autostore/nestjs/src/application/commands/__tests__/add-item.command.spec.ts

import { AddItemCommand } from '../add-item.command';
import { ItemEntity } from '../../../domain/entities/item.entity';

// Mock implementations
const mockItemRepository = {
  save: jest.fn(),
};

const mockOrderService = {
  orderItem: jest.fn(),
};

const mockTimeProvider = {
  now: jest.fn(),
};

const mockExpirationSpec = {
  isExpired: jest.fn(),
};

const mockLogger = {
  log: jest.fn(),
  error: jest.fn(),
  warn: jest.fn(),
  debug: jest.fn(),
};

describe('AddItemCommand', () => {
  let addItemCommand: AddItemCommand;

  const MOCKED_NOW = '2023-01-01T12:00:00Z';
  const NOT_EXPIRED_DATE = '2023-01-02T12:00:00Z';
  const EXPIRED_DATE = '2022-12-31T12:00:00Z';
  const ITEM_NAME = 'Test Item';
  const ORDER_URL = 'https://example.com/order';
  const USER_ID = '550e8400-e29b-41d4-a716-446655440001';

  beforeEach(() => {
    jest.clearAllMocks();

    addItemCommand = new AddItemCommand(
      mockItemRepository as any,
      mockOrderService as any,
      mockTimeProvider as any,
      mockLogger as any,
      mockExpirationSpec as any,
    );

    mockTimeProvider.now.mockReturnValue(new Date(MOCKED_NOW));
  });

  describe('execute', () => {
    describe('when item is not expired', () => {
      beforeEach(() => {
        mockExpirationSpec.isExpired.mockReturnValue(false);
      });

      it('should save item to repository', async () => {
        await addItemCommand.execute(ITEM_NAME, NOT_EXPIRED_DATE, ORDER_URL, USER_ID);

        expect(mockItemRepository.save).toHaveBeenCalledTimes(1);
        expect(mockItemRepository.save).toHaveBeenCalledWith(expect.any(ItemEntity));
      });

      it('should not call order service', async () => {
        await addItemCommand.execute(ITEM_NAME, NOT_EXPIRED_DATE, ORDER_URL, USER_ID);

        expect(mockOrderService.orderItem).not.toHaveBeenCalled();
      });

      it('should return item ID', async () => {
        const result = await addItemCommand.execute(ITEM_NAME, NOT_EXPIRED_DATE, ORDER_URL, USER_ID);

        expect(result).toBeTruthy();
        expect(typeof result).toBe('string');
        expect(result).toMatch(/^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i);
      });

      it('should validate expiration with ItemExpirationSpec', async () => {
        await addItemCommand.execute(ITEM_NAME, NOT_EXPIRED_DATE, ORDER_URL, USER_ID);

        expect(mockExpirationSpec.isExpired).toHaveBeenCalledTimes(1);
        expect(mockExpirationSpec.isExpired).toHaveBeenCalledWith(
          expect.any(ItemEntity),
          new Date(MOCKED_NOW)
        );
      });
    });

    describe('when item is expired', () => {
      beforeEach(() => {
        mockExpirationSpec.isExpired.mockReturnValue(true);
      });

      it('should call order service', async () => {
        await addItemCommand.execute(ITEM_NAME, EXPIRED_DATE, ORDER_URL, USER_ID);

        expect(mockOrderService.orderItem).toHaveBeenCalledTimes(1);
        expect(mockOrderService.orderItem).toHaveBeenCalledWith(expect.any(ItemEntity));
      });

      it('should not save item to repository', async () => {
        await addItemCommand.execute(ITEM_NAME, EXPIRED_DATE, ORDER_URL, USER_ID);

        expect(mockItemRepository.save).not.toHaveBeenCalled();
      });

      it('should return item ID', async () => {
        const result = await addItemCommand.execute(ITEM_NAME, EXPIRED_DATE, ORDER_URL, USER_ID);

        expect(result).toBeTruthy();
        expect(typeof result).toBe('string');
      });

      it('should handle order service failure gracefully', async () => {
        mockOrderService.orderItem.mockRejectedValue(new Error('Order service failed'));

        const result = await addItemCommand.execute(ITEM_NAME, EXPIRED_DATE, ORDER_URL, USER_ID);

        expect(result).toBeTruthy();
        expect(typeof result).toBe('string');
        expect(result).toMatch(/^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i);
        expect(mockOrderService.orderItem).toHaveBeenCalledTimes(1);
        expect(mockItemRepository.save).not.toHaveBeenCalled();
      });
    });

    describe('input validation', () => {
      it('should throw error when name is empty', async () => {
        await expect(
          addItemCommand.execute('', NOT_EXPIRED_DATE, ORDER_URL, USER_ID)
        ).rejects.toThrow('Item name cannot be empty');
      });

      it('should throw error when name is only whitespace', async () => {
        await expect(
          addItemCommand.execute('   ', NOT_EXPIRED_DATE, ORDER_URL, USER_ID)
        ).rejects.toThrow('Item name cannot be empty');
      });

      it('should throw error when expirationDate is empty', async () => {
        await expect(
          addItemCommand.execute(ITEM_NAME, '', ORDER_URL, USER_ID)
        ).rejects.toThrow('Expiration date cannot be empty');
      });

      it('should throw error when expirationDate is only whitespace', async () => {
        await expect(
          addItemCommand.execute(ITEM_NAME, '   ', ORDER_URL, USER_ID)
        ).rejects.toThrow('Expiration date cannot be empty');
      });

      it('should throw error when orderUrl is empty', async () => {
        await expect(
          addItemCommand.execute(ITEM_NAME, NOT_EXPIRED_DATE, '', USER_ID)
        ).rejects.toThrow('Order URL cannot be empty');
      });

      it('should throw error when orderUrl is only whitespace', async () => {
        await expect(
          addItemCommand.execute(ITEM_NAME, NOT_EXPIRED_DATE, '   ', USER_ID)
        ).rejects.toThrow('Order URL cannot be empty');
      });

      it('should throw error when userId is empty', async () => {
        await expect(
          addItemCommand.execute(ITEM_NAME, NOT_EXPIRED_DATE, ORDER_URL, '')
        ).rejects.toThrow('User ID cannot be empty');
      });

      it('should throw error when userId is only whitespace', async () => {
        await expect(
          addItemCommand.execute(ITEM_NAME, NOT_EXPIRED_DATE, ORDER_URL, '   ')
        ).rejects.toThrow('User ID cannot be empty');
      });
    });
  });
});