From 2bc1a7e347174c2bf14bc8d0e661f150ff101a3e Mon Sep 17 00:00:00 2001
From: _Kerman <kermanx@qq.com>
Date: Wed, 9 Sep 2026 19:52:42 +0800
Subject: [PATCH] test(trajectory): pin thinking defaults when switching
 records

---
 .../ui-trajectory/tests/table.client.spec.tsx | 20 +++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/packages/client/ui-trajectory/tests/table.client.spec.tsx b/packages/client/ui-trajectory/tests/table.client.spec.tsx
index 9723935bd4..5a882141bb 100644
--- a/packages/client/ui-trajectory/tests/table.client.spec.tsx
+++ b/packages/client/ui-trajectory/tests/table.client.spec.tsx
@@ -273,6 +273,26 @@ describe('TrajectoryTable', () => {
     expect(screen.getByRole('button', { name: 'Thinking' }).getAttribute('aria-expanded')).toBe('true')
   })
 
+  it('opens thinking on another record after collapsing the selected record', () => {
+    const turns: readonly TrajectoryTurnModel[] = [{
+      turn: 1,
+      groups: [{
+        title: 'Step 1',
+        cells: [1, 2].map(index => ({
+          index, kind: 'message', text: `Answer ${index}`, outputDetail: `Answer ${index}`,
+          thinkingDetail: `Reasoning ${index}`, timeSeconds: 1,
+        })),
+      }],
+    }]
+    render(<TrajectoryTable turns={turns} {...FOLD_PROPS} />)
+    fireEvent.click(screen.getByRole('row', { name: /ASSISTANT, Answer 1/ }))
+    fireEvent.click(screen.getByRole('button', { name: 'Thinking' }))
+    expect(screen.getByRole('button', { name: 'Thinking' }).getAttribute('aria-expanded')).toBe('false')
+    fireEvent.click(screen.getByRole('row', { name: /ASSISTANT, Answer 2/ }))
+    expect(screen.getByRole('button', { name: 'Thinking' }).getAttribute('aria-expanded')).toBe('true')
+    expect(screen.getByText('Reasoning 2')).toBeTruthy()
+  })
+
   it('keeps raw HTML tags in a Markdown-derived context preview', () => {
     const html = [
       '<background-job-complete id="trajectory-ui-watch">',