in boost/teamcity_boost.cpp [179:187]
void TeamcityBoostLogFormatter::log_entry_start(std::ostream & out, boost::unit_test::log_entry_data const & entry_data, log_entry_types /*let*/)
{
std::stringstream ss(std::ios_base::out);
out << entry_data.m_file_name << "(" << entry_data.m_line_num << "): ";
ss << entry_data.m_file_name << "(" << entry_data.m_line_num << "): ";
currentDetails += ss.str();
}