servo/tests/unit/style/attr.rs

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at https://mozilla.org/MPL/2.0/. */

use app_units::Au;
use style::attr::{AttrValue, LengthOrPercentageOrAuto, parse_length};

#[test]
fn test_parse_double() {
    let value = String::from("432.5e2");
    match AttrValue::from_double(value, 0.0) {
        AttrValue::Double(_, num) => assert_eq!(num, 43250f64),
        _ => panic!("expected a double value"),
    }
}

#[test]
fn test_parse_double_negative_prefix() {
    let value = String::from("-5.6");
    match AttrValue::from_double(value, 0.0) {
        AttrValue::Double(_, num) => assert_eq!(num, -5.6f64),
        _ => panic!("expected a double value"),
    }
}

#[test]
fn test_parse_double_positive_prefix() {
    let value = String::from("+5.6");
    match AttrValue::from_double(value, 0.0) {
        AttrValue::Double(_, num) => assert_eq!(num, 5.6f64),
        _ => panic!("expected a double value"),
    }
}

#[test]
fn test_from_limited_i32_should_be_default_when_less_than_0() {
    let value = String::from("-1");
    match AttrValue::from_limited_i32(value, 0) {
        AttrValue::Int(_, 0) => (),
        _ => panic!("expected an IndexSize error"),
    }
}

#[test]
fn test_from_limited_i32_should_parse_a_uint_when_value_is_0_or_greater() {
    match AttrValue::from_limited_i32(String::from("1"), 0) {
        AttrValue::Int(_, 1) => (),
        _ => panic!("expected an successful parsing"),
    }
}

#[test]
fn test_from_limited_i32_should_keep_parsed_value_when_not_an_int() {
    match AttrValue::from_limited_i32(String::from("parsed-value"), 0) {
        AttrValue::Int(p, 0) => assert_eq!(p, String::from("parsed-value")),
        _ => panic!("expected an successful parsing"),
    }
}

#[test]
pub fn test_parse_length() {
    fn check(input: &str, expected: LengthOrPercentageOrAuto) {
        let parsed = parse_length(input);
        assert_eq!(parsed, expected);
    }

    check("0", LengthOrPercentageOrAuto::Length(Au::from_px(0)));
    check("0.000%", LengthOrPercentageOrAuto::Percentage(0.0));
    check("+5.82%", LengthOrPercentageOrAuto::Auto);
    check("5.82%", LengthOrPercentageOrAuto::Percentage(0.0582));
    check(
        "5.82",
        LengthOrPercentageOrAuto::Length(Au::from_f64_px(5.82)),
    );
    check("invalid", LengthOrPercentageOrAuto::Auto);
    check(
        "12 followed by invalid",
        LengthOrPercentageOrAuto::Length(Au::from_px(12)),
    );
}