Add Callout specs

spec/factories/callouts.rb

+FactoryBot.define do
+  factory :callout do
+    feature_name 'test_callout'
+    dismissed_state false
+
+    user
+  end
+end

spec/models/callout_spec.rb

+require 'rails_helper'
+
+describe Callout do
+  let(:callout) { create(:callout) }
+
+  describe 'relationships' do
+    it { is_expected.to belong_to(:user) }
+  end
+end