Test262 Harness

A rust-lang test harness for the ECMAScript test suite.

Usage

# Cargo.toml
[dev.dependencies]
test262-harness = "*"

// lib.rs
#[test]
fn test_js() {
    let test262_path = "test262";
    let harness = Harness::new(test262_path).expect("failed to initialize harness");
    for test in harness {
        let test = test.unwrap();
        println!("running test from {:?}", test.path);
        if let Some(id) = &test.desc.id {
            println!("id: {}", id);
        }
        if let Some(id) = &test.desc.esid {
            println!("esid: {}", id);
        }
        if let Some(id) = &test.desc.es5id {
            println!("es5id: {}", id);
        }
        if let Some(id) = &test.desc.es6id {
            println!("es6id: {}", id);
        }
        if let Some(neg) = &test.desc.negative {
            print!("expecting test to fail ");
            if let Some(except) = &neg.kind {
                print!("with {}", except);
            }
            match &neg.phase {
                Phase::Parse => println!("during parsing"),
                Phase::Early => println!("after parsing but before evaluation"),
                Phase::Resolution => println!("while resolving es6 modules"),
                Phase::Runtime => println!("during evaluation"),
            }
        }
        if let Some(info) = &test.desc.info {
            println!("info: {}", info);
        }
        if let Some(desc) = &test.desc.description {
            println!("desc: {}", desc);
        }
        for name in &test.desc.includes {
            println!("import {} from the {}/harness directory", name, test262_path);
        }
        for flag in &test.desc.flags {
            match flag {
                Flag::OnlyStrict => println!("This test should only run in strict mode"),
                Flag::NoStrict => println!("This test should not run in strict mode"),
                Flag::Module => println!("This test should be run as a module only"),
                Flag::Raw => println!("This test's content should not be altered and run as not-strict only"),
                Flag::Async => println!("This test needs to be executed asynchronously"),
                Flag::Generated => println!("This test was not written by hand"),
                Flag::CanBlockIsFalse => println!("When executing [[CanBlock]] must be false"),
                Flag::CanBlockIsTrue => println!("[[CanBlock]] must be true"),
                Flag::NonDeterministic => println!("This test can pass in more than one way"),
            }
        }
        for feat in &test.desc.features {
            println!("This test is gated by the feature {}", feat);
        }
    }
}

Test is the primary way to interact with this crate, it contains a bulk of the information one would need to test a test262 file.

The Test structure includes 3 top-level properties, the path to the file being tested, the string contents of that file and the metadata, contained in the multi-line comment (as YAML) prefix to all files, about each JavaScript test.