GH-91153: Add short clarifying comments to test

bast0006 · bast0006 · commit 4b7ec9cb9097 · 2025-06-03T13:56:52.000-07:00
diff --git a/Lib/test/test_bytes.py b/Lib/test/test_bytes.py
@@ -1872,6 +1872,8 @@ def test_repeat_after_setslice(self):
         self.assertEqual(b3, b'xcxcxc')
 
     def test_mutating_index(self):
+        # bytearray slice assignment can call into python code
+        # that reallocates the internal buffer
         # See gh-91153
 
         class Boom:
@@ -1890,10 +1892,10 @@ def __index__(self):
                 self._testlimitedcapi.sequence_setitem(b, 0, Boom())
 
     def test_mutating_index_inbounds(self):
-        # See gh-91153
+        # gh-91153 continued
+        # Ensure buffer is not broken even if length is correct
 
         class MutatesOnIndex:
-
             def __init__(self):
                 self.ba = bytearray(0x180)
 
