How to mock a nonexistent class with Rspec Mock

Question

I’m creating a lib that will use a model pattern of Rails, only that for the development of this lib I need to test without the presence of this model.

So think about mocking (I’m using Gem rspec-mock), tried so:

it '#user_autenticated?' do
  allow('User').to receive(:where).and_return([double('User', cpf: '00011122233344')])

  auth = Rbot::Auth.new(maestro)
  expect(auth.user_autenticated?).not_to be nil
end

But unfortunately I get the error:

"User" does not implement: where

Does anyone know a way out of this problem?

Answer 1

I believe you can do it in many ways, but for your case that you need an Activerecord method, the best option would be mock_model.

Something like:

user = mock_model(User)
allow(user).to receive(:where).and_return([double('User', cpf: '00011122233344')])

Or if you are already using Factorygirl

FactoryGirl.build_stubbed(:user)

This post contains more details: https://www.agileventures.org/articles/testing-with-rspec-stubs-mocks-factories-what-to-choose