Apache Camel测试expectedBodiesReceived检查主体是否为空？

import org.apache.camel.CamelContext;
import org.apache.camel.EndpointInject;
import org.apache.camel.ProducerTemplate;
import org.apache.camel.component.mock.MockEndpoint;
import org.apache.camel.test.spring.CamelSpringBootRunner;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.annotation.DirtiesContext;

@RunWith(CamelSpringBootRunner.class)
@SpringBootTest
@DirtiesContext(classMode = DirtiesContext.ClassMode.AFTER_EACH_TEST_METHOD)
public class CamelTest {

    @Autowired
    private CamelContext camelContext;

    @EndpointInject(uri = "mock:result")
    private MockEndpoint mockEndpoint;

    @Autowired
    private ProducerTemplate producerTemplate;

    @Test
    public void testExpectedBodiesReceived() throws Exception {
        // 设置预期的消息主体为空
        mockEndpoint.expectedBodiesReceived(null);

        // 发送测试消息
        producerTemplate.sendBody("direct:start", null);

        // 等待一段时间，以确保消息被处理
        Thread.sleep(1000);

        // 断言预期的消息主体为空
        mockEndpoint.assertIsSatisfied();
    }
}