How to test added elements?

Question

Software testing

Hello!
Help deal with the issue.
Started to master the profession and ran into a question.
Let's say we have a page. You can add an unlimited number of widgets with variable information (Weather for the selected location) to it, all widgets have the same functionality. You can delete all widgets except one. When the page is first loaded, 10 widgets are loaded.
Can they be considered equivalent? It's not possible to test them all. Or is it enough to test, for example, the 1st and 5th (First check on the border and second inside the border)?

Answer 1

There are two features here, they need to be tested separately:
1. Testing the functionality of the widget: choosing a city, displaying the weather, etc. (what else is there)
2. Testing the functionality of the page for working with widgets: adding, deleting, moving (and what else is there).
Therefore, testing "first and fifth" does not make sense. You test the first one "inside" (widget features), and consider the rest equivalent and test "outside" (page features).