Add memory leak test for allocating ST hashes

Test for commit f0d08d11dcd404f3146c0d71d6ff743bbc6e7193.

1 files changed, 9 insertions, 0 deletions

diff --git a/test/ruby/test_hash.rb b/test/ruby/test_hash.rb
index d9d1ca7dde..e66beef29f 100644
--- a/test/ruby/test_hash.rb
+++ b/test/ruby/test_hash.rb
@@ -219,6 +219,15 @@ class TestHash < Test::Unit::TestCase
     assert_equal('default', h['spurious'])
   end
 
+  def test_st_literal_memory_leak
+    assert_no_memory_leak([], "", "#{<<~'end;'}", rss: true)
+      1_000_000.times do
+        # >8 element hashes are ST allocated rather than AR allocated
+        {a: 1, b: 2, c: 3, d: 4, e: 5, f: 6, g: 7, h: 8, i: 9}
+      end
+    end;
+  end
+
   def test_try_convert
     assert_equal({1=>2}, Hash.try_convert({1=>2}))
     assert_equal(nil, Hash.try_convert("1=>2"))