//! Bazel-wired proof-of-concept crate reserved for future V8 experiments./// Returns the Bazel label for this proof-of-concept crate.#[must_use]pub fn bazel_target() -> &'static str {    "//codex-rs/v8-poc:v8-poc"}/// Returns the embedded V8 version.#[must_use]pub fn embedded_v8_version() -> &'static str {    v8::V8::get_version()}/// Returns whether the linked V8 library was built with the in-process sandbox.#[must_use]pub fn linked_v8_has_sandbox() -> bool {    unsafe extern "C" {        fn v8__V8__IsSandboxEnabled() -> bool;    }    // `rusty_v8` exposes this symbol for its own sandbox verification tests.    unsafe { v8__V8__IsSandboxEnabled() }}#[cfg(test)]mod tests {    use pretty_assertions::assert_eq;    use std::sync::Once;    use super::bazel_target;    fn initialize_v8() {        static INIT: Once = Once::new();        INIT.call_once(|| {            v8::V8::initialize_platform(v8::new_default_platform(0, false).make_shared());            v8::V8::initialize();        });    }    fn evaluate_expression(expression: &str) -> String {        initialize_v8();        let isolate = &mut v8::Isolate::new(Default::default());        v8::scope!(let scope, isolate);        let context = v8::Context::new(scope, Default::default());        let scope = &mut v8::ContextScope::new(scope, context);        let source = v8::String::new(scope, expression).expect("expression should be valid UTF-8");        let script = v8::Script::compile(scope, source, None).expect("expression should compile");        let result = script.run(scope).expect("expression should evaluate");        result.to_rust_string_lossy(scope)    }    #[test]    fn exposes_expected_bazel_target() {        assert_eq!(bazel_target(), "//codex-rs/v8-poc:v8-poc");    }    #[test]    fn exposes_embedded_v8_version() {        assert!(!super::embedded_v8_version().is_empty());    }    #[test]    fn sandbox_feature_matches_linked_v8() {        assert_eq!(super::linked_v8_has_sandbox(), cfg!(feature = "sandbox"));    }    #[test]    fn evaluates_integer_addition() {        assert_eq!(evaluate_expression("1 + 2"), "3");    }    #[test]    fn evaluates_string_concatenation() {        assert_eq!(evaluate_expression("'hello ' + 'world'"), "hello world");    }    #[test]    fn parses_crdtp_dispatchable_messages() {        let cbor = v8::crdtp::json_to_cbor(br#"{"id":7,"method":"Runtime.evaluate","params":{}}"#)            .expect("JSON should convert to CBOR");        let dispatchable = v8::crdtp::Dispatchable::new(&cbor);        assert!(dispatchable.ok());        assert_eq!(dispatchable.call_id(), 7);        assert_eq!(dispatchable.method(), b"Runtime.evaluate");    }}