urlogger 1.1.2

Lightweight colored logger: `log(level, message)` with `RUST_LOG` filtering.
Documentation 
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//! Public types for urlogger.

/// Log level. Order: Error > Warn > Info > Debug > Trace.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, PartialOrd, Ord)]
pub enum LogLevel {
    Error,
    Warn,
    Info,
    Debug,
    Trace,
}

impl LogLevel {
    /// Level name as lowercase (e.g. for `RUST_LOG`).
    #[inline]
    pub fn as_str(self) -> &'static str {
        match self {
            LogLevel::Error => "error",
            LogLevel::Warn => "warn",
            LogLevel::Info => "info",
            LogLevel::Debug => "debug",
            LogLevel::Trace => "trace",
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn as_str_returns_lowercase_names() {
        assert_eq!(LogLevel::Error.as_str(), "error");
        assert_eq!(LogLevel::Warn.as_str(), "warn");
        assert_eq!(LogLevel::Info.as_str(), "info");
        assert_eq!(LogLevel::Debug.as_str(), "debug");
        assert_eq!(LogLevel::Trace.as_str(), "trace");
    }

    #[test]
    fn ordering_error_most_severe_trace_least() {
        use std::cmp::Ordering;
        assert!(LogLevel::Error < LogLevel::Warn);
        assert!(LogLevel::Warn < LogLevel::Info);
        assert!(LogLevel::Info < LogLevel::Debug);
        assert!(LogLevel::Debug < LogLevel::Trace);
        assert_eq!(LogLevel::Error.cmp(&LogLevel::Error), Ordering::Equal);
    }
}