feat: support image inputs in assistant tests

backend/routes/test_cases.py

@@ -9,6 +9,7 @@ from db.models import TestCase, TestRunCase, TestSuite
 from db.session import get_session
 from fastapi import APIRouter, Depends, HTTPException, Query
 from services.auth import require_admin
+from services.test_case_assets import canonicalize_test_assets
 from sqlalchemy import func, select
 from sqlalchemy.ext.asyncio import AsyncSession
 from test_schemas import (
@@ -79,13 +80,6 @@ def _case_out(row: TestCase) -> TestCaseOut:
     )
 
 
-def _apply_case_write(row: TestCase, body: TestCaseWrite) -> None:
-    row.name = body.name.strip()
-    row.description = body.description.strip()
-    row.input_mode = body.input_mode
-    row.definition = body.definition().model_dump(mode="json", by_alias=True)
-
-
 async def _renumber_cases(session: AsyncSession, suite_id: str) -> None:
     rows = (
         await session.execute(
@@ -232,13 +226,18 @@ async def create_test_case(
     max_order = await session.scalar(
         select(func.max(TestCase.sort_order)).where(TestCase.suite_id == suite_id)
     )
+    definition = body.definition()
+    try:
+        await canonicalize_test_assets(session, definition)
+    except ValueError as exc:
+        raise HTTPException(422, str(exc)) from exc
     row = TestCase(
         id=_new_id("tc"),
         suite_id=suite_id,
         name=body.name.strip(),
         description=body.description.strip(),
         input_mode=body.input_mode,
-        definition=body.definition().model_dump(mode="json", by_alias=True),
+        definition=definition.model_dump(mode="json", by_alias=True),
         sort_order=int(max_order if max_order is not None else -1) + 1,
         last_result="not_run",
     )
@@ -315,7 +314,15 @@ async def update_test_case(
     row = await session.get(TestCase, case_id)
     if row is None:
         raise HTTPException(404, "测试用例不存在")
-    _apply_case_write(row, body)
+    definition = body.definition()
+    try:
+        await canonicalize_test_assets(session, definition)
+    except ValueError as exc:
+        raise HTTPException(422, str(exc)) from exc
+    row.name = body.name.strip()
+    row.description = body.description.strip()
+    row.input_mode = body.input_mode
+    row.definition = definition.model_dump(mode="json", by_alias=True)
     await _touch_suite(session, row.suite_id)
     await session.commit()
     await session.refresh(row)