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rust - 如何在 rust 中测试异步函数？

问题描述

我有一个需要测试的异步函数。这个函数使用一个mongodb::Database对象来运行。所以我在setup()函数中初始化了连接，并用它tokio_test::block_on()来包装await里面的表达式。这是我的代码：

#[cfg(test)]
mod tests {

    use mongodb::{options::ClientOptions, Client};
    use tokio_test;

    async fn setup() -> mongodb::Database {
        tokio_test::block_on(async {
            let client_uri = "mongodb://127.0.0.1:27017";
            let options = ClientOptions::parse(&client_uri).await;
            let client_result = Client::with_options(options.unwrap());
            let client = client_result.unwrap();
            client.database("my_database")
        })
    }

    #[test]
    fn test_something_async() { // for some reason, test cannot be async
        let DB = setup(); // <- the DB is impl std::future::Future type

        // the DB variable will be used to run another
        // async function named "some_async_func"
        // but it doesn't work since DB is a Future type 
        // Future type need await keyword
        // but if I use await-async keywords here, it complains
        // error: async functions cannot be used for tests
        // so what to do here ?
        some_async_func(DB);
    }
}

标签： rust

解决方案

只需替换#[test]为#[tokio::test]任何测试功能。如果您使用 actix-web，您可以在测试函数中Cargo.toml和之前添加 actix_rt#[actix_rt::test]

#[tokio::test]
fn test_something_async() { // for some reason, test cannot be async
    let DB = setup(); // <- the DB is impl std::future::Future type

    // the DB variable will be used to run another
    // async function named "some_async_func"
    // but it doesn't work since DB is a Future type 
    // Future type need await keyword
    // but if I use await-async keywords here, it complains
    // error: async functions cannot be used for tests
    // so what to do here ?
    some_async_func(DB);
}

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