Gemfile in u-attributes-0.10.0 vs Gemfile in u-attributes-0.11.0

@@ -1,6 +1,28 @@
-source "https://rubygems.org"
+source 'https://rubygems.org'
 
 gem 'simplecov', require: false, group: :test
+
+activemodel_version = ENV.fetch('ACTIVEMODEL_VERSION', '6.1')
+
+activemodel = case activemodel_version
+              when '3.2' then '3.2.22'
+              when '4.0' then '4.0.13'
+              when '4.1' then '4.1.16'
+              when '4.2' then '4.2.11'
+              when '5.0' then '5.0.7'
+              when '5.1' then '5.1.7'
+              when '5.2' then '5.2.3'
+              when '6.0' then '6.0.0.rc1'
+              end
+
+if activemodel_version < '6.1'
+  gem 'activemodel', activemodel
+  gem 'activesupport', activemodel
+end
+
+minitest = activemodel_version < '4.1' ? '~> 4.2' : '~> 5.0'
+
+gem 'minitest', minitest
 
 # Specify your gem's dependencies in u-attributes.gemspec
 gemspec