add compatibility / tests for Ruby 4

Author: kratob

.github/workflows/test.yml

@@ -24,6 +24,8 @@ jobs:
             gemfile: Gemfile.8.0.sqlite3
           - ruby: "3.4.7"
             gemfile: Gemfile.8.1.sqlite3
+          - ruby: "4.0.1"
+            gemfile: Gemfile.8.1.sqlite3
     env:
       BUNDLE_GEMFILE: ${{ matrix.gemfile }}
 

spec/active_type/object_spec.rb

@@ -1,5 +1,4 @@
 require 'spec_helper'
-require 'ostruct'
 
 module ObjectSpec
 
@@ -255,9 +254,8 @@ class ObjectWithUnsupportedTypes < Object
       subject.virtual_time = t
       subject.virtual_date = Date.today
       subject.virtual_boolean = true
-      subject.virtual_attribute = OpenStruct.new({:test => "openstruct"})
 
-      expect(subject.inspect).to eq("#<ObjectSpec::Object virtual_attribute: #<OpenStruct test=\"openstruct\">, virtual_boolean: true, virtual_date: \"#{Date.today}\", virtual_integer: 17, virtual_string: \"string\", virtual_time: \"#{t.to_formatted_s(:db)}\", virtual_type_attribute: nil>")
+      expect(subject.inspect).to eq("#<ObjectSpec::Object virtual_attribute: nil, virtual_boolean: true, virtual_date: \"#{Date.today}\", virtual_integer: 17, virtual_string: \"string\", virtual_time: \"#{t.to_formatted_s(:db)}\", virtual_type_attribute: nil>")
     end
 
   end

spec/active_type/record_spec.rb

@@ -1,5 +1,4 @@
 require 'spec_helper'
-require 'ostruct'
 
 module RecordSpec
 
@@ -203,9 +202,8 @@ class RecordWithOptionalBelongsToFlippedValidatesForeignKey < Record
       subject.virtual_time = t
       subject.virtual_date = Date.today
       subject.virtual_boolean = true
-      subject.virtual_attribute = OpenStruct.new({:test => "openstruct"})
 
-      expect(subject.inspect).to eq("#<RecordSpec::Record id: nil, persisted_boolean: nil, persisted_date: nil, persisted_integer: 20, persisted_string: \"persisted string\", persisted_time: nil, virtual_attribute: #<OpenStruct test=\"openstruct\">, virtual_boolean: true, virtual_date: \"#{Date.today}\", virtual_integer: 17, virtual_string: \"string\", virtual_time: \"#{t.to_formatted_s(:db)}\", virtual_type_attribute: nil>")
+      expect(subject.inspect).to eq("#<RecordSpec::Record id: nil, persisted_boolean: nil, persisted_date: nil, persisted_integer: 20, persisted_string: \"persisted string\", persisted_time: nil, virtual_attribute: nil, virtual_boolean: true, virtual_date: \"#{Date.today}\", virtual_integer: 17, virtual_string: \"string\", virtual_time: \"#{t.to_formatted_s(:db)}\", virtual_type_attribute: nil>")
     end
 
   end