v8/test/mjsunit/harmony/collections.js

// Copyright 2011 the V8 project authors. All rights reserved.
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// Flags: --harmony-collections --expose-gc


// Test valid getter and setter calls on Sets.
function TestValidSetCalls(m) {
  assertDoesNotThrow(function () { m.add(new Object) });
  assertDoesNotThrow(function () { m.has(new Object) });
  assertDoesNotThrow(function () { m.delete(new Object) });
}
TestValidSetCalls(new Set);


// Test valid getter and setter calls on Maps and WeakMaps
function TestValidMapCalls(m) {
  assertDoesNotThrow(function () { m.get(new Object) });
  assertDoesNotThrow(function () { m.set(new Object) });
  assertDoesNotThrow(function () { m.has(new Object) });
  assertDoesNotThrow(function () { m.delete(new Object) });
}
TestValidMapCalls(new Map);
TestValidMapCalls(new WeakMap);


// Test invalid getter and setter calls for WeakMap only
function TestInvalidCalls(m) {
  assertThrows(function () { m.get(undefined) }, TypeError);
  assertThrows(function () { m.set(undefined, 0) }, TypeError);
  assertThrows(function () { m.get(null) }, TypeError);
  assertThrows(function () { m.set(null, 0) }, TypeError);
  assertThrows(function () { m.get(0) }, TypeError);
  assertThrows(function () { m.set(0, 0) }, TypeError);
  assertThrows(function () { m.get('a-key') }, TypeError);
  assertThrows(function () { m.set('a-key', 0) }, TypeError);
}
TestInvalidCalls(new WeakMap);


// Test expected behavior for Sets
function TestSet(set, key) {
  assertFalse(set.has(key));
  set.add(key);
  assertTrue(set.has(key));
  set.delete(key);
  assertFalse(set.has(key));
}
function TestSetBehavior(set) {
  for (var i = 0; i < 20; i++) {
    TestSet(set, new Object);
    TestSet(set, i);
    TestSet(set, i / 100);
    TestSet(set, 'key-' + i);
  }
  var keys = [ +0, -0, +Infinity, -Infinity, true, false, null, undefined ];
  for (var i = 0; i < keys.length; i++) {
    TestSet(set, keys[i]);
  }
}
TestSetBehavior(new Set);


// Test expected mapping behavior for Maps and WeakMaps
function TestMapping(map, key, value) {
  map.set(key, value);
  assertSame(value, map.get(key));
}
function TestMapBehavior1(m) {
  TestMapping(m, new Object, 23);
  TestMapping(m, new Object, 'the-value');
  TestMapping(m, new Object, new Object);
}
TestMapBehavior1(new Map);
TestMapBehavior1(new WeakMap);


// Test expected mapping behavior for Maps only
function TestMapBehavior2(m) {
  for (var i = 0; i < 20; i++) {
    TestMapping(m, i, new Object);
    TestMapping(m, i / 10, new Object);
    TestMapping(m, 'key-' + i, new Object);
  }
  var keys = [ +0, -0, +Infinity, -Infinity, true, false, null, undefined ];
  for (var i = 0; i < keys.length; i++) {
    TestMapping(m, keys[i], new Object);
  }
}
TestMapBehavior2(new Map);


// Test expected querying behavior of Maps and WeakMaps
function TestQuery(m) {
  var key = new Object;
  TestMapping(m, key, 'to-be-present');
  assertTrue(m.has(key));
  assertFalse(m.has(new Object));
  TestMapping(m, key, undefined);
  assertFalse(m.has(key));
  assertFalse(m.has(new Object));
}
TestQuery(new Map);
TestQuery(new WeakMap);


// Test expected deletion behavior of Maps and WeakMaps
function TestDelete(m) {
  var key = new Object;
  TestMapping(m, key, 'to-be-deleted');
  assertTrue(m.delete(key));
  assertFalse(m.delete(key));
  assertFalse(m.delete(new Object));
  assertSame(m.get(key), undefined);
}
TestDelete(new Map);
TestDelete(new WeakMap);


// Test GC of Maps and WeakMaps with entry
function TestGC1(m) {
  var key = new Object;
  m.set(key, 'not-collected');
  gc();
  assertSame('not-collected', m.get(key));
}
TestGC1(new Map);
TestGC1(new WeakMap);


