Java mockito单元测试实现过程解析

Z时代
2024-01-10
分类：综合

待测试的服务接口：


public interface ItemService {
  String getItemNameUpperCase(String itemId);
}

预览

待测试的服务的实现类：


@Service
public class ItemServiceImpl implements ItemService {
  @Resource
  private ItemRepository itemRepository;
  @Override
  public String getItemNameUpperCase(String itemId) {
    Item item = itemRepository.findById(itemId);
    if (item == null) {
      return null;
    }
    return item.getName().toUpperCase();
  }
}
// 测试用例
import org.junit.Before;
import org.junit.Test;
import org.mockito.InjectMocks;
import org.mockito.Mock;
import org.mockito.MockitoAnnotations;
import static org.assertj.core.api.Assertions.assertThat;
import static org.mockito.Mockito.*;
public class ItemServiceTest {
  @Mock
  private ItemRepository itemRepository;
  @InjectMocks
  private ItemServiceImpl itemService;
  @Before
  public void setUp(){
    MockitoAnnotations.initMocks(this);
  }
  /**
   * 如果从存储层查询到一个Item, 那么它的 name 将被转化为大写.
   */
  @Test
  public void shouldReturnItemNameInUpperCase() {
    // Given
    Item mockedItem = new Item("it1", "Item 1", "This is item 1", 2000, true);
    when(itemRepository.findById("it1")).thenReturn(mockedItem);
    // When
    String result = itemService.getItemNameUpperCase("it1");
    // Then
    verify(itemRepository, times(1)).findById("it1");
    assertThat(result).isEqualTo("ITEM 1");
  }
}