Does it make sense to test model validations in Ruby on Rails?

Question

Software testing

In one video I saw where it says that there is no point in testing model validations explaining that
they will not fail, and in another place I saw how validation tests are written.
Who is right? Who does not violate the concept of testing?

Answer 1

You don't need to test the framework. That is, for example, in the presence validation test, you don’t need to check that both an empty string will work and nil will work, and something else. But, there should still be some kind of test, because if another programmer removes this validation, the test should fail somewhere 100%. If it had to be deleted, the developer will delete the test, if he accidentally deleted it, the test fell, he fixed it. Tests are needed for this - for teamwork and the ability to change the code.
Rspec is very easy to test rail standard validations, gem shoulda

Answer 2

Of course, you don't need unittests.
But for functional testing, it's a must.