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// Copyright 2014 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.
// Flags: --harmony-proxies
// TODO(arv): Once proxies can intercept symbols, add more tests.
function TestBasics() {
var log = [];
var proxy = Proxy.create({
getPropertyDescriptor: function(key) {
log.push(key);
if (key === 'x') {
return {
value: 1,
configurable: true
};
}
return undefined;
}
});
var x = 'local';
with (proxy) {
assertEquals(1, x);
}
// One 'x' for HasBinding and one for GetBindingValue
assertEquals(['assertEquals', 'x', 'x'], log);
}
TestBasics();
function TestInconsistent() {
var log = [];
var calls = 0;
var proxy = Proxy.create({
getPropertyDescriptor: function(key) {
log.push(key);
if (key === 'x' && calls < 1) {
calls++;
return {
value: 1,
configurable: true
};
}
return undefined;
}
});
var x = 'local';
with (proxy) {
assertEquals(void 0, x);
}
// One 'x' for HasBinding and one for GetBindingValue
assertEquals(['assertEquals', 'x', 'x'], log);
}
TestInconsistent();
function TestUseProxyAsUnscopables() {
var x = 1;
var object = {
x: 2
};
var calls = 0;
var proxy = Proxy.create({
has: function(key) {
calls++;
assertEquals('x', key);
return calls === 2;
},
getPropertyDescriptor: function(key) {
assertUnreachable();
}
});
object[Symbol.unscopables] = proxy;
with (object) {
assertEquals(2, x);
assertEquals(1, x);
}
// HasBinding, HasBinding
assertEquals(2, calls);
}
TestUseProxyAsUnscopables();
function TestThrowInHasUnscopables() {
var x = 1;
var object = {
x: 2
};
function CustomError() {}
var calls = 0;
var proxy = Proxy.create({
has: function(key) {
if (calls++ === 0) {
throw new CustomError();
}
assertUnreachable();
},
getPropertyDescriptor: function(key) {
assertUnreachable();
}
});
object[Symbol.unscopables] = proxy;
assertThrows(function() {
with (object) {
x;
}
}, CustomError);
}
TestThrowInHasUnscopables();
var global = this;
function TestGlobalShouldIgnoreUnscopables() {
global.x = 1;
var proxy = Proxy.create({
getPropertyDescriptor: function() {
assertUnreachable();
}
});
global[Symbol.unscopables] = proxy;
assertEquals(1, global.x);
assertEquals(1, x);
global.x = 2;
assertEquals(2, global.x);
assertEquals(2, x);
x = 3;
assertEquals(3, global.x);
assertEquals(3, x);
}
TestGlobalShouldIgnoreUnscopables();
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