Testing a concern / module that uses ActiveRecord

Question

SCENARIO I have extracted a concern called Taggable. It\'s a module that allows any model to support tagging. I have included

Answer 1

Here is my solution of similar problem:

describe Taggable do
  subject { mock_model('User').send(:extend, Taggable) }

  it { should have_many(:tags) }
  ...

  describe "#tag" do
    ...
  end
end

In fact mock_model('User') can mock any existent model in the system.

This is not an ideal solution but at least it's clear and mocks everything.

Note: mock_model (AR mocks) were extracted to rspec-activemodel-mocks in rspec 3.0.
Also you need to use shoulda-matchers for associations matchers.