jwt_object API fixes

include/jwt/test/test_jwt_object.cc

@@ -1,4 +1,7 @@
 #include <iostream>
+#include <map>
+#include <string>
+#include <unordered_map>
 #include "jwt/jwt.hpp"
 
 void basic_jwt_object_test()
@@ -8,6 +11,27 @@ void basic_jwt_object_test()
                                 {"a", "b"},
                                 {"c", "d"} 
                               }));
+  //check with std::map
+  std::map<std::string, std::string> m;
+  m["a"] = "b";
+  m["c"] = "d";
+
+  jwt::jwt_object obj1{payload(m)};
+  auto obj2 = std::move(obj1);
+
+  std::cout << obj2.payload() << std::endl;
+
+  //check with unordered map of string_view
+  std::unordered_map<jwt::string_view, std::string> um = {
+    {"a", "b"},
+    {"c", "d"}
+  };
+  jwt::jwt_object obj3{payload(um)};
+
+  obj3.add_claim("f", true)
+      .add_claim("time", 176353563);
+
+  std::cout << jwt::to_json_str(obj3.payload(), true) << std::endl;
 }
 
 int main() {