boost_1_45_0/libs/test/doc/src/examples/example28.cpp

#define BOOST_TEST_MODULE example
#include <boost/test/included/unit_test.hpp>
#include <boost/test/output_test_stream.hpp> 
using boost::test_tools::output_test_stream;

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BOOST_AUTO_TEST_CASE( test )
{
    output_test_stream output;
    int i=2;
    output << "i=" << i;
    BOOST_CHECK( !output.is_empty( false ) );
    BOOST_CHECK( output.check_length( 3, false ) );
    BOOST_CHECK( output.is_equal( "i=3" ) );
}

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