Java – analog type conversion object

I have a simple method in the bean to handle cell editing events in the primefaces data table The method is as follows:

public void onCellEdit(CellEditEvent event) {
    Object oldValue = event.getOldValue();
    Object newValue = event.getNewValue();

    User user = (User) ((DataTable) event.getComponent()).getRowData();
    if (!newValue.equals(oldValue))
    user.setUsername(oldValue.toString());
                     ....
}

How can I imitate: user = (user) ((datatable) event getComponent()). getRowData();

Solution

CellEditEvent mockEvent = Mockito.mock(CellEditEvent.class);

CellEditEvent mockEvent = Mockito.mock(CellEditEvent.class);
DataTable mockDataTable = Mockito.mock(DataTable.class);

Mockito.when(mockEvent.getComponent()).thenReturn(mockDataTable);
Mockito.when(mockDataTable.getRowData()).thenReturn(userObj);