An example of a test that behaves differently depending on whether it is called directly or indirectly.

direct_test.rs

// I work in VS Code. It has a Run Test button above every test.
// I have a test that renders an HTML page with Handlebars.
// I'd like to open the page in the browser if the test is called directly.
// If the test is called indirectly (but rather as a result of `cargo test`), I don't want the test to open the browser.
// The code below demonstrates how it can be achieved.

#[cfg(test)]
mod tests {
    #[test]
    fn direct_test() {    
        let called_directly = {
            let path = format!("{}::{}", module_path!().split_once("::").map(|(_crate_name, mod_path)| mod_path).unwrap(), stringify!(direct_test));
            std::env::args().any(|arg| arg == path)
        };

        if called_directly {
            println!("Called directly");
        } else {
            println!("Called indirectly");
        }
    }
}