Method addFailure

test/doctest.h:5802–5805

            }

            void addFailure(const std::string& message, const std::string& type, const std::string& details) {
                testcases.back().failures.emplace_back(message, type, details);
                ++totalFailures;
            }

            void addError(const std::string& message, const std::string& details) {
                testcases.back().errors.emplace_back(message, details);