Is testing sufficient?

Question

The name reads everything if I test with capybara:

visit this page
expect this content 

and do it for every single function (e.g. signin, signup, search, click all links and buttons, etc.), would that be enough? Why do I need to test controllers and models? If functions work properly, does that not mean that everything works in harmony?

Answer 1

This technique is called black box testing, also known as functional testing. If you test as if you are an application user, it is considered a black box. If you test it from the inside out, it is considered a glass box test.

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