Run GC.verify_compaction_references on CI (#1155)

Co-authored-by: Jean Boussier <[email protected]>

Author: casperisfine

spec/spec_helper.rb

@@ -4,6 +4,12 @@
 require 'yaml'
 DatabaseCredentials = YAML.load_file('spec/configuration.yml')
 
+if GC.respond_to?(:verify_compaction_references)
+  # This method was added in Ruby 3.0.0. Calling it this way asks the GC to
+  # move objects around, helping to find object movement bugs.
+  GC.verify_compaction_references(double_heap: true, toward: :empty)
+end
+
 RSpec.configure do |config|
   config.disable_monkey_patching!