Function require_throws

tests/unittests/test_subtitle_formatter.cpp:22–30

}

void require_throws(const std::function<void()> & fn, const std::string & label) {
    bool threw = false;
    try {
        fn();
    } catch (const std::runtime_error &) {
        threw = true;
    }
    engine::test::require(threw, label + " did not throw");
}

void test_formats_srt_timecodes_and_text() {
    engine::text::SubtitleFormatOptions options;