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test(css): cover Color 5 zero weights and percentage serialization

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Original-commit: 6e9e9a7327
This commit is contained in:
ldm0
2026-10-21 17:55:02 +08:00
committed by Donough Liu
parent 71a0dd38ea
commit da0b0eeae7
1 changed files with 23 additions and 0 deletions
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moli-css-parse/src/color.rs
+23
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@@ -149,6 +149,29 @@ fn absolute_srgb_bytes(color: AbsoluteColor) -> [u8; 4] {
#[cfg(test)]
mod tests {
use super::*;
use style_traits::ToCss;
#[test]
fn color_mix_preserves_zero_weights_and_serializes_omitted_percentages() {
// CSS Color 5 no longer rejects a zero-sum mix. The frozen WPT
// snapshot predates this rule and the percentage serialization update.
for value in [
"color-mix(in srgb, red 0%, blue 0%)",
"color-mix(in srgb, red 0%)",
"color-mix(in srgb, red 0%, green 0%, blue 0%)",
] {
assert!(parse_specified_color(value).is_some(), "{value}");
assert_eq!(parse_css_color_to_srgb_bytes(value).unwrap()[3], 0);
}
assert!(parse_specified_color("color-mix(in srgb, red -1%, blue)").is_none());
assert!(parse_specified_color("color-mix(in srgb, red 101%, blue)").is_none());
assert_eq!(
parse_specified_color("color-mix(contrast-color(blue) 100%, purple)")
.unwrap()
.to_css_string(),
"color-mix(contrast-color(blue) 100%, purple 0%)",
);
}
#[test]
fn css_colors_convert_to_opaque_srgb_hex() {