BigDecimal required; test fixes for ruby 3 (#408)

Appraisals

@@ -29,6 +29,7 @@ end
 
 appraise 'mongoid-5.0' do
   gem 'mongoid', '~> 5.0.0'
+  gem 'bigdecimal', '~> 1.3.5'
 end
 
 appraise 'mongoid-6.0' do

gemfiles/mongoid_5.0.gemfile

@@ -3,5 +3,6 @@
 source "https://rubygems.org"
 
 gem "mongoid", "~> 5.0.0"
+gem "bigdecimal", "~> 1.3.5"
 
 gemspec path: "../"

spec/ext/active_record_spec.rb

@@ -218,25 +218,43 @@ class SubUser < User {
       # spec 1
       out = @ap.awesome(User.methods.grep(/first/))
 
+      if RUBY_VERSION >= '3.0.0'
+        expect(out).to match(/\sfirst\(\*\*,\s&&\)/)
+      elsif RUBY_VERSION >= '2.7.0'
+        if ActiveRecord::VERSION::STRING >= '3.2'
+          expect(out).to match(/\sfirst\(\*\*,\s&&\)\s+User/)
+        else
+          expect(out).to match(/\sfirst\(\*\*,\s&&\)\s+User \(ActiveRecord::Base\)/)
+        end
+      else
         if ActiveRecord::VERSION::STRING >= '3.2'
           expect(out).to match(/\sfirst\(\*arg.*?\)\s+User/)
         else
           expect(out).to match(/\sfirst\(\*arg.*?\)\s+User \(ActiveRecord::Base\)/)
         end
+      end
 
       # spec 2
       out = @ap.awesome(User.methods.grep(/primary_key/))
+      if RUBY_VERSION >= '3.0.0'
+        expect(out).to match(/\sprimary_key\(.*?\)/)
+      else
         expect(out).to match(/\sprimary_key\(.*?\)\s+User/)
+      end
 
       # spec 3
       out = @ap.awesome(User.methods.grep(/validate/))
-
       if ActiveRecord::VERSION::MAJOR < 3
         expect(out).to match(/\svalidate\(\*arg.*?\)\s+User \(ActiveRecord::Base\)/)
+      else
+        if RUBY_VERSION >= '3.0.0'
+          expect(out).to match(/\svalidate\(\*arg.*?\)/)
         else
           expect(out).to match(/\svalidate\(\*arg.*?\)\s+User/)
         end
+      end
 
     end
   end
 end
+