in boost/teamcity_boost.cpp [199:203]
void TeamcityBoostLogFormatter::entry_context_start(std::ostream &out, boost::unit_test::log_level l) {
const std::string& initial_msg = (l == boost::unit_test::log_successful_tests ? ASSERT_CTX : FAILURE_CTX);
out << initial_msg;
currentContextDetails = initial_msg;
}