import { MOCK_HANDLER_KEY } from '../../utils/constants/symbol-keys.constant';
import type { UsecaseHandler } from '../types/usecase-handler.type';
import type { AnyUsecase } from '../types/utility.type';

/**
 * Replaces a use case's handler with a mock
 * for testing purposes
 *
 * @param usecase The use case to mock
 * @param handler The mock handler function
 * @returns The use case with mocked handler
 */
export function mockUsecaseHandler<Usecase extends AnyUsecase>(
   usecase: Usecase,
   handler: UsecaseHandler<Usecase>,
): Usecase {
   usecase[MOCK_HANDLER_KEY] = handler;
   return usecase;
}