Mockito 无缘无故抛出 UnfinishedStubbingException

Question

我正在尝试编写一个“简单”的单元测试。然而，Mockito 总是告诉我有一个 UnfinishedStubbingException.

Mockito 暴露为罪魁祸首的代码行如下：

when(myServiceIdFactory.get(any())).thenReturn((SortedSet<MyServiceId>) Set.of(emptyId));

这是整个单元测试代码

@SpringBootTest
@RunWith(SpringRunner.class)
public class MyServiceIdProcessorTest {

  @Autowired
  private MyServiceIdProcessor myServiceIdProcessor;
  @MockBean
  private MyServiceIdFactory myServiceIdFactory;

  @Test
  public void shouldFilterProductsWithNoId() {
    Product productWithNoId = new Product();
    MyServiceId emptyId = new MyServiceId();
    when(myServiceIdFactory.get(any())).thenReturn((SortedSet<MyServiceId>) Set.of(emptyId));

    CatalogDTO catalogDTO = new CatalogDTO();
    Envelope<CatalogDTO, Product> envelopeToTest = Envelope.products(List.of(productWithNoId));

    Envelope returnedEnvelope = myServiceIdProcessor.enrichCatalog(envelopeToTest);

    assertThat(returnedEnvelope.getProducts()).hasSize(0);
  }
}

Answer 1

在定义 bahavoir

之前尝试 spy() MyServiceIdFactory

  @Test
  public void shouldFilterProductsWithNoId() {
    // Arrange
    Product productWithNoId = new Product();
    MyServiceId emptyId = new MyServiceId();
    MyServiceIdFactory spyMyServiceIdFactory = spy(myServiceIdFactory);
    SortedSet<MyServiceId> set = (SortedSet<MyServiceId>) Set.of(emptyId);
    doReturn(set).when(spyMyServiceIdFactory).get(any());

    CatalogDTO catalogDTO = new CatalogDTO();
    Envelope<CatalogDTO, Product> envelopeToTest = Envelope.products(List.of(productWithNoId));

    // Act
    Envelope returnedEnvelope = spyMyServiceIdFactory.enrichCatalog(envelopeToTest);

    // Assert
    assertThat(returnedEnvelope.getProducts()).hasSize(0);
  }

Answer 2

问题是以下转换异常：

 when(myServiceIdFactory.get(any())).thenReturn((SortedSet<MyServiceId>) Set.of(emptyId));

Set.of(foo) 无法转换为 SortedSet。然而，异常似乎被 Mockito

吞没并覆盖

Mockito 无缘无故抛出 UnfinishedStubbingException

Mockito throws UnfinishedStubbingException for no apparent reason

java

unit-testing

mockito