Method subString

unittests/catch.hpp:10505–10505

        m_escapeChars.push_back( m_pos );
    }
    std::string TestSpecParser::subString() const { return m_arg.substr( m_start, m_pos - m_start ); }

    void TestSpecParser::addFilter() {
        if( !m_currentFilter.m_patterns.empty() ) {