javascript 0.3.0

A JavaScript engine implementation in Rust
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92

use javascript::*;

// Initialize logger for this integration test binary so `RUST_LOG` is honored.
// Using `ctor` ensures initialization runs before tests start.
#[ctor::ctor(unsafe)]
fn __init_test_logger() {
    let _ = env_logger::Builder::from_env(env_logger::Env::default()).is_test(true).try_init();
}

#[test]
fn test_reflect_apply_with_non_array_arguments_list_errors() {
    let script = "Reflect.apply(function(){}, undefined, 123)";
    let res = evaluate_script(script, false, None::<&std::path::Path>);
    assert!(res.is_err(), "expected Reflect.apply with non-array argumentsList to error");
}

#[test]
fn test_reflect_construct_with_new_target_parameter() {
    let script = r#"
        class A { constructor(v) { this.v = v } full() { return this.v; } }
        class B {}
        // When `newTarget` is provided, the constructed object's prototype is `newTarget.prototype`.
        // The target constructor body still runs and initializes `this`.
        let o = Reflect.construct(A, [42], B);
        (o.v === 42)
          && (Object.getPrototypeOf(o) === B.prototype)
          && (o instanceof B)
          && !(o instanceof A);
    "#;
    let v = evaluate_script(script, false, None::<&std::path::Path>).expect("script ran");
    assert_eq!(v, "true");
}

#[test]
fn test_reflect_apply_with_async_closure_returns_promise_resolved() {
    let script = r#"
        let fnc = async function(a){ return a + 1; };
        let p = Reflect.apply(fnc, undefined, [1]);
        await p;
    "#;
    let v = evaluate_script(script, false, None::<&std::path::Path>).expect("script ran");
    assert_eq!(v, "2");
}

#[test]
fn test_reflect_apply_with_non_callable_target_errors() {
    let script = "Reflect.apply(123, undefined, [])";
    let res = evaluate_script(script, false, None::<&std::path::Path>);
    assert!(res.is_err(), "expected Reflect.apply with non-callable target to error");
}

#[test]
fn test_reflect_apply_with_closure_and_this() {
    let script = r#"
        const obj = { x: 10 };
        function add(a, b) { return this.x + a + b; }
        // Use Reflect.apply to call `add` with receiver `obj` and args [1,2]
        let result = Reflect.apply(add, obj, [1, 2]);
        result;
    "#;

    let v = evaluate_script(script, false, None::<&std::path::Path>).expect("script ran");
    assert_eq!(v, "13");
}

#[test]
fn test_reflect_apply_with_native_function() {
    let script = r#"
        // Use Reflect.apply to call a global function (String) as a function
        // String() converts its argument to string; passing 123 should return "123"
        let res = Reflect.apply(String, undefined, [123]);
        res;
    "#;

    let v = evaluate_script(script, false, None::<&std::path::Path>).unwrap();
    assert_eq!(v, "\"123\"");
}

#[test]
fn test_reflect_construct_with_constructor_args() {
    let script = r#"
        class Person {
            constructor(first, last) { this.first = first; this.last = last; }
            full() { return this.first + ' ' + this.last; }
        }
        let p = Reflect.construct(Person, ['Jane', 'Doe']);
        p.full();
    "#;

    let v = evaluate_script(script, false, None::<&std::path::Path>).expect("script ran");
    assert_eq!(v, "\"Jane Doe\"");
}