diff --git a/test/ip_ostream_test.cpp b/test/ip_ostream_test.cpp
index 5f38ad3..683911c 100644
--- a/test/ip_ostream_test.cpp
+++ b/test/ip_ostream_test.cpp
@@ -54,6 +54,13 @@ template<class T> std::string to_string( T const& t )
     return os.str();
 }
 
+template<class T> std::wstring to_wstring( T const& t )
+{
+    std::wostringstream os;
+    os << t;
+    return os.str();
+}
+
 int main()
 {
     boost::intrusive_ptr<X> p1, p2( new X );
@@ -61,5 +68,8 @@ int main()
     BOOST_TEST_EQ( to_string( p1 ), to_string( p1.get() ) );
     BOOST_TEST_EQ( to_string( p2 ), to_string( p2.get() ) );
 
+    BOOST_TEST( to_wstring( p1 ) == to_wstring( p1.get() ) );
+    BOOST_TEST( to_wstring( p2 ) == to_wstring( p2.get() ) );
+
     return boost::report_errors();
 }
diff --git a/test/lsp_ostream_test.cpp b/test/lsp_ostream_test.cpp
index 8365988..5eee565 100644
--- a/test/lsp_ostream_test.cpp
+++ b/test/lsp_ostream_test.cpp
@@ -13,6 +13,13 @@ template<class T> std::string to_string( T const& t )
     return os.str();
 }
 
+template<class T> std::wstring to_wstring( T const& t )
+{
+    std::wostringstream os;
+    os << t;
+    return os.str();
+}
+
 int main()
 {
     boost::local_shared_ptr<int> p1, p2( new int );
@@ -20,5 +27,8 @@ int main()
     BOOST_TEST_EQ( to_string( p1 ), to_string( p1.get() ) );
     BOOST_TEST_EQ( to_string( p2 ), to_string( p2.get() ) );
 
+    BOOST_TEST( to_wstring( p1 ) == to_wstring( p1.get() ) );
+    BOOST_TEST( to_wstring( p2 ) == to_wstring( p2.get() ) );
+
     return boost::report_errors();
 }
diff --git a/test/sp_ostream_test.cpp b/test/sp_ostream_test.cpp
index 3d2092a..f212c99 100644
--- a/test/sp_ostream_test.cpp
+++ b/test/sp_ostream_test.cpp
@@ -13,6 +13,13 @@ template<class T> std::string to_string( T const& t )
     return os.str();
 }
 
+template<class T> std::wstring to_wstring( T const& t )
+{
+    std::wostringstream os;
+    os << t;
+    return os.str();
+}
+
 int main()
 {
     boost::shared_ptr<int> p1, p2( new int );
@@ -20,5 +27,8 @@ int main()
     BOOST_TEST_EQ( to_string( p1 ), to_string( p1.get() ) );
     BOOST_TEST_EQ( to_string( p2 ), to_string( p2.get() ) );
 
+    BOOST_TEST( to_wstring( p1 ) == to_wstring( p1.get() ) );
+    BOOST_TEST( to_wstring( p2 ) == to_wstring( p2.get() ) );
+
     return boost::report_errors();
 }