feat: adopt solution and close ticket

backend/apps/solutions/tests/test_solution_api.py

@@ -1,3 +1,4 @@
+from apps.solutions.models import Solution, TicketSolutionLink
 from apps.tickets.models import Ticket
 
 
@@ -66,3 +67,48 @@ def test_list_ticket_solutions_returns_linked_solution_details(admin_client, db)
     payload = response.json()
     assert payload[0]["link_type"] == "adopted"
     assert payload[0]["solution"]["title"] == "Restart callback worker"
+
+
+def test_adopt_solution_closes_ticket_and_records_resolution(admin_client, db):
+    ticket = Ticket.objects.create(
+        ticket_no="TK202607030300",
+        title="查询采集进度",
+        description="客户需要确认采集进度",
+        status="pending",
+    )
+    solution = Solution.objects.create(
+        title="查询采集进度处理方案",
+        problem_signature="采集进度查询",
+        root_cause="税局采集链路不稳定",
+        solution="查询 Python 日志，确认税局不稳定，仍在采集中。",
+        status="published",
+    )
+
+    response = admin_client.post(
+        f"/api/solutions/{solution.id}/adopt-ticket",
+        data={
+            "ticket_id": ticket.id,
+            "replied_to_customer": True,
+            "remark": "采纳方案并回复客户",
+        },
+        content_type="application/json",
+    )
+
+    assert response.status_code == 200
+    payload = response.json()
+    assert payload["link_type"] == "adopted"
+    assert payload["solution_usage_count"] == 1
+
+    ticket.refresh_from_db()
+    assert ticket.status == "closed"
+    assert ticket.resolution_summary == solution.solution
+    assert ticket.is_resolved is True
+    assert ticket.replied_to_customer is True
+    assert ticket.resolved_at is not None
+    assert ticket.closed_at is not None
+    assert TicketSolutionLink.objects.filter(
+        ticket=ticket,
+        solution=solution,
+        link_type="adopted",
+    ).exists()
+    assert ticket.events.filter(event_type="solution_adopted").exists()