more looking for the source of the windows issues

abadger · abadger · commit 1500bc77d842 · 2025-07-20T07:30:31.000-07:00
diff --git a/Lib/shutil.py b/Lib/shutil.py
@@ -444,7 +444,11 @@ def _dst_opener(path, flags):
                 elif _WINDOWS and file_size > 0:
                     _copyfileobj_readinto(fsrc, fdst, min(file_size, COPY_BUFSIZE))
                     return dst
-                copyfileobj(fsrc, fdst)
+                from unittest import mock
+                if isinstance(copyfileobj, mock.Mock):
+                    copyfileobj(fsrc, f"_WINDOWS: {_WINDOWS}\nfile_size: {file_size}")
+                else:
+                    copyfileobj(fsrc, fdst)
 
         # Issue 43219, raise a less confusing exception
         except IsADirectoryError as e:
diff --git a/Lib/test/test_shutil.py b/Lib/test/test_shutil.py
@@ -3133,7 +3133,7 @@ def test_win_impl(self):
                         with unittest.mock.patch("shutil.copyfileobj") as m4:
                             shutil.copyfile(TESTFN, TESTFN2)
 
-        assert m.called, f"_copyfileobj_readinto: {m.called}\n_fastcopy_fcopyfile: {m1.called}\n_fastcopy_copy_file_range: {m2.called}\n_fastcopy_sendfile: {m3.called}\ncopyfileobj: {m4.called}"
+        assert m.called, f"_copyfileobj_readinto: {m.called}\n_fastcopy_fcopyfile: {m1.called}\n_fastcopy_copy_file_range: {m2.called}\n_fastcopy_sendfile: {m3.called}\ncopyfileobj: {m4.called}\ncalled_with: {m4.called_with}"
 
         # File size is 2 MiB but max buf size should be 1 MiB.
         self.assertEqual(m.call_args[0][2], 1 * 1024 * 1024)
