1 files changed, 12 insertions, 0 deletions
diff --git a/test/ruby/test_module.rb b/test/ruby/test_module.rb
index 425cbdf031..dd8cc471d0 100644
--- a/test/ruby/test_module.rb
+++ b/test/ruby/test_module.rb
@@ -3318,6 +3318,18 @@ class TestModule < Test::Unit::TestCase
     CODE
   end
 
+  def test_module_clone_memory_leak
+    # [Bug #19901]
+    assert_no_memory_leak([], <<~PREP, <<~CODE, rss: true)
+      code = proc do
+        Module.new.clone
+      end
+      1_000.times(&code)
+    PREP
+      1_000_000.times(&code)
+    CODE
+  end
+
   private
 
   def assert_top_method_is_private(method)