Add GC.verify_compaction_references

test/helper.rb

@@ -62,5 +62,21 @@ def prepare_table
   session.execute(statement)
 end
 
+def verify_gc_compaction
+  # 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.
+  if defined?(GC.verify_compaction_references) == 'method'
+    if Gem::Version.new(RUBY_VERSION) >= Gem::Version.new('3.2.0')
+      GC.verify_compaction_references(expand_heap: true, toward: :empty)
+    else
+      GC.verify_compaction_references(double_heap: true, toward: :empty)
+    end
+  end
+end
+
+at_exit do
+  verify_gc_compaction
+end
+
 prepare_keyspace
 prepare_table