diff --git a/test/mem_fun_cxx98.cpp b/test/mem_fun_cxx98.cpp
index afded46..fba21dd 100644
--- a/test/mem_fun_cxx98.cpp
+++ b/test/mem_fun_cxx98.cpp
@@ -10,22 +10,28 @@
 
     
 #include <boost/function.hpp>
+#include <boost/detail/lightweight_test.hpp>
 #include <iostream>
 #include <functional>
 
 struct X {
   int foo(int);
+  std::ostream& foo2(std::ostream&) const;
 };
 int X::foo(int x) { return -x; }
+std::ostream& X::foo2(std::ostream& x) const { return x; }
 
 int main()
 {
     boost::function<int (X*, int)> f;
+    boost::function<std::ostream& (X*, std::ostream&)> f2;
 
-f = &X::foo;
-  
-X x;
-f(&x, 5);
+    f = &X::foo;
+    f2 = &X::foo2;
 
-    return 0;
+    X x;
+    BOOST_TEST(f(&x, 5) == -5);
+    BOOST_TEST(f2(&x, boost::ref(std::cout)) == std::cout);
+
+    return ::boost::report_errors();
 }
diff --git a/test/mem_fun_portable.cpp b/test/mem_fun_portable.cpp
index 689eb22..b0dcd14 100644
--- a/test/mem_fun_portable.cpp
+++ b/test/mem_fun_portable.cpp
@@ -10,22 +10,28 @@
 
     
 #include <boost/function.hpp>
+#include <boost/detail/lightweight_test.hpp>
 #include <iostream>
 #include <functional>
 
 struct X {
   int foo(int);
+  std::ostream& foo2(std::ostream&) const;
 };
 int X::foo(int x) { return -x; }
+std::ostream& X::foo2(std::ostream& x) const { return x; }
 
 int main()
 {
     boost::function2<int, X*, int> f;
+    boost::function2<std::ostream&, X*, std::ostream&> f2;
 
-f = &X::foo;
-  
-X x;
-f(&x, 5);
+    f = &X::foo;
+    f2 = &X::foo2;
 
-    return 0;
+    X x;
+    BOOST_TEST(f(&x, 5) == -5);
+    BOOST_TEST(f2(&x, boost::ref(std::cout)) == std::cout);
+
+    return ::boost::report_errors();
 }