In components/script/test.rs

test.rs

    use app_units::Au;
    use style::servo::media_queries::{ExpressionKind, Range};
    use style::media_queries::{MediaQuery, MediaQueryType};
    use style::media_queries::{Expression};
    use style::values::specified::{Length, NoCalcLength, AbsoluteLength};

    pub fn test_media_query(len: i32) -> MediaQuery {
        // try this updated line below, we just imported AbsoluteLength which is an enum and use its Px variant
        let length = Length::NoCalc(NoCalcLength::Absolute(AbsoluteLength::Px(len)));
        let expr = Expression(ExpressionKind::Width(Range::Max(length)));
        let media_query = MediaQuery {
            qualifier: None,
            media_type: MediaQueryType::All,
            expressions: vec![expr]
        };
        media_query
    }