rust-clippy/tests/check-fmt.rs

#![warn(rust_2018_idioms, unused_lifetimes)]

use std::path::PathBuf;
use std::process::Command;

#[test]
fn fmt() {
    if option_env!("RUSTC_TEST_SUITE").is_some() || option_env!("NO_FMT_TEST").is_some() {
        return;
    }

    let root_dir = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
    let output = Command::new("cargo")
        .current_dir(root_dir)
        .args(["dev", "fmt", "--check"])
        .output()
        .unwrap();

    println!("status: {}", output.status);
    println!("stdout: {}", String::from_utf8_lossy(&output.stdout));
    println!("stderr: {}", String::from_utf8_lossy(&output.stderr));

    assert!(
        output.status.success(),
        "Formatting check failed. Run `cargo dev fmt` to update formatting."
    );
}