How to make a uint-test adding to the database?

Question

Unit testing

PHP language. I want to test whether the registration on the site is broken.
There is a plan to generate an e-mail like microtime(true)@domain.ru in the test and write it to the database using a method from the User class (this is the key point that the test does not write itself, in fact we are testing this method), but the test should immediately request the result from the database and check if it is there.
Is this already integration testing and not Unit?
How to do it correctly, in particular, is it possible and how to pass a connection to the database to the test class?
And is it all correct? I don’t know how else, I don’t understand mocks and stubs yet ((

Answer 1

PHPUnit Manual :: Chapter 8. Database Testing