138 lines
3.6 KiB
JavaScript
138 lines
3.6 KiB
JavaScript
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// Copyright 2015 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Flags: --harmony-proxies --harmony-reflect
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// Tests the interaction of Function.prototype.bind with proxies.
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// (Helper)
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var log = [];
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var logger = {};
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var handler = new Proxy({}, logger);
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logger.get = function(t, trap, r) {
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return function() {
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log.push([trap, ...arguments]);
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return Reflect[trap](...arguments);
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}
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};
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// Simple case
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var target = function(a, b, c) { "use strict"; return this };
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var proxy = new Proxy(target, handler);
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var this_value = Symbol();
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log.length = 0;
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result = Function.prototype.bind.call(proxy, this_value, "foo");
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assertEquals(2, result.length);
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assertEquals(target.__proto__, result.__proto__);
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assertEquals(this_value, result());
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assertEquals(5, log.length);
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for (var i in log) assertSame(target, log[i][1]);
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assertEquals(["getPrototypeOf", target], log[0]);
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assertEquals(["getOwnPropertyDescriptor", target, "length"], log[1]);
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assertEquals(["get", target, "length", proxy], log[2]);
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assertEquals(["get", target, "name", proxy], log[3]);
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assertEquals(["apply", target, this_value, ["foo"]], log[4]);
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assertEquals(new target(), new result());
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// Custom prototype
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log.length = 0;
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target.__proto__ = {radio: "gaga"};
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result = Function.prototype.bind.call(proxy, this_value, "foo");
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assertEquals(2, result.length);
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assertSame(target.__proto__, result.__proto__);
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assertEquals(this_value, result());
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assertEquals(5, log.length);
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for (var i in log) assertSame(target, log[i][1]);
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assertEquals(["getPrototypeOf", target], log[0]);
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assertEquals(["getOwnPropertyDescriptor", target, "length"], log[1]);
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assertEquals(["get", target, "length", proxy], log[2]);
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assertEquals(["get", target, "name", proxy], log[3]);
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assertEquals(["apply", target, this_value, ["foo"]], log[4]);
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// Custom length
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handler = {
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get() {return 42},
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getOwnPropertyDescriptor() {return {configurable: true}}
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};
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proxy = new Proxy(target, handler);
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result = Function.prototype.bind.call(proxy, this_value, "foo");
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assertEquals(41, result.length);
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assertEquals(this_value, result());
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// Long length
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handler = {
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get() {return Math.pow(2, 100)},
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getOwnPropertyDescriptor() {return {configurable: true}}
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};
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proxy = new Proxy(target, handler);
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result = Function.prototype.bind.call(proxy, this_value, "foo");
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assertEquals(Math.pow(2, 100) - 1, result.length);
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assertEquals(this_value, result());
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// Very long length
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handler = {
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get() {return 1/0},
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getOwnPropertyDescriptor() {return {configurable: true}}
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};
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proxy = new Proxy(target, handler);
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result = Function.prototype.bind.call(proxy, this_value, "foo");
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assertEquals(1/0, result.length);
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assertEquals(this_value, result());
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// Non-integer length
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handler = {
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get() {return 4.2},
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getOwnPropertyDescriptor() {return {configurable: true}}
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};
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proxy = new Proxy(target, handler);
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result = Function.prototype.bind.call(proxy, this_value, "foo");
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assertEquals(3, result.length);
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assertEquals(this_value, result());
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// Undefined length
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handler = {
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get() {},
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getOwnPropertyDescriptor() {return {configurable: true}}
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};
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proxy = new Proxy(target, handler);
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result = Function.prototype.bind.call(proxy, this_value, "foo");
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assertEquals(0, result.length);
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assertEquals(this_value, result());
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// Non-callable
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assertThrows(() => Function.prototype.bind.call(new Proxy({}, {})), TypeError);
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assertThrows(() => Function.prototype.bind.call(new Proxy([], {})), TypeError);
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// Non-constructable
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result = Function.prototype.bind.call(() => 42, this_value, "foo");
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assertEquals(42, result());
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assertThrows(() => new result());
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