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bpo-45280: Add test for empty NamedTuple in test_typing #28559

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Sep 26, 2021
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bpo-45280: Add test for empty NamedTuple in test_typing #28559

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5e3f9bc
bpo-45280: adds test for empty `NamedTuple` in `test_typing`
sobolevn Sep 25, 2021
4f28f82
Update Misc/NEWS.d/next/Tests/2021-09-25-11-05-31.bpo-45280.3MA6lC.rst
sobolevn Sep 25, 2021
3198ec1
Update 2021-09-25-11-05-31.bpo-45280.3MA6lC.rst
sobolevn Sep 25, 2021
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13 changes: 13 additions & 0 deletions Lib/test/test_typing.py
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Original file line number Diff line number Diff line change
Expand Up @@ -4099,6 +4099,19 @@ def test_namedtuple_special_keyword_names(self):
self.assertEqual(a.typename, 'foo')
self.assertEqual(a.fields, [('bar', tuple)])

def test_empty_namedtuple(self):
NT = NamedTuple('NT')

class CNT(NamedTuple):
pass # empty body

for struct in [NT, CNT]:
with self.subTest(struct=struct):
self.assertEqual(struct._fields, ())
self.assertEqual(struct._field_defaults, {})
self.assertEqual(struct.__annotations__, {})
self.assertIsInstance(struct(), struct)

def test_namedtuple_errors(self):
with self.assertRaises(TypeError):
NamedTuple.__new__()
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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Tests/2021-09-25-11-05-31.bpo-45280.3MA6lC.rst
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@@ -0,0 +1 @@
Add a test case for empty :class:`typing.NamedTuple`.