add testing for comment functionality

test.cpp

@@ -58,6 +58,28 @@ int main(int argc, char **argv) {
         std::cout << "    - " << k.dump() << "\n";
     }
 
+#ifdef JSON11_COMMENTS
+    const string comment_test = R"({
+      // comment
+      "a": 1,
+      // comment
+      // continued
+      "b": "text",
+      /* multi
+         line
+         comment */
+      "c": [1, 2, 3]
+    })";
+
+    string err_comment;
+    auto json_comment = Json::parse(comment_test, err_comment);
+    if (!err_comment.empty()) {
+        printf("Failed: %s\n", err_comment.c_str());
+    } else {
+        printf("Result: %s\n", json_comment.dump().c_str());
+    }
+#endif
+
     std::list<int> l1 { 1, 2, 3 };
     std::vector<int> l2 { 1, 2, 3 };
     std::set<int> l3 { 1, 2, 3 };