bpo-45280: Add test for empty `NamedTuple` in `test_typing` (GH-28559) (GH-28571)
Co-authored-by: Dong-hee Na <donghee.na92@gmail.com>
(cherry picked from commit f56268a2cd38b3fe2be1e4361d3d8b581e73559b)
Co-authored-by: Nikita Sobolev <mail@sobolevn.me>
diff --git a/Lib/test/test_typing.py b/Lib/test/test_typing.py
index 4f250f2..762c0cc 100644
--- a/Lib/test/test_typing.py
+++ b/Lib/test/test_typing.py
@@ -4081,6 +4081,19 @@ 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__()
diff --git a/Misc/NEWS.d/next/Tests/2021-09-25-11-05-31.bpo-45280.3MA6lC.rst b/Misc/NEWS.d/next/Tests/2021-09-25-11-05-31.bpo-45280.3MA6lC.rst
new file mode 100644
index 0000000..71691f5
--- /dev/null
+++ b/Misc/NEWS.d/next/Tests/2021-09-25-11-05-31.bpo-45280.3MA6lC.rst
@@ -0,0 +1 @@
+Add a test case for empty :class:`typing.NamedTuple`.