Fix all valgrind leak issues in tests

Signed-off-by: Deukhoofd <deukhoofd@gmail.com>

src/UserData/UserData.hpp

@@ -1,3 +1,5 @@
+#include <utility>
+
 #ifndef PORYGONLANG_USERDATA_HPP
 #define PORYGONLANG_USERDATA_HPP
 
@@ -9,23 +11,30 @@ namespace Porygon::UserData {
     class UserData {
         std::unordered_map<uint32_t, UserDataField *> _fields;
     public:
-        explicit UserData(std::unordered_map<uint32_t, UserDataField *> fields) {
-            _fields = std::move(fields);
+        explicit UserData(std::unordered_map<uint32_t, UserDataField *> fields)
+            : _fields(std::move(fields))
+        {
         }
 
-        bool ContainsField(uint32_t fieldId) {
+        ~UserData(){
+            for (auto f: _fields){
+                delete f.second;
+            }
+        }
+
+        bool ContainsField(uint32_t fieldId) const{
             return _fields.find(fieldId) != _fields.end();
         }
 
-        UserDataField *GetField(uint32_t fieldId) {
-            return _fields[fieldId];
+        UserDataField *GetField(uint32_t fieldId) const {
+            return _fields.at(fieldId);
         }
 
         void CreateField(uint32_t fieldId, UserDataField *field) {
             _fields.insert({fieldId, field});
         }
 
-        int32_t GetFieldCount() {
+        int32_t GetFieldCount() const{
             return _fields.size();
         }
     };