boa_engine 0.22.0

Boa is a Javascript lexer, parser and compiler written in Rust. Currently, it has support for some of the language.
Documentation 
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mod miri {

    use indoc::indoc;

    use crate::{TestAction, run_test_actions};

    #[test]
    fn finalization_registry_simple() {
        run_test_actions([
            TestAction::run(indoc! {r#"
            let counter = 0;
            const registry = new FinalizationRegistry(() => {
                counter++;
            });

            registry.register(["foo"]);
        "#}),
            TestAction::assert_eq("counter", 0),
            TestAction::inspect_context(|_| boa_gc::force_collect()),
            TestAction::inspect_context(|ctx| ctx.run_jobs().unwrap()),
            // Callback should run at least once
            TestAction::assert_eq("counter", 1),
        ]);
    }

    #[test]
    fn finalization_registry_unregister() {
        run_test_actions([
            TestAction::run(indoc! {r#"
            let counter = 0;
            const registry = new FinalizationRegistry(() => {
                counter++;
            });

            {
                let array = ["foo"];
                registry.register(array, undefined, array);
                registry.unregister(array);
            }

        "#}),
            TestAction::assert_eq("counter", 0),
            TestAction::inspect_context(|_| boa_gc::force_collect()),
            TestAction::inspect_context(|ctx| ctx.run_jobs().unwrap()),
            // Callback shouldn't run
            TestAction::assert_eq("counter", 0),
        ]);
    }

    #[test]
    fn finalization_registry_held_value_handover() {
        run_test_actions([
            TestAction::run(indoc! {r#"
            let counter = 0;
            const registry = new FinalizationRegistry((value) => {
                counter += value.increment;
            });

            registry.register(["foo"], { increment: 5 });
        "#}),
            TestAction::assert_eq("counter", 0),
            TestAction::inspect_context(|_| boa_gc::force_collect()),
            TestAction::inspect_context(|ctx| ctx.run_jobs().unwrap()),
            // Registry should handover the held value as argument
            TestAction::assert_eq("counter", 5),
        ]);
    }

    #[test]
    fn finalization_registry_unrelated_unregister_token() {
        run_test_actions([
            TestAction::run(indoc! {r#"
            let counter = 0;

            const registry = new FinalizationRegistry((value) => {
                counter += 1;
            });

            registry.register(["foo"], undefined, {});
            registry.unregister({});
        "#}),
            TestAction::assert_eq("counter", 0),
            TestAction::inspect_context(|_| boa_gc::force_collect()),
            TestAction::inspect_context(|ctx| ctx.run_jobs().unwrap()),
            // Object should not have been unregistered if the token is not the correct one
            TestAction::assert_eq("counter", 1),
        ]);
    }
}