Function fileNameTag

tests/catch.hpp:13738–13745

        }

        std::string fileNameTag(const std::vector<std::string> &tags) {
            auto it = std::find_if(begin(tags),
                                   end(tags),
                                   [] (std::string const& tag) {return tag.front() == '#'; });
            if (it != tags.end())
                return it->substr(1);
            return std::string();
        }
    } // anonymous namespace

    JunitReporter::JunitReporter( ReporterConfig const& _config )