From 4a5eb884a9a084e61287e3ab9b03b314b712173d Mon Sep 17 00:00:00 2001
From: msfur <shan.fur@gmx.de>
Date: Mon, 13 Jan 2025 11:53:58 +0100
Subject: [PATCH] Add a new test based on issue #440

---
 tests/test_ads.py | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/tests/test_ads.py b/tests/test_ads.py
index 068db61d..ec2cd1c1 100644
--- a/tests/test_ads.py
+++ b/tests/test_ads.py
@@ -847,6 +847,23 @@ def test_bytes_from_dict(self) -> None:
         # fmt: on
         self.assertEqual(bytes_list, pyads.bytes_from_dict(values, structure_def))
 
+        # test single nested structure (issue #440)
+        structure_def = (
+            ('iVar9', pyads.PLCTYPE_USINT, 1),
+            ('structVar', substructure_def, 1),
+        )
+        values = OrderedDict(
+            [
+                ("iVar9", 29),
+                ("structVar", subvalues)
+            ]
+        )
+        # fmt: off
+        bytes_list = [29] + subbytes_list
+    
+        # fmt: on
+        self.assertEqual(bytes_list, pyads.bytes_from_dict(values, structure_def))
+
     def test_dict_slice_generator(self):
         """test _dict_slice_generator function."""
         test_dict = {