jerryscript/tests/jerry/es.next/proxy_construct.js

// Copyright JS Foundation and other contributors, http://js.foundation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

// Copyright 2015 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

var target = function () {};
var handler = { construct (target) {
  throw 42;
}};

var proxy = new Proxy(target, handler);

try {
  // opfunc_call
  new proxy(5)
  assert(false);
} catch (e) {
  assert(e === 42);
}

try {
  // 22.1.2.3.4.a
  Array.of.call(proxy);
  assert(false);
} catch (e) {
  assert(e === 42);
}

// test basic functionality
var proxy = new Proxy({},{});

try {
  new proxy();
  assert(false);
} catch (e) {
  assert(e instanceof TypeError);
}

var proxy2 = new Proxy(proxy, {});

try {
  new proxy2();
  assert(false);
} catch (e) {
  assert(e instanceof TypeError);
}

var called = false;

function Target() {
  called = true;
  this.property1 = 'value1';
};

Target.prototype = {};
var proxy = new Proxy(Target, {});

assert(called === false);

var instance = new proxy();

assert(called === true);
assert('value1' === instance.property1);
assert(Target.prototype === Object.getPrototypeOf(instance));

var proxy2 = new Proxy(proxy, {});
called = false;
var instance2 = new proxy2();

assert(called === true);
assert('value1' === instance2.property1);
assert(Target.prototype === Object.getPrototypeOf(instance));

function Target2(a, b) {
  this.sum = a + b;
};
var handler = {
  construct(t, c, args) {
      return { sum: 42 };
  }
};
var proxy = new Proxy(Target2, handler);
assert((new proxy(1, 2)).sum === 42);

function Target3(arg1, arg2) {
  this.arg1 = arg1;
  this.arg2 = arg2;
}
var seen_target, seen_arguments, seen_new_target;
var handler = {
  construct(target, args, new_target) {
    seen_target = target;
    seen_arguments = args;
    seen_new_target = new_target;
    return Reflect.construct(target, args, new_target);
  }
}
var proxy = new Proxy(Target3, handler);
var instance = new proxy('a', 'b');

assert(Target3 === seen_target);
assert(JSON.stringify(seen_arguments) === '["a","b"]');
assert(proxy === seen_new_target);
assert('a' === instance.arg1);
assert('b' === instance.arg2);

var instance2 = Reflect.construct(proxy, ['a1', 'b1'], Array);
assert(Target3 === seen_target);
assert(JSON.stringify(seen_arguments) === '["a1","b1"]');
assert(Array === seen_new_target);
assert('a1'=== instance2.arg1);
assert('b1' === instance2.arg2);

var p = new Proxy(function() {}, {
  construct: function(target, argumentsList, newTarget) {
    throw 42;
  }
});

try {
  new p();
  assert(false);
} catch (e) {
  assert(e === 42);
}

// test when invariants gets violated
var p = new Proxy(function() {}, {
  construct: function(target, argumentsList, newTarget) {
    return 1;
  }
});

try {
  new p();
  assert(false);
} catch (e) {
  assert(e instanceof TypeError); 
}

var p = new Proxy({}, {
  construct: function(target, argumentsList, newTarget) {
    return {};
  }
});

try {
  new p();
  assert(false);
} catch (e) {
  assert(e instanceof TypeError); 
}