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