Fix factory bot integration and add minitest support (#71)

lib/packs/rails/integrations/factory_bot.rb

@@ -9,6 +9,7 @@ def initialize(app)
 
           Packs.all.reject(&:is_gem?).each do |pack|
             app.config.factory_bot.definition_file_paths << pack.relative_path.join("spec/factories").to_s
+            app.config.factory_bot.definition_file_paths << pack.relative_path.join("test/factories").to_s
           end
         end
       end

lib/packs/rails/railtie.rb

@@ -5,12 +5,15 @@ module Rails
     class Railtie < ::Rails::Railtie
       config.before_configuration do |app|
         Integrations::Rails.new(app)
-        Integrations::FactoryBot.new(app)
-
+
         # This is not used within packs-rails. Rather, this allows OTHER tools to
         # hook into packs-rails via ActiveSupport hooks.
         ActiveSupport.run_load_hooks(:packs_rails, Packs)
       end
+
+      config.after_initialize do |app|
+        Integrations::FactoryBot.new(app)
+      end
     end
   end
 end