diff --git a/tests/test_wiki_docs.py b/tests/test_wiki_docs.py
index 5fca242..e4685cf 100644
--- a/tests/test_wiki_docs.py
+++ b/tests/test_wiki_docs.py
@@ -6,7 +6,7 @@ import sys
 import tempfile
 import unittest
 from pathlib import Path
-from unittest.mock import patch
+from unittest.mock import Mock, patch
 
 
 ROOT = Path(__file__).resolve().parents[1]
@@ -22,6 +22,7 @@ from wiki_docs import (  # noqa: E402
     load_config,
     parse_mirror,
     render_mirror,
+    sync_all,
     validate_mappings,
 )
 
@@ -99,6 +100,20 @@ class MirrorTests(unittest.TestCase):
         )
         self.assertEqual(dirty_mirror_paths(config), [" M docs/README.md"])
 
+    @patch("wiki_docs.dirty_mirror_paths", return_value=[" M docs/README.md"])
+    def test_sync_stops_before_reading_wiki_when_mirror_is_dirty(self, _dirty) -> None:
+        config = Config(
+            path=Path("wiki-docs.json"),
+            gitea_url="http://gitea.example",
+            owner="o",
+            repository="r",
+            mappings=(Mapping("Home", "docs/README.md"),),
+        )
+        client = Mock()
+        with self.assertRaisesRegex(WikiDocsError, "未提交改动"):
+            sync_all(config, client)
+        client.get_page.assert_not_called()
+
 
 class ArchiveTests(unittest.TestCase):
     def test_safe_title_handles_windows_characters(self) -> None: