Question

我们正在使用Mockito来模拟对象。如何模拟在服务代码中创建的对象？以下是服务代码和测试代码。有帮助吗？我现在也不想使用Powermock。

public class EventPublisher  {
    public void publishEvent(final String eventJson) {

        try {
            ObjectMapper objectMapper = getObjectMapper(true);
            Test testJson = objectMapper.writeValueAsString(event);
            testJson.getName();
        } catch (JsonProcessingException e) {

            return;
        }
        //publish();  some external call
    }
    private ObjectMapper getObjectMapper(boolean enableRootElement) {
        ObjectMapper objectMapper = new ObjectMapper();
        objectMapper.configure(SerializationFeature.WRAP_ROOT_VALUE, enableRootElement);
        return objectMapper;
    }
}

测试代码：

   public void testPublishEvent() throws Exception {
            ObjectMapper objectMapper = mock(ObjectMapper.class);
                when(objectMapper.writeValueAsString(json))
.thenThrow(mock(JsonProcessingException.class));  //this is not getting invoked


}

Answer 1

感谢您的建议。虽然代码重构是个好主意，但由于该方法在多个地方使用。而不是增加解决方案下面的测试范围来解决当前问题。

public class EventPubliserTest {

@Mock
private ObjectMapper objectMapper;

private class MockEventPublisher extends EventPublisher {
    @Override
    protected ObjectMapper getObjectMapper(boolean flag) {
        return objectMapper;
    }

}

@Test
public void testPublishEvent() throws Exception {
    EventPublisher eventPublisher = new MockEventPublisher();
    when(objectMapper.writeValueAsString(json)).thenThrow(mock(JsonProcessingException.class)); 
    //create or mock some json string
    eventPublisher.publishEvent(json);

    }
}

如何模拟使用新方法创建的对象

1 个答案: