1 files changed, 18 insertions, 0 deletions
diff --git a/test/ruby/test_weakmap.rb b/test/ruby/test_weakmap.rb
index 86550cc221..9bbe2d6b81 100644
--- a/test/ruby/test_weakmap.rb
+++ b/test/ruby/test_weakmap.rb
@@ -176,4 +176,22 @@ class TestWeakMap < Test::Unit::TestCase
       end
     end;
   end
+
+  def test_compaction_bug_19529
+    obj = Object.new
+    100.times do |i|
+      GC.compact
+      @wm[i] = obj
+    end
+
+    assert_separately(%w(--disable-gems), <<-'end;')
+      wm = ObjectSpace::WeakMap.new
+      obj = Object.new
+      100.times do
+        wm[Object.new] = obj
+        GC.start
+      end
+      GC.compact
+    end;
+  end
 end