import static org.mockito.Mockito.doThrow;
import static org.mockito.Mockito.mock;
-import com.google.common.base.Optional;
import java.lang.reflect.Field;
+import java.util.Optional;
import org.junit.Test;
import org.opendaylight.mdsal.common.api.ReadFailedException;
import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;