fix/various fixes

api/tests/test_chapter_markdown_compose.py

@@ -0,0 +1,58 @@
+import unittest
+
+from app.features.memoir.chapter_markdown_compose import (
+    compose_ordered_stories_to_markdown,
+    materialize_chapter_markdown_from_loaded_chapter,
+)
+
+
+class ChapterMarkdownComposeTest(unittest.TestCase):
+    def test_orders_and_separates_with_headings(self):
+        md = compose_ordered_stories_to_markdown(
+            [("第一章", "正文A"), ("第二章", "正文B")]
+        )
+        self.assertIn("## 第一章", md)
+        self.assertIn("正文A", md)
+        self.assertIn("## 第二章", md)
+        self.assertIn("正文B", md)
+        self.assertIn("\n\n---\n\n", md)
+        self.assertTrue(md.index("正文A") < md.index("---"))
+        self.assertTrue(md.index("---") < md.index("第二章"))
+        self.assertTrue(md.index("第一章") < md.index("第二章"))
+
+    def test_preserves_asset_refs(self):
+        body = "![x](asset://abc-123)"
+        md = compose_ordered_stories_to_markdown([("S", body)])
+        self.assertIn("asset://abc-123", md)
+
+    def test_empty_title_uses_fallback(self):
+        md = compose_ordered_stories_to_markdown([("", "仅正文")])
+        self.assertIn("## 故事", md)
+
+    def test_empty_body_keeps_heading_only(self):
+        md = compose_ordered_stories_to_markdown([("仅标题", "")])
+        self.assertEqual(md, "## 仅标题")
+
+    def test_materialize_respects_order_index(self):
+        class _S:
+            def __init__(self, title: str, body: str):
+                self.title = title
+                self.canonical_markdown = body
+
+        class _L:
+            def __init__(self, o: int, story: _S):
+                self.order_index = o
+                self.story = story
+
+        ch = type(
+            "Ch",
+            (),
+            {
+                "story_links": [
+                    _L(1, _S("B", "后")),
+                    _L(0, _S("A", "先")),
+                ]
+            },
+        )()
+        md = materialize_chapter_markdown_from_loaded_chapter(ch)
+        self.assertLess(md.index("先"), md.index("后"))