Method test_case_exception

test/doctest.h:5908–5911

        }

        void test_case_exception(const TestCaseException& e) override {
            DOCTEST_LOCK_MUTEX(mutex)
            testCaseData.addError("exception", e.error_string.c_str());
        }

        void subcase_start(const SubcaseSignature& in) override {
            deepestSubcaseStackNames.push_back(in.m_name);