Add failing optional test
diff --git a/tests/test_stl.py b/tests/test_stl.py
index 2335cb9..6137963 100644
--- a/tests/test_stl.py
+++ b/tests/test_stl.py
@@ -127,6 +127,11 @@
 
     assert m.nodefer_none_optional(None)
 
+    holder = m.OptionalHolder()
+    mvalue = holder.member
+    assert mvalue.initialized
+    assert holder.member_initialized()
+
 
 @pytest.mark.skipif(not hasattr(m, "has_exp_optional"), reason='no <experimental/optional>')
 def test_exp_optional():
@@ -148,6 +153,11 @@
     assert m.test_no_assign_exp(m.NoAssign(43)) == 43
     pytest.raises(TypeError, m.test_no_assign_exp, 43)
 
+    holder = m.OptionalExpHolder()
+    mvalue = holder.member
+    assert mvalue.initialized
+    assert holder.member_initialized()
+
 
 @pytest.mark.skipif(not hasattr(m, "load_variant"), reason='no <variant>')
 def test_variant(doc):