Revert "Remove overly specific unit test that does not seem necessary"

This reverts commit c056aa8.

website/src/components/SearchPage/fields/AutoCompleteField.spec.tsx

@@ -145,6 +145,36 @@ describe('AutoCompleteField', () => {
         expect(screen.getByText('No options available')).toBeInTheDocument();
     });
 
+    it('calls setAFieldValue, when an option is selected', async () => {
+        mockUseAggregated.mockReturnValue({
+            data: {
+                data: [
+                    { testField: 'Option 1', count: 10 },
+                    { testField: 'Option 2', count: 20 },
+                ],
+            },
+            isLoading: false,
+            error: null,
+            mutate: vi.fn(),
+        });
+        render(
+            <AutoCompleteField
+                field={field}
+                setAFieldValue={setAFieldValue}
+                lapisUrl={lapisUrl}
+                lapisSearchParameters={lapisSearchParameters}
+            />,
+        );
+
+        const input = screen.getByLabelText('Test Field');
+        fireEvent.focus(input);
+
+        const options = await screen.findAllByRole('option');
+        fireEvent.click(options[0]);
+
+        expect(setAFieldValue).toHaveBeenCalledWith('testField', 'Option 1');
+    });
+
     it('clears input value on clear button click', async () => {
         mockUseAggregated.mockReturnValue({
             data: {