在构建器方法上创建了一个DTO（假设它只有一个带有随机值的“name”属性），我想检查返回的对象是否具有相同的值，但响应为空。
单元测试代码：

class GetProductByIdRouteBuilderTest extends CamelTestSupport {

  @Test
  void testRoute() throws Exception {
    var expected = DTOBuilder.getProductDetailsDTO();

    getMockEndpoint("mock:result").expectedMessageCount(1);
    getMockEndpoint("mock:result").expectedHeaderReceived("id", 1);

    var response = template.requestBodyAndHeader(
            "direct:getProductById",
            null,
            "id",
            1L,
            GetProductDetailsDTO.class
    );

    assertMockEndpointsSatisfied();
    assertEquals(expected.getName(), response.getName());
  }

  @Override
  protected RoutesBuilder createRouteBuilder() {
    return new RouteBuilder() {
      @Override
      public void configure() {
        from("direct:getProductById")
            .routeId("getProductById")
            .log("id = ${header.id}")
            .to("mock:result")
        .end();
      }
    };
  }
}

解决方案

已使用whenAnyExchangeReceived方法：

getMockEndpoint("mock:result").whenAnyExchangeReceived(exchange -> {
    exchange.getMessage().setBody(expected);
    exchange.getMessage().setHeader(Exchange.HTTP_RESPONSE_CODE, HttpStatus.OK.value());
});