diff --git a/test/sp_unique_ptr_test.cpp b/test/sp_unique_ptr_test.cpp
index 7656e75..69bbaf9 100644
--- a/test/sp_unique_ptr_test.cpp
+++ b/test/sp_unique_ptr_test.cpp
@@ -95,6 +95,60 @@ int main()
         p2 = std::unique_ptr<X>( new X );
         BOOST_TEST( X::instances == 1 );
 
+        p2 = std::unique_ptr<X>( new X );
+        BOOST_TEST( X::instances == 1 );
+
+        p2.reset();
+        BOOST_TEST( X::instances == 0 );
+    }
+
+    {
+        BOOST_TEST( X::instances == 0 );
+
+        std::unique_ptr<X> p( new X );
+        BOOST_TEST( X::instances == 1 );
+
+        boost::shared_ptr<X const> p2( std::move( p ) );
+        BOOST_TEST( X::instances == 1 );
+        BOOST_TEST( p.get() == 0 );
+
+        boost::shared_ptr<X const> p3 = p2->shared_from_this();
+        BOOST_TEST( p2 == p3 );
+        BOOST_TEST( !(p2 < p3) && !(p3 < p2) );
+
+        p2.reset();
+        p3.reset();
+        BOOST_TEST( X::instances == 0 );
+
+        p2 = std::unique_ptr<X>( new X );
+        BOOST_TEST( X::instances == 1 );
+
+        p2 = std::unique_ptr<X>( new X );
+        BOOST_TEST( X::instances == 1 );
+
+        p2.reset();
+        BOOST_TEST( X::instances == 0 );
+    }
+
+    {
+        BOOST_TEST( X::instances == 0 );
+
+        std::unique_ptr<X> p( new X );
+        BOOST_TEST( X::instances == 1 );
+
+        boost::shared_ptr<void> p2( std::move( p ) );
+        BOOST_TEST( X::instances == 1 );
+        BOOST_TEST( p.get() == 0 );
+
+        p2.reset();
+        BOOST_TEST( X::instances == 0 );
+
+        p2 = std::unique_ptr<X>( new X );
+        BOOST_TEST( X::instances == 1 );
+
+        p2 = std::unique_ptr<X>( new X );
+        BOOST_TEST( X::instances == 1 );
+
         p2.reset();
         BOOST_TEST( X::instances == 0 );
     }
@@ -115,6 +169,9 @@ int main()
         p2 = std::unique_ptr<Y, YD>( new Y, YD() );
         BOOST_TEST( Y::instances == 1 );
 
+        p2 = std::unique_ptr<Y, YD>( new Y, YD() );
+        BOOST_TEST( Y::instances == 1 );
+
         p2.reset();
         BOOST_TEST( Y::instances == 0 );
     }
@@ -137,6 +194,9 @@ int main()
         p2 = std::unique_ptr<Y, YD&>( new Y, yd );
         BOOST_TEST( Y::instances == 1 );
 
+        p2 = std::unique_ptr<Y, YD&>( new Y, yd );
+        BOOST_TEST( Y::instances == 1 );
+
         p2.reset();
         BOOST_TEST( Y::instances == 0 );
     }
@@ -159,6 +219,9 @@ int main()
         p2 = std::unique_ptr<Y, YD const&>( new Y, yd );
         BOOST_TEST( Y::instances == 1 );
 
+        p2 = std::unique_ptr<Y, YD const&>( new Y, yd );
+        BOOST_TEST( Y::instances == 1 );
+
         p2.reset();
         BOOST_TEST( Y::instances == 0 );
     }