...

test/test_seller.cpp

@@ -2,7 +2,9 @@
 
 #define BOOST_TEST_MODULE seller
 
-#include <boost/test/unit_test.hpp>
+#include <boost/test/included/unit_test.hpp>
+
+using namespace boost::unit_test;
 
 BOOST_AUTO_TEST_CASE( initial_test ) {
     Seller seller{};