test(web-shell): pin silent failure of background artifact refreshes (#7427)

packages/web-shell/client/hooks/useSessionArtifacts.test.tsx

@@ -215,4 +215,73 @@ describe('useSessionArtifacts', () => {
       'replacement',
     ]);
   });
+
+  it('keeps automatic refresh failures silent and recovers on the next refresh (#7427)', async () => {
+    // A transient `Failed to fetch` on an automatic refresh is noise the user
+    // cannot act on. The panel keeps last-good artifacts when it has them,
+    // clears `loading`, and exposes no error state.
+    sdkMock.actions.loadArtifacts
+      .mockRejectedValueOnce(new Error('Failed to fetch'))
+      .mockResolvedValueOnce({ artifacts: [artifact('current-artifact')] })
+      .mockRejectedValueOnce(new Error('Failed to fetch'))
+      .mockRejectedValueOnce(new Error('Failed to fetch'))
+      .mockResolvedValueOnce({ artifacts: [artifact('recovered-artifact')] });
+
+    await renderHookHost();
+
+    // Automatic refresh #1: initial mount fails before any last-good data exists.
+    await act(async () => {
+      await Promise.resolve();
+    });
+    expect(latestState?.loading).toBe(false);
+    expect(latestState?.error).toBeNull();
+    expect(latestState?.artifacts).toEqual([]);
+
+    // Automatic refresh #2: artifactsVersion recovers and establishes last-good.
+    sdkMock.artifactsVersion = 1;
+    await rerenderHookHost();
+    await act(async () => {
+      await Promise.resolve();
+    });
+    expect(latestState?.artifacts.map((item) => item.id)).toEqual([
+      'current-artifact',
+    ]);
+    expect(latestState?.loading).toBe(false);
+
+    // Automatic refresh #3: prompt settling back to idle fails transiently.
+    sdkMock.promptStatus = 'running';
+    await rerenderHookHost();
+    sdkMock.promptStatus = 'idle';
+    await rerenderHookHost();
+    await act(async () => {
+      await Promise.resolve();
+    });
+    expect(latestState?.loading).toBe(false);
+    expect(latestState?.error).toBeNull();
+    expect(latestState?.artifacts.map((item) => item.id)).toEqual([
+      'current-artifact',
+    ]);
+
+    // Automatic refresh #4: artifactsVersion fails and still keeps last-good.
+    sdkMock.artifactsVersion = 2;
+    await rerenderHookHost();
+    await act(async () => {
+      await Promise.resolve();
+    });
+    expect(latestState?.loading).toBe(false);
+    expect(latestState?.error).toBeNull();
+    expect(latestState?.artifacts.map((item) => item.id)).toEqual([
+      'current-artifact',
+    ]);
+
+    // The panel is not wedged: the next automatic refresh recovers.
+    sdkMock.artifactsVersion = 3;
+    await rerenderHookHost();
+    await act(async () => {
+      await Promise.resolve();
+    });
+    expect(latestState?.artifacts.map((item) => item.id)).toEqual([
+      'recovered-artifact',
+    ]);
+  });
 });