// Test GC of Maps and WeakMaps with chained entries
function TestGC2(m) {
  var head = new Object;
  for (key = head, i = 0; i < 10; i++, key = m.get(key)) {
    m.set(key, new Object);
  }
  gc();
  var count = 0;
  for (key = head; key != undefined; key = m.get(key)) {
    count++;
  }
  assertEquals(11, count);
}
TestGC2(new Map);
TestGC2(new WeakMap);


// Test property attribute [[Enumerable]]
function TestEnumerable(func) {
  function props(x) {
    var array = [];
    for (var p in x) array.push(p);
    return array.sort();
  }
  assertArrayEquals([], props(func));
  assertArrayEquals([], props(func.prototype));
  assertArrayEquals([], props(new func()));
}
TestEnumerable(Set);
TestEnumerable(Map);
TestEnumerable(WeakMap);


// Test arbitrary properties on Maps and WeakMaps
function TestArbitrary(m) {
  function TestProperty(map, property, value) {
    map[property] = value;
    assertEquals(value, map[property]);
  }
  for (var i = 0; i < 20; i++) {
    TestProperty(m, i, 'val' + i);
    TestProperty(m, 'foo' + i, 'bar' + i);
  }
  TestMapping(m, new Object, 'foobar');
}
TestArbitrary(new Map);
TestArbitrary(new WeakMap);


// Test direct constructor call
assertTrue(Set() instanceof Set);
assertTrue(Map() instanceof Map);
assertTrue(WeakMap() instanceof WeakMap);


// Test whether NaN values as keys are treated correctly.
var s = new Set;
assertFalse(s.has(NaN));
assertFalse(s.has(NaN + 1));
assertFalse(s.has(23));
s.add(NaN);
assertTrue(s.has(NaN));
assertTrue(s.has(NaN + 1));
assertFalse(s.has(23));
var m = new Map;
assertFalse(m.has(NaN));
assertFalse(m.has(NaN + 1));
assertFalse(m.has(23));
m.set(NaN, 'a-value');
assertTrue(m.has(NaN));
assertTrue(m.has(NaN + 1));
assertFalse(m.has(23));


// Test some common JavaScript idioms for Sets
var s = new Set;
assertTrue(s instanceof Set);
assertTrue(Set.prototype.add instanceof Function)
assertTrue(Set.prototype.has instanceof Function)
assertTrue(Set.prototype.delete instanceof Function)


// Test some common JavaScript idioms for Maps
var m = new Map;
assertTrue(m instanceof Map);
assertTrue(Map.prototype.set instanceof Function)
assertTrue(Map.prototype.get instanceof Function)
assertTrue(Map.prototype.has instanceof Function)
assertTrue(Map.prototype.delete instanceof Function)


// Test some common JavaScript idioms for WeakMaps
var m = new WeakMap;
assertTrue(m instanceof WeakMap);
assertTrue(WeakMap.prototype.set instanceof Function)
assertTrue(WeakMap.prototype.get instanceof Function)
assertTrue(WeakMap.prototype.has instanceof Function)
assertTrue(WeakMap.prototype.delete instanceof Function)


// Regression test for WeakMap prototype.
assertTrue(WeakMap.prototype.constructor === WeakMap)
assertTrue(Object.getPrototypeOf(WeakMap.prototype) === Object.prototype)


// Regression test for issue 1617: The prototype of the WeakMap constructor
// needs to be unique (i.e. different from the one of the Object constructor).
assertFalse(WeakMap.prototype === Object.prototype);
var o = Object.create({});
assertFalse("get" in o);
assertFalse("set" in o);
assertEquals(undefined, o.get);
assertEquals(undefined, o.set);
var o = Object.create({}, { myValue: {
  value: 10,
  enumerable: false,
  configurable: true,
  writable: true
}});
assertEquals(10, o.myValue);


// Stress Test
// There is a proposed stress-test available at the es-discuss mailing list
// which cannot be reasonably automated.  Check it out by hand if you like:
// https://mail.mozilla.org/pipermail/es-discuss/2011-May/014096.html