assertThat(timer.elapsed(MILLISECONDS)).isAtLeast(10L);
    // wait for interrupted status and clear it
    while (!Thread.interrupted()) {
      Thread.yield();
    }
  }

  private static class Producer implements Callable<@Nullable Void> {
    final BlockingQueue<Object> q;
    final int elements;
    final CountDownLatch beganProducing = new CountDownLatch(1);

        // maxParameterCount should be 0
        // maxDataCount should be 800
        // maxSetupCount should be 0
        assertNotNull(trans2QueryFSInfo);

        // Since these are protected fields, we can't access them directly
        // But we can verify the object is created successfully with these values
    }

    @Test
    @DisplayName("Test information level mapping edge cases")

        // These values are set in the constructor
        // maxParameterCount should be 6
        // maxDataCount should be 0
        // maxSetupCount should be 0

        // Since these are protected fields, we can't access them directly
        // But we can verify the object is created successfully with these values
        assertNotNull(trans2SetFileInfo);
    }

    @Test
    @DisplayName("Test concurrent access")

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/// tip

Pydantic 是 FastAPI 中所有数据验证和序列化的核心，当你在没有设默认值的情况下使用 `Optional` 或 `Union[Something, None]` 时，它具有特殊行为，你可以在 Pydantic 文档中阅读有关<a href="https://docs.pydantic.dev/latest/concepts/models/#required-optional-fields" class="external-link" target="_blank">必需可选字段</a>的更多信息。

///

## 查询参数列表 / 多个值

当你使用 `Query` 显式地定义查询参数时，你还可以声明它去接收一组值，或换句话来说，接收多个值。

例如，要声明一个可在 URL 中出现多次的查询参数 `q`，你可以这样写：