1 files changed, 22 insertions, 0 deletions
diff --git a/Lib/test/test_uu.py b/Lib/test/test_uu.py
index cbf6724..25fffbf 100644
--- a/Lib/test/test_uu.py
+++ b/Lib/test/test_uu.py
@@ -93,6 +93,28 @@ class UUTest(unittest.TestCase):
         except uu.Error as e:
             self.assertEqual(str(e), "No valid begin line found in input file")
 
+    def test_garbage_padding(self):
+        # Issue #22406
+        encodedtext = (
+            b"begin 644 file\n"
+            # length 1; bits 001100 111111 111111 111111
+            b"\x21\x2C\x5F\x5F\x5F\n"
+            b"\x20\n"
+            b"end\n"
+        )
+        plaintext = b"\x33"  # 00110011
+
+        with self.subTest("uu.decode()"):
+            inp = io.BytesIO(encodedtext)
+            out = io.BytesIO()
+            uu.decode(inp, out, quiet=True)
+            self.assertEqual(out.getvalue(), plaintext)
+
+        with self.subTest("uu_codec"):
+            import codecs
+            decoded = codecs.decode(encodedtext, "uu_codec")
+            self.assertEqual(decoded, plaintext)
+
 class UUStdIOTest(unittest.TestCase):
 
     def setUp(self):