rsass 0.29.2

Sass implementation in pure rust (not complete yet)
Documentation 
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//! Tests auto-converted from "sass-spec/spec/css/plain/functions.hrx"

fn runner() -> crate::TestRunner {
    super::runner()
        .with_cwd("functions")
        .mock_file("alpha/plain.css", "a {b: alpha(0.1)}\n")
        .mock_file("defined_elsewhere/plain.css", "c {d: a()}\n")
        .mock_file("empty_fallback_var/plain.css", "a {b: var(--c, )}\n")
        .mock_file(
            "error/empty_fallback_var/empty_second_before_third/plain.css",
            "a {b: var(--c, , d)}\n",
        )
        .mock_file(
            "error/empty_fallback_var/invalid_second_arg_syntax/plain.css",
            "a {b: var(--c, {})}\n",
        )
        .mock_file("grayscale/plain.css", "a {b: grayscale(0.1)}\n")
        .mock_file("hsl/plain.css", "a {b: hsl(0, 100%, 50%)}\n")
        .mock_file("hsla/plain.css", "a {b: hsla(0, 100%, 50%, 0.5)}\n")
        .mock_file("invert/plain.css", "a {b: invert(0.1)}\n")
        .mock_file("rgb/plain.css", "a {b: rgb(10, 20, 30)}\n")
        .mock_file("rgba/plain.css", "a {b: rgba(10, 20, 30, 0.5)}\n")
        .mock_file("saturate/plain.css", "a {b: saturate(0.1)}\n")
}

#[test]
fn alpha() {
    let runner = runner().with_cwd("alpha");
    assert_eq!(
        runner.ok("@use \"plain\";\n"),
        "a {\
         \n  b: alpha(0.1);\
         \n}\n"
    );
}
#[test]
fn defined_elsewhere() {
    let runner = runner().with_cwd("defined_elsewhere");
    assert_eq!(
        runner.ok("@function a() {@return b}\n\
             \n@import \"plain\";\n"),
        "c {\
         \n  d: a();\
         \n}\n"
    );
}
#[test]
fn empty_fallback_var() {
    let runner = runner().with_cwd("empty_fallback_var");
    assert_eq!(
        runner.ok("@use \"plain\";\n"),
        "a {\
         \n  b: var(--c, );\
         \n}\n"
    );
}
mod error {
    fn runner() -> crate::TestRunner {
        super::runner().with_cwd("error")
    }

    mod empty_fallback_var {
        fn runner() -> crate::TestRunner {
            super::runner().with_cwd("empty_fallback_var")
        }

        #[test]
        fn empty_second_before_third() {
            let runner = runner().with_cwd("empty_second_before_third");
            assert_eq!(
                runner.err("@use \"plain\";\n"),
                "Error: Expected expression.\
         \n  ,\
         \n1 | a {b: var(--c, , d)}\
         \n  |                ^\
         \n  \'\
         \n  plain.css 1:16  @use\
         \n  input.scss 1:1  root stylesheet",
            );
        }
        #[test]
        fn invalid_second_arg_syntax() {
            let runner = runner().with_cwd("invalid_second_arg_syntax");
            assert_eq!(
                runner.err("@use \"plain\";\n"),
                "Error: Expected expression.\
         \n  ,\
         \n1 | a {b: var(--c, {})}\
         \n  |                ^\
         \n  \'\
         \n  plain.css 1:16  @use\
         \n  input.scss 1:1  root stylesheet",
            );
        }
    }
}
#[test]
fn grayscale() {
    let runner = runner().with_cwd("grayscale");
    assert_eq!(
        runner.ok("@use \"plain\";\n"),
        "a {\
         \n  b: grayscale(0.1);\
         \n}\n"
    );
}
#[test]
fn hsl() {
    let runner = runner().with_cwd("hsl");
    assert_eq!(
        runner.ok("@use \"plain\";\n"),
        "a {\
         \n  b: hsl(0, 100%, 50%);\
         \n}\n"
    );
}
#[test]
fn hsla() {
    let runner = runner().with_cwd("hsla");
    assert_eq!(
        runner.ok("@use \"plain\";\n"),
        "a {\
         \n  b: hsla(0, 100%, 50%, 0.5);\
         \n}\n"
    );
}
#[test]
fn invert() {
    let runner = runner().with_cwd("invert");
    assert_eq!(
        runner.ok("@use \"plain\";\n"),
        "a {\
         \n  b: invert(0.1);\
         \n}\n"
    );
}
#[test]
fn rgb() {
    let runner = runner().with_cwd("rgb");
    assert_eq!(
        runner.ok("@use \"plain\";\n"),
        "a {\
         \n  b: rgb(10, 20, 30);\
         \n}\n"
    );
}
#[test]
fn rgba() {
    let runner = runner().with_cwd("rgba");
    assert_eq!(
        runner.ok("@use \"plain\";\n"),
        "a {\
         \n  b: rgba(10, 20, 30, 0.5);\
         \n}\n"
    );
}
#[test]
fn saturate() {
    let runner = runner().with_cwd("saturate");
    assert_eq!(
        runner.ok("@use \"plain\";\n"),
        "a {\
         \n  b: saturate(0.1);\
         \n}\n"
    );
}