Update test/test_buffer from CPython 3.11.2

Lib/test/test_buffer.py

@@ -46,6 +46,11 @@ try:
 except ImportError:
     numpy_array = None
 
+try:
+    import _testcapi
+except ImportError:
+    _testcapi = None
+
 
 SHORT_TEST = True
 
@@ -967,8 +972,6 @@ class TestBufferProtocol(unittest.TestCase):
             m.tobytes()  # Releasing mm didn't release m
 
     def verify_getbuf(self, orig_ex, ex, req, sliced=False):
-        def simple_fmt(ex):
-            return ex.format == '' or ex.format == 'B'
         def match(req, flag):
             return ((req&flag) == flag)
 
@@ -2526,7 +2529,7 @@ class TestBufferProtocol(unittest.TestCase):
         values = [INT(9), IDX(9),
                   2.2+3j, Decimal("-21.1"), 12.2, Fraction(5, 2),
                   [1,2,3], {4,5,6}, {7:8}, (), (9,),
-                  True, False, None, NotImplemented,
+                  True, False, None, Ellipsis,
                   b'a', b'abc', bytearray(b'a'), bytearray(b'abc'),
                   'a', 'abc', r'a', r'abc',
                   f, lambda x: x]
@@ -4419,6 +4422,13 @@ class TestBufferProtocol(unittest.TestCase):
         x = ndarray([1,2,3], shape=[3], flags=ND_GETBUF_FAIL)
         self.assertRaises(BufferError, memoryview, x)
 
+    @support.cpython_only
+    def test_pybuffer_size_from_format(self):
+        # basic tests
+        for format in ('', 'ii', '3s'):
+            self.assertEqual(_testcapi.PyBuffer_SizeFromFormat(format),
+                             struct.calcsize(format))
+
 
 if __name__ == "__main__":
     unittest.main()