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# mode: run
# cython: language_level=3
import unittest
import sys
cdef class UnSupport: pass
cdef class Unpack:
para_list = []
def __class_getitem__(*args, **kwargs):
Unpack.para_list.extend([args, kwargs])
cdef class Format:
def __class_getitem__(cls, item):
return f'{cls.__name__}[{item.__name__}]'
cdef class ExFormat(Format): pass
cdef class Override:
def __class_getitem__(cls, item):
return 'Should not see this'
cdef class Covered(Override):
def __class_getitem__(cls, item):
return f'{cls.__name__}[{item.__name__}]'
cdef class Decorated:
@classmethod
def __class_getitem__(cls, item):
return f'{cls.__name__}[{item.__name__}]'
cdef class ExDecorated(Decorated): pass
cdef class Invalid1:
def __class_getitem__(cls): pass
cdef class Invalid2:
def __class_getitem__(cls, item1, item2): pass
cdef class Invalid3:
cdef dict __dict__
def __init__(self):
self.__class_getitem__ = lambda cls, items: 'This will not work'
cdef class Invalid4:
__class_getitem__ = "Surprise!"
class TestClassGetitem(unittest.TestCase):
# BEGIN - Additional tests from cython
def test_no_class_getitem(self):
# PyPy<7.3.8 raises AttributeError on __class_getitem__
if hasattr(sys, "pypy_version_info") and sys.pypy_version_info < (7, 3, 8):
err = AttributeError
else:
err = TypeError
with self.assertRaises(err):
UnSupport[int]
# END - Additional tests from cython
def test_class_getitem(self):
Unpack[int, str]
self.assertEqual(Unpack.para_list[0], (Unpack, (int, str)))
self.assertEqual(Unpack.para_list[1], {})
def test_class_getitem_format(self):
self.assertEqual(Format[int], 'Format[int]')
self.assertEqual(Format[Format], 'Format[Format]')
def test_class_getitem_inheritance(self):
self.assertEqual(ExFormat[int], 'ExFormat[int]')
self.assertEqual(ExFormat[ExFormat], 'ExFormat[ExFormat]')
def test_class_getitem_inheritance_2(self):
self.assertEqual(Covered[int], 'Covered[int]')
self.assertEqual(Covered[Covered], 'Covered[Covered]')
def test_class_getitem_classmethod(self):
self.assertEqual(ExDecorated[int], 'ExDecorated[int]')
self.assertEqual(ExDecorated[ExDecorated], 'ExDecorated[ExDecorated]')
def test_class_getitem_errors(self):
with self.assertRaises(TypeError):
Invalid1[int]
with self.assertRaises(TypeError):
Invalid2[int]
def test_class_getitem_errors_2(self):
with self.assertRaises(TypeError):
Format()[int]
with self.assertRaises(TypeError):
Invalid3()[int]
with self.assertRaises(TypeError):
Invalid4[int]
if __name__ == '__main__':
unittest.main()
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