v8/test/mjsunit/harmony/proxies-symbols.js

// Copyright 2013 the V8 project authors. All rights reserved.
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// Flags: --harmony-proxies --harmony-symbols


// Helper.

function TestWithProxies(test, x, y, z) {
  test(Proxy.create, x, y, z)
  test(function(h) {return Proxy.createFunction(h, function() {})}, x, y, z)
}


// No symbols should leak to proxy traps.

function TestNoSymbolsToTrap(handler) {
  TestWithProxies(TestNoSymbolsToTrap2, handler)
}

function TestNoSymbolsToTrap2(create, handler) {
  var p = create(handler)
  var o = Object.create(p)
  var symbol = Symbol("secret")

  assertFalse(symbol in p)
  assertFalse(symbol in o)
  assertEquals(undefined, p[symbol])
  assertEquals(undefined, o[symbol])
  assertEquals(47, p[symbol] = 47)
  assertEquals(47, o[symbol] = 47)
  assertFalse(delete p[symbol])
  assertTrue(delete o[symbol])
  assertTrue(delete o[symbol])
  assertFalse({}.hasOwnProperty.call(p, symbol))
  assertFalse({}.hasOwnProperty.call(o, symbol))
  assertEquals(undefined, Object.getOwnPropertyDescriptor(p, symbol))
  assertEquals(undefined, Object.getOwnPropertyDescriptor(o, symbol))
}


TestNoSymbolsToTrap({
  has: assertUnreachable,
  hasOwn: assertUnreachable,
  get: assertUnreachable,
  set: assertUnreachable,
  delete: assertUnreachable,
  getPropertyDescriptor: assertUnreachable,
  getOwnPropertyDescriptor: assertUnreachable,
  defineProperty: assertUnreachable
})


// All symbols returned from proxy traps should be filtered.

function TestNoSymbolsFromTrap(handler) {
  TestWithProxies(TestNoSymbolsFromTrap2, handler)
}

function TestNoSymbolsFromTrap2(create, handler) {
  var p = create(handler)
  var o = Object.create(p)

  assertEquals(0, Object.keys(p).length)
  assertEquals(0, Object.keys(o).length)
  assertEquals(0, Object.getOwnPropertyNames(p).length)
  assertEquals(0, Object.getOwnPropertyNames(o).length)
  for (var n in p) assertUnreachable()
  for (var n in o) assertUnreachable()
}


function MakeSymbolArray() {
  return [Symbol(), Symbol("a")]
}

TestNoSymbolsFromTrap({
  enumerate: MakeSymbolArray,
  keys: MakeSymbolArray,
  getPropertyNames: MakeSymbolArray,
  getOwnPropertyNames: MakeSymbolArray
})