diff --git a/test/heap-dumps.tar.bz2 b/test/heap-dumps.tar.bz2
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index 0000000..463391e
Binary files /dev/null and b/test/heap-dumps.tar.bz2 differ
diff --git a/test/leak.rb b/test/leak.rb
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--- /dev/null
+++ b/test/leak.rb
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+require 'objspace'
+
+class Leaky
+  def self.leak
+    @leak ||= []
+  end
+
+  def doit
+    noleak = []
+
+    50.times do
+      self.class.leak << 'leaked memory'
+      noleak << 'not leaked'
+    end
+  end
+end
+
+def dump_heap(filename)
+  GC.start
+  File.open(filename, 'w') { |file| ObjectSpace.dump_all(output: file) }
+end
+
+Leaky.new.doit
+dump_heap('heap1.jsonl')
+Leaky.new.doit
+dump_heap('heap2.jsonl')
+Leaky.new.doit
+dump_heap('heap3.jsonl')