Mockito 缺少方法调用异常

Question

我知道有很多与我的问题类似的问题/答案，但我仍然无法通过测试解决这个问题。

问题： 我试图模拟 Settings 类，但 Mockito 抱怨这一行：

when(settings.settingsBuilder().put(new String("test"), "test").build()).thenReturn(settings)

任务方法调用异常：

org.mockito.exceptions.misusing.MissingMethodInvocationException: 
when() requires an argument which has to be 'a method call on a mock'.
For example:
 when(mock.getArticles()).thenReturn(articles);

Also, this error might show up because:
1. you stub either of: final/private/equals()/hashCode() methods.
 Those methods *cannot* be stubbed/verified.
 Mocking methods declared on non-public parent classes is not supported.
2. inside when() you don't call method on mock but on some other object.

我尝试了多种可能的方法，但没有结果。下面是实际测试方法。

@RunWith(PowerMockRunner.class)
@PrepareForTest({Settings.class, Client.class})
public class AddressMatcherElasticTest {

private final AddressWebConfiguration configuration = mock(AddressWebConfiguration.class);
private final Settings settings = mock(Settings.class);
private final Client client = mock(Client.class);

  @Test
  public void match() throws Exception {
   when(configuration.getClusterName()).thenReturn(new String("name"));
   when(settings.settingsBuilder().put(new String("name"), "test").build()).thenReturn(settings);
   AddressMatcherElastic test = new AddressMatcherElastic(configuration);
   verify(configuration, times(1)).getClusterName();
 }
}

Answer 1

settings是你的模拟，你可以告诉 Mockito 如果你调用它要返回什么。

settings.settingsBuilder()然而，它不会返回模拟，这就是 Mockito 所抱怨的。您可以settingsBuilder告诉 Mockito 在调用时返回一个模拟对象，例如

Builder settingsBuilder = mock(Builder.class);
when(settingsBuilder.doX()).thenReturn(...);
when(settings.settingsBuilder()).thenReturn(settingsBuilder);

如果您没有另外声明，您的模拟将默认为对象引用返回 null，请注意。