assertEqual(format('x=%d!', 42), 'x=42!')
Expand Down Expand Up @@ -838,6 +845,7 @@ def test_isidentifier(self):
self.assertEqual(isidentifier("["), 0)
self.assertEqual(isidentifier("©"), 0)
self.assertEqual(isidentifier("0"), 0)
self.assertEqual(isidentifier("32M"), 0)

# CRASHES isidentifier(b"a")
# CRASHES isidentifier([])
Expand Down
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