rust test std out

To test the standard output (stdout) in Rust, you can use the std::io::stdout module from the standard library. Here's an example of how to do it:

use std::io::{self, Write};

fn main() {
    let message = "Hello, world!";

    // Get a mutable handle to the stdout
    let stdout = io::stdout();
    let mut handle = stdout.lock();

    // Write the message to stdout
    handle.write_all(message.as_bytes()).unwrap();
}

In this example, we import the io module from the std crate, specifically the Write trait and the stdout function. We then define a main function where we store the message to be printed in a variable called message.

Next, we obtain a mutable handle to the stdout by calling stdout.lock(), which returns a StdoutLock object. We can then use the write_all method from the Write trait to write the message to stdout. The as_bytes method is used to convert the message string into a byte slice.

To run this code and see the output, you can use the cargo run command in your terminal. The message "Hello, world!" will be printed to the console.

This is a basic example of how to test the standard output in Rust. There are other ways to accomplish this as well, depending on your specific requirements.