Add a test case for type_cast behaviour

test/enumerations_test.rb

@@ -1,7 +1,9 @@
+# frozen_string_literal: true
+
 require_relative 'helpers/test_helper'
 require 'enumerations/errors'
 
-class EnumerationsTest < Minitest::Test
+class EnumerationsTest < Minitest::Test # rubocop:disable Metrics/ClassLength
   def test_reflect_on_all_enumerations
     enumerations = Post.reflect_on_all_enumerations
 
@@ -157,4 +159,12 @@ def test_on_nil_value_assignment
     user = User.new(role: nil)
     assert_nil user.role
   end
+
+  def test_type_cast_when_saving_value_to_database
+    client = ApiClient.new(api_client_permission: ApiClientPermission.people_first_name)
+    client.save
+
+    # overriding to_s doesn't have an effect on the value saved to the database
+    assert_equal 'people_first_name', client[:api_client_permission]
+  end
 end

test/helpers/database_helper.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'logger'
 
 ActiveRecord::Base.establish_connection(adapter: 'sqlite3', database: ':memory:')
@@ -21,4 +23,8 @@
   create_table :overridable_models, force: true do |t|
     t.integer :overridable_status_id
   end
+
+  create_table :api_clients, force: true do |t|
+    t.string :api_client_permission
+  end
 end

test/helpers/test_helper.rb

@@ -31,6 +31,19 @@ def my_custom_name
   end
 end
 
+class ApiClientPermission < Enumerations::Base
+  value :people_first_name, id: 'people.first_name'
+  value :people_last_name, id: 'people.last_name'
+
+  def to_s
+    id
+  end
+end
+
+class ApiClient < ActiveRecord::Base
+  enumeration :api_client_permission
+end
+
 class Post < ActiveRecord::Base
   enumeration :status
   enumeration :different_status, foreign_key: :some_other_status, class_name: 'Status'