init-twice-retains-filter.rs

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extern crate env_logger;

extern crate log;

use std::env;

use std::process;

use std::str;

fn main() {

    if env::var("YOU_ARE_TESTING_NOW").is_ok() {

        // Init from the env (which should set the max level to `Debug`)

        env_logger::init();

        assert_eq!(log::LevelFilter::Debug, log::max_level());

        // Init again using a different max level

        // This shouldn't clobber the level that was previously set

        env_logger::Builder::new()

            .parse_filters("info")

            .try_init()

            .unwrap_err();

        assert_eq!(log::LevelFilter::Debug, log::max_level());

        return;

    let exe = env::current_exe().unwrap();

    let out = process::Command::new(exe)

        .env("YOU_ARE_TESTING_NOW", "1")

        .env("RUST_LOG", "debug")

        .output()

        .unwrap_or_else(|e| panic!("Unable to start child process: {}", e));

    if out.status.success() {

        return;

    println!("test failed: {}", out.status);

    println!("--- stdout\n{}", str::from_utf8(&out.stdout).unwrap());

    println!("--- stderr\n{}", str::from_utf8(&out.stderr).unwrap());

    process::exit(1);