Hi, I'm having a bit of trouble getting user-defined objects working with Boost.Test. I skimmed through the docs and I didn't see anything on this subject, but the boost documentation isn't the most intuitive documentation, so it is a bit easy to miss obvious stuff like this. Anyway, I have a class named "Foo", and I've given it an overloaded boolean == operator. When I do the following, it fails to compile under MSVC9: Foo a, b; BOOST_TEST_EQUAL( a, b ); The class is defined as follows: class Foo { private: std::string data; public: Foo() : data( "Testing 123" ) {} Foo( Foo const& other ) { data = other.data; } bool operator== ( Foo const& operand ) { return data == operand.data; } }; Below is the error I'm getting. How can I make this work? I've truncated it a little bit since it's insanely long: 1>c:\it\tfs\crusades\sdks\boost\boost\test\test_tools.hpp(342) : error C2679: binary '<<' : no operator found which takes a right-hand operand of type 'const Foo' (or there is no acceptable conversion) 1> c:\program files\microsoft visual studio 9.0\vc\include\ostream(653): could be 'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const char *)' [found using argument-dependent lookup] 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ] 1> c:\program files\microsoft visual studio 9.0\vc\include\ostream(700): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,char)' [found using argument-dependent lookup] 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ] 1> c:\program files\microsoft visual studio 9.0\vc\include\ostream(738): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const char *)' [found using argument-dependent lookup] 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ]