v8/test/mjsunit/object-get-own-property-names.js

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// Test ES5 section 15.2.3.4 Object.getOwnPropertyNames.

// Check simple cases.
var obj = {};
assertEquals(0, Object.getOwnPropertyNames(obj).length);

var obj = { a: 1, b: 2};
var propertyNames = Object.getOwnPropertyNames(obj);
propertyNames.sort();
assertEquals(2, propertyNames.length);
assertEquals("a", propertyNames[0]);
assertEquals("b", propertyNames[1]);

var obj = { a: function(){}, b: function(){} };
var propertyNames = Object.getOwnPropertyNames(obj);
propertyNames.sort();
assertEquals(2, propertyNames.length);
assertEquals("a", propertyNames[0]);
assertEquals("b", propertyNames[1]);

// Check slow case
var obj = { a: 1, b: 2, c: 3 };
delete obj.b;
var propertyNames = Object.getOwnPropertyNames(obj)
propertyNames.sort();
assertEquals(2, propertyNames.length);
assertEquals("a", propertyNames[0]);
assertEