Add test case annotation

Author: rvermeulen

cpp/autosar/test/rules/A15-4-4/test.cpp

@@ -45,10 +45,12 @@ void test_swap_wrapper() noexcept {
   swap_wrapper(&a, &b);
 }
 
-#include <string>
 #include <stdexcept>
+#include <string>
 
-std::string test_fp_reported_in_424(const std::string &s1, const std::string &s2) {
+std::string test_fp_reported_in_424(
+    const std::string &s1,
+    const std::string &s2) { // COMPLIANT - `reserve` and `append` may throw.
   std::string s3;
   s3.reserve(s1.size() + s2.size());
   s3.append(s1.c_str(), s1.size());