compiles again

unittests/mocks/DeviceHandlerMock.cpp

@@ -108,3 +108,14 @@ ReturnValue_t DeviceHandlerMock::initialize() {
   setMode(MODE_ON);
   return result;
 }
+
+ReturnValue_t DeviceHandlerMock::serializeDataset(sid_t structureId, uint8_t *buf, size_t maxSize) {
+  return returnvalue::OK;
+}
+
+ReturnValue_t DeviceHandlerMock::specifyDatasets(
+    std::vector<periodicHk::SetSpecification> &setList) {
+  return returnvalue::OK;
+}
+
+localpool::SharedPool *DeviceHandlerMock::getOptionalSharedPool() { return nullptr; }