Ruby on rails difference between Integration and Functional testing

Question

I am wondering, if I use Integration testing, is functional testing necessary? And what about Acceptance testing? I am struggling to understand, if I can stick to Integration testing and then just forget about Functional testing?

Answer 1

From the official Rails guide:

In Rails, testing the various actions of a controller is a form of writing functional tests.

http://guides.rubyonrails.org/testing.html#functional-tests-for-your-controllers

Integration tests are used to test how various parts of our application interact.

http://guides.rubyonrails.org/testing.html#integration-testing

Answer 2

Quick answer: integration testing is essentially a subset of functional testing, and acceptance testing is a form of functional testing.

I recommend reading the wikipedia articles on the subject. Keep in mind that the definitions of the various kinds of testing can be taken with a grain of salt.