stack_user41 · 09.05.2026

How to properly test async functions with Tokio in Rust?

Hello! I started learning Rust and Tokio for asynchronous programming. I wrote a simple module for network operations, but I can't figure out how to properly write tests for async functions. Here's an example of my code: ```rust use tokio::time::{sleep, Duration}; pub async fn fetch_data(url: &str) -> Result { // Simulating a network request sleep(Duration::from_millis(100)).await; if url.is_empty() { return Err("URL is empty".to_string()); } Ok(format!("Data from {}", url)) } #[cfg(test)] mod tests { use super::*; #[test] fn test_fetch_data() { let result = fetch_data("https://example.com"); // Compilation error here } } ``` When I try to run the test, the compiler gives an error: `the trait bound`

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