Bring user factory from spree_core and merge with modification

spec/factories/user_factory.rb

@@ -1,9 +1,19 @@
-FactoryBot.modify do
-  factory :user do
+FactoryBot.define do
+  sequence :user_authentication_token do |n|
+    "xxxx#{Time.now.to_i}#{rand(1000)}#{n}xxxxxxxxxxxxx"
+  end
+
+  factory :user, class: Spree.user_class do
     transient do
       enterprises []
     end
 
+    email { generate(:random_email) }
+    login { email }
+    password 'secret'
+    password_confirmation { password }
+    authentication_token { generate(:user_authentication_token) } if Spree.user_class.attribute_method? :authentication_token
+
     confirmation_sent_at '1970-01-01 00:00:00'
     confirmed_at '1970-01-01 00:00:01'
 
@@ -21,15 +31,14 @@ FactoryBot.modify do
       user.spree_roles.clear # Remove admin role
 
       user.enterprises << proxy.enterprises
-    end
-  end
+    end    
 
-  factory :admin_user do
-    confirmation_sent_at '1970-01-01 00:00:00'
-    confirmed_at '1970-01-01 00:00:01'
+    factory :admin_user do
+      spree_roles { [Spree::Role.find_by(name: 'admin') || create(:role, name: 'admin')] }
 
-    after(:create) do |user|
-      user.spree_roles << Spree::Role.find_or_create_by!(name: 'admin')
+      after(:create) do |user|
+        user.spree_roles << Spree::Role.find_or_create_by!(name: 'admin')
+      end      
     end
   end
 end