1 files changed, 113 insertions, 0 deletions
diff --git a/frontend/src/lib/datasetCardRetry.test.ts b/frontend/src/lib/datasetCardRetry.test.ts
new file mode 100644
index 0000000..df9dc31
--- /dev/null
+++ b/frontend/src/lib/datasetCardRetry.test.ts
@@ -0,0 +1,113 @@
+import { describe, expect, it, vi, beforeEach, afterEach } from 'vitest';
+import { render, screen, fireEvent, waitFor, cleanup } from '@testing-library/svelte';
+
+vi.mock('../lib/client', () => {
+  const real = vi.importActual<typeof import('../lib/client')>('../lib/client');
+  return {
+    ...real,
+    getDataset: vi.fn(),
+    getDatasetPreview: vi.fn(),
+    createDataset: vi.fn()
+  };
+});
+
+import DatasetCard from '../components/DatasetCard.svelte';
+import { getDataset, createDataset } from '../lib/client';
+import type { Dataset } from '../lib/types';
+
+const failedDs: Dataset = {
+  id: 'ds-failed-1',
+  name: '国泰自由现金流-20251231-20260917',
+  request: {
+    name: '国泰自由现金流-20251231-20260917',
+    instruments: [
+      { symbol: '159399', market: 'SZ', asset_type: 'etf', name: '国泰自由现金流', currency: null }
+    ],
+    start_date: '2025-12-31',
+    end_date: '2026-09-17',
+    frequency: 'daily',
+    adjustment: 'none',
+    fields: ['open', 'high', 'low', 'close', 'volume']
+  },
+  status: 'failed',
+  error: '159399: eastmoney failed (RemoteDisconnected); tencent fallback failed (tencent source has no listed-ETF daily adapter)',
+  created_at: '2026-09-17T01:00:00Z'
+};
+
+beforeEach(() => {
+  vi.mocked(getDataset).mockResolvedValue(failedDs);
+  vi.mocked(createDataset).mockReset();
+});
+
+afterEach(() => cleanup());
+
+describe('failed dataset retry affordance (159399 regression: user could never re-request)', () => {
+  it('failed dataset offers recreate-with-same-request button and original error stays visible', async () => {
+    render(DatasetCard, { props: { dsId: 'ds-failed-1' } });
+    await screen.findByText(/eastmoney failed/);
+    const btn = await screen.findByRole('button', { name: /使用相同请求重新获取/ });
+    expect(btn).toBeTruthy();
+  });
+
+  it('recreate preserves ds.name (canonical request has no name) via the normal create API and keeps the failed record untouched', async () => {
+    vi.mocked(createDataset).mockResolvedValue({
+      ...failedDs,
+      id: 'ds-new-2',
+      status: 'pending',
+      error: null
+    });
+    render(DatasetCard, { props: { dsId: 'ds-failed-1' } });
+    const btn = await screen.findByRole('button', { name: /使用相同请求重新获取/ });
+    await fireEvent.click(btn);
+    await waitFor(() => {
+      expect(createDataset).toHaveBeenCalledTimes(1);
+    });
+    expect(vi.mocked(createDataset).mock.calls[0][0]).toStrictEqual({
+      ...failedDs.request,
+      name: failedDs.name,
+      instruments: [{ ...failedDs.request.instruments[0], currency: null }]
+    });
+    // new dataset becomes visible/trackable: hint points to the list below
+    await screen.findByText(/新数据集出现在下方列表并自动跟踪进度/);
+  });
+
+  it('recreate button is disabled after a successful recreate (no duplicate submissions), error clears button state instead', async () => {
+    vi.mocked(createDataset).mockResolvedValue({
+      ...failedDs,
+      id: 'ds-new-3',
+      status: 'pending',
+      error: null
+    });
+    render(DatasetCard, { props: { dsId: 'ds-failed-1' } });
+    const btn = await screen.findByRole('button', { name: /使用相同请求重新获取/ });
+    expect((btn as HTMLButtonElement).disabled).toBe(false);
+    await fireEvent.click(btn);
+    await screen.findByText(/已用原请求创建新数据集/);
+    const done = screen.getByRole('button', { name: /使用相同请求重新获取/ });
+    expect((done as HTMLButtonElement).disabled).toBe(true);
+  });
+
+  it('onRecreated callback fires with the new dataset so parents can refresh', async () => {
+    vi.mocked(createDataset).mockResolvedValue({
+      ...failedDs,
+      id: 'ds-new-4',
+      status: 'pending',
+      error: null
+    });
+    const onRecreated = vi.fn();
+    render(DatasetCard, { props: { dsId: 'ds-failed-1', onRecreated } });
+    const btn = await screen.findByRole('button', { name: /使用相同请求重新获取/ });
+    await fireEvent.click(btn);
+    await screen.findByText(/已用原请求创建新数据集/);
+    expect(onRecreated).toHaveBeenCalledTimes(1);
+    expect(onRecreated.mock.calls[0][0].id).toBe('ds-new-4');
+  });
+
+  it('recreate failure surfaces the error message instead of a silent no-op', async () => {
+    vi.mocked(createDataset).mockRejectedValue(new Error('HTTP400: validation'));
+    render(DatasetCard, { props: { dsId: 'ds-failed-1' } });
+    const btn = await screen.findByRole('button', { name: /使用相同请求重新获取/ });
+    await fireEvent.click(btn);
+    await screen.findByText(/重新获取失败/);
+  });
+});