LuisSanchez commented on code in PR #36486:
URL: https://github.com/apache/superset/pull/36486#discussion_r2625205211


##########
superset-frontend/packages/superset-ui-core/src/components/TimezoneSelector/TimezoneSelector.DaylightSavingTime.test.tsx:
##########
@@ -37,25 +37,55 @@ afterEach(() => {
 });
 
 test('render timezones in correct order for daylight saving time', async () => 
{
+  // Set system time BEFORE loading component to ensure cache uses correct date
+  jest.useFakeTimers();
+  jest.setSystemTime(new Date('2022-07-01'));
+
   const TimezoneSelector = await loadComponent('2022-07-01');
   const onTimezoneChange = jest.fn();
-  render(
+  const { container } = render(
     <TimezoneSelector
       onTimezoneChange={onTimezoneChange}
       timezone="America/Nassau"
     />,
   );
 
+  // Trigger data loading by clicking the select
   const searchInput = screen.getByRole('combobox');
   await userEvent.click(searchInput);
 
+  // Run timers to execute queueMicrotask/setTimeout callback
+  jest.runAllTimers();
+
+  // Wait for timezone data to load
+  await waitFor(() => {
+    expect(screen.queryByText('Loading...')).not.toBeInTheDocument();
+  });
+
+  // Verify the selected timezone is displayed correctly (in DST)
+  const selectionItem = container.querySelector('.ant-select-selection-item');
+  expect(selectionItem).toHaveTextContent('GMT -04:00 (Eastern Daylight 
Time)');

Review Comment:
   Suggestion taken into consideration on latest commit



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