add summary

tests/test_app.py

@@ -178,6 +178,53 @@ def test_boxes_overview_renders_cleanly_when_note_is_empty(client, db_session):
     assert "状态：" not in response.text
 
 
+def test_boxes_overview_summary_shows_expected_counts_and_averages(client, db_session):
+    first_box = Box(name="卧室箱")
+    second_box = Box(name="书房箱")
+    regular_item = Item(name="书", box=first_box, is_container=False)
+    container_item = Item(name="配件袋", box=first_box, is_container=True)
+    second_container_item = Item(name="文件袋", box=second_box, is_container=True)
+    db_session.add_all(
+        [
+            first_box,
+            second_box,
+            regular_item,
+            container_item,
+            second_container_item,
+            SubItem(name="转接头", parent_item=container_item),
+            SubItem(name="数据线", parent_item=container_item),
+        ]
+    )
+    db_session.commit()
+
+    response = client.get("/boxes")
+
+    assert response.status_code == 200
+    assert "当前概览" in response.text
+    assert "箱子总数" in response.text
+    assert "物品总数（不含子物品）" in response.text
+    assert "物品总数（含子物品）" in response.text
+    assert "平均每箱物品数" in response.text
+    assert "平均每个容器型 Item 的子物品数" in response.text
+    assert "箱子总数：</strong>2" in response.text
+    assert "物品总数（不含子物品）：</strong>3" in response.text
+    assert "物品总数（含子物品）：</strong>5" in response.text
+    assert "平均每箱物品数：</strong>1.5" in response.text
+    assert "平均每个容器型 Item 的子物品数：</strong>1.0" in response.text
+
+
+def test_boxes_overview_summary_handles_empty_data_safely(client):
+    response = client.get("/boxes")
+
+    assert response.status_code == 200
+    assert "当前概览" in response.text
+    assert "箱子总数：</strong>0" in response.text
+    assert "物品总数（不含子物品）：</strong>0" in response.text
+    assert "物品总数（含子物品）：</strong>0" in response.text
+    assert "平均每箱物品数：</strong>0.0" in response.text
+    assert "平均每个容器型 Item 的子物品数：</strong>0.0" in response.text
+
+
 def test_can_create_box(client, db_session):
     response = create_box(client, name="Kitchen Box")