test(qwen-adapter): cover tab-container placeholder handling

Add query-level cases asserting an internal placeholder yields
`unknown`/`qwen_incomplete_response`, and that a resolved sibling field
is used as the answer when another field is still a placeholder.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/desktop-client/src/main/adapters/qwen.test.ts

@@ -1,6 +1,7 @@
 import { describe, expect, it } from 'vitest'
 
-import { __qwenTestUtils } from './qwen'
+import type { AdapterContext } from './base'
+import { __qwenTestUtils, qwenAdapter } from './qwen'
 
 const { extractQuestionText } = __qwenTestUtils
 
@@ -15,3 +16,81 @@ describe('qwen adapter helpers', () => {
     )
   })
 })
+
+describe('qwen adapter query result validation', () => {
+  it('does not submit an internal tab-container placeholder as a successful answer', async () => {
+    const page = {
+      waitForLoadState: async () => undefined,
+      url: () => 'https://www.qianwen.com/chat/demo',
+      goto: async () => undefined,
+      evaluate: async () => ({
+        ok: true as const,
+        url: 'https://www.qianwen.com/chat/demo',
+        question: {
+          model: 'Qwen',
+          deepSearch: '1',
+          enableSearch: true,
+          cardText: '测试问题',
+        },
+        answer: {
+          reqId: 'req-1',
+          status: 'finish',
+          content: {
+            multiLoadIframe: {
+              content: '[(tab_container_1)]',
+            },
+            searchResults: [{ url: 'https://example.com/source', title: '来源' }],
+          },
+          extraInfo: null,
+          communication: null,
+        },
+      }),
+    }
+    const context = {
+      playwright: { page, browser: {} },
+      reportProgress: () => undefined,
+    } as unknown as AdapterContext
+
+    const result = await qwenAdapter.query(context, { question_text: '测试问题' })
+
+    expect(result.status).toBe('unknown')
+    expect(result.error?.code).toBe('qwen_incomplete_response')
+  })
+
+  it('uses a resolved fallback answer when another content field is still a placeholder', async () => {
+    const page = {
+      waitForLoadState: async () => undefined,
+      url: () => 'https://www.qianwen.com/chat/demo',
+      goto: async () => undefined,
+      evaluate: async () => ({
+        ok: true as const,
+        url: 'https://www.qianwen.com/chat/demo',
+        question: {
+          model: 'Qwen',
+          deepSearch: '1',
+          enableSearch: true,
+          cardText: '测试问题',
+        },
+        answer: {
+          reqId: 'req-2',
+          status: 'finish',
+          content: {
+            multiLoadIframe: { content: '[(tab_container_1)]' },
+            barIframe: { content: '这是完整答案。' },
+          },
+          extraInfo: null,
+          communication: null,
+        },
+      }),
+    }
+    const context = {
+      playwright: { page, browser: {} },
+      reportProgress: () => undefined,
+    } as unknown as AdapterContext
+
+    const result = await qwenAdapter.query(context, { question_text: '测试问题' })
+
+    expect(result.status).toBe('succeeded')
+    expect(result.payload?.answer).toBe('这是完整答案。')
+  })
+})