cargo/tests/testsuite/config.rs

use cargotest::support::{execs, project};
use hamcrest::assert_that;

#[test]
fn read_env_vars_for_config() {
    let p = project("foo")
        .file(
            "Cargo.toml",
            r#"
            [package]
            name = "foo"
            authors = []
            version = "0.0.0"
            build = "build.rs"
        "#,
        )
        .file("src/lib.rs", "")
        .file(
            "build.rs",
            r#"
            use std::env;
            fn main() {
                assert_eq!(env::var("NUM_JOBS").unwrap(), "100");
            }
        "#,
        )
        .build();

    assert_that(
        p.cargo("build").env("CARGO_BUILD_JOBS", "100"),
        execs().with_status(0),
    );
}