Add activerecord to consent test environment

consent.gemspec

@@ -20,10 +20,12 @@ Gem::Specification.new do |spec|
   end
   spec.require_paths = ['lib']
 
+  spec.add_development_dependency 'activerecord', '>= 5'
   spec.add_development_dependency 'bundler', '>= 1.17.3'
   spec.add_development_dependency 'cancancan', '~> 1.15.0'
   spec.add_development_dependency 'pry', '~> 0.14.1'
   spec.add_development_dependency 'rake', '>= 12.3.3'
   spec.add_development_dependency 'rspec', '~> 3.0'
   spec.add_development_dependency 'rubocop', '~> 0.65.0'
+  spec.add_development_dependency 'sqlite3', '~> 1.4.2'
 end

spec/spec_helper.rb

@@ -7,6 +7,18 @@
 require 'date'
 
 SomeModel = Struct.new(:name, :created_at)
+require 'active_record'
+
+ActiveRecord::Base.establish_connection(
+  adapter: 'sqlite3',
+  database: File.join(__dir__, 'test.db')
+)
+
+RSpec.configure do |config|
+  config.around(:example) do |example|
+    ActiveRecord::Base.transaction(&example)
+  end
+end
 
 Consent.default_views[:no_access] = Consent::View.new('', 'No Access')
 Consent.load_subjects! [File.join(__dir__, 'permissions')]