File filterService.groupByUserField.test.ts

tests/unit/services/filterService.groupByUserField.test.ts:None–None

import { FilterService } from '../../../src/services/FilterService';
import { TaskManager } from '../../../src/utils/TaskManager';
import { StatusManager } from '../../../src/services/StatusManager';
import { PriorityManager } from '../../../src/services/PriorityManager';