Functionality is working fine. Test case 3 and 4 are getting failed. I checked the test cases needs update. Test case 3 - Before attempting to access patientProfile.children, ensure patientProfile is not null. If patientProfile isn't rendered, the tests should fail gracefully with errors that make sense.

Test case 4 - When clicking the "Next" button in the final test (Clicking the next button should display the next patient), ensure that both nextBtn and DOM updates are handled as follows: React updates the DOM asynchronously, so using waitFor ensures the DOM has updated before running assertions. This avoids reading stale DOM elements (queryByTestId returning null).

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Really the problem and test cases 3 and 4 are problematic. I tried again many times but it still didn't work. Even though the author edited it and I also followed some of the ways that others entered, it still didn't work.

Alert is not working alert("Message") should display the alert, but it doesn't in this case. I verified that this line was being reached.

I tried a workaround with a state for the message, but the test didn't like that? Now what?

For the correct date format use: toLocaleDateString('en-US', { month: '2-digit', day: '2-digit', year: 'numeric' }). Thanks to the user who posted it couples of month ago.

Very good exercise but, SL is just awful. How should I use index+1 in SL? And what SL stands for?