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
|
describe("[[Call]] trap normal behavior", () => {
test("forwarding when not defined in handler", () => {
let p = new Proxy(() => 5, { apply: null });
expect(p()).toBe(5);
p = new Proxy(() => 5, { apply: undefined });
expect(p()).toBe(5);
p = new Proxy(() => 5, {});
expect(p()).toBe(5);
});
test("correct arguments supplied to trap", () => {
const f = (a, b) => a + b;
const handler = {
apply(target, this_, arguments) {
expect(target).toBe(f);
expect(this_).toBe(handler);
if (arguments[2]) return arguments[0] * arguments[1];
return f(...arguments);
},
};
p = new Proxy(f, handler);
expect(p(2, 4)).toBe(6);
expect(p(2, 4, true)).toBe(8);
});
});
describe("[[Call]] invariants", () => {
test("target must have a [[Call]] slot", () => {
[{}, [], new Proxy({}, {})].forEach(item => {
expect(() => {
new Proxy(item, {})();
}).toThrowWithMessage(TypeError, "[object ProxyObject] is not a function");
});
});
});
|
