Why test static pages on Rspec in RoR?

Question

Ruby on Rails

Here's a simple test:

visit 'static_pages/home'
expect(page).to have_content('Sample App')

Why write this when you can just open the page and see?
I'm just a beginner in testing, and would like to hear from you constructively, what is the motive for such a test.

Answer 1

As a result of code refactoring, the page can be deleted, running the test will reveal this and make it possible to quickly fix it.
With this approach, why do tests at all? After all, you can check any functionality manually.