Add specs for User#is_admin?

spec/support/controller_macros.rb

@@ -0,0 +1,19 @@
+module ControllerMacros
+  def login_user
+    # Before each test, create and login the user
+    before(:each) do
+      @request.env["devise.mapping"] = Devise.mappings[:user]
+      user = FactoryBot.create(:user)
+      # user.confirm! # Or set a confirmed_at inside the factory. Only necessary if you are using the "confirmable" module
+      sign_in user
+    end
+  end
+
+  # Not used in this tutorial, but left to show an example of different user types
+  # def login_admin
+  #   before(:each) do
+  #     @request.env["devise.mapping"] = Devise.mappings[:admin]
+  #     sign_in FactoryBot.create(:admin) # Using factory bot as an example
+  #   end
+  # end
+end