test: Add test clarifying expected state during partial error scenario

Author: pulpdrew

packages/app/src/hooks/__tests__/useChartConfig.test.tsx

@@ -936,6 +936,54 @@ describe('useChartConfig', () => {
       expect(result.current.error).toBe(mockError);
     });
 
+    it('has an error status with partial data after the second chunk fails to fetch', async () => {
+      const mockError = new Error('Query failed');
+      const mockSuccess = createMockQueryResponse([
+        {
+          'count()': '71',
+          __hdx_time_bucket: '2025-10-01T18:00:00Z',
+        },
+      ]);
+
+      mockClickhouseClient.queryChartConfig
+        .mockResolvedValueOnce(mockSuccess)
+        .mockRejectedValueOnce(mockError);
+
+      const onError = jest.fn();
+      const config = createMockChartConfig({
+        dateRange: [
+          new Date('2025-10-01 00:00:00Z'),
+          new Date('2025-10-02 00:00:00Z'),
+        ],
+        granularity: '3 hour',
+      });
+
+      const { result } = renderHook(
+        () =>
+          useQueriedChartConfig(config, {
+            onError,
+            retry: false,
+            enableQueryChunking: true,
+          }),
+        {
+          wrapper,
+        },
+      );
+
+      await waitFor(() => expect(result.current.isError).toBe(true));
+      expect(result.current.isFetching).toBe(false);
+      expect(result.current.isSuccess).toBe(false);
+
+      expect(result.current.error).toBe(mockError);
+      expect(onError).toHaveBeenCalledWith(mockError);
+      expect(result.current.data).toEqual({
+        data: mockSuccess.data,
+        meta: mockSuccess.meta,
+        rows: mockSuccess.rows,
+        isComplete: false,
+      });
+    });
+
     it('does not make requests if it is disabled', async () => {
       const config = createMockChartConfig({
         dateRange: [