bpo-43219: shutil.copyfile, raise a less confusing exception instead of IsADirectoryError (GH-27049)

Fixes the misleading IsADirectoryError to be FileNotFoundError.

1 files changed, 9 insertions, 0 deletions

diff --git a/Lib/test/test_shutil.py b/Lib/test/test_shutil.py
index 493c7e5f9f..e2574253d9 100644
--- a/Lib/test/test_shutil.py
+++ b/Lib/test/test_shutil.py
@@ -1249,6 +1249,15 @@ class TestCopy(BaseTest, unittest.TestCase):
         # Make sure file is not corrupted.
         self.assertEqual(read_file(src_file), 'foo')
 
+    @unittest.skipIf(MACOS or _winapi, 'On MACOS and Windows the errors are not confusing (though different)')
+    def test_copyfile_nonexistent_dir(self):
+        # Issue 43219
+        src_dir = self.mkdtemp()
+        src_file = os.path.join(src_dir, 'foo')
+        dst = os.path.join(src_dir, 'does_not_exist/')
+        write_file(src_file, 'foo')
+        self.assertRaises(FileNotFoundError, shutil.copyfile, src_file, dst)
+
 
 class TestArchives(BaseTest, unittest.TestCase):