Verify compaction references

test/openssl/utils.rb

@@ -29,6 +29,12 @@
   end
 end
 
+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
+
 require "test/unit"
 require "tempfile"
 require "socket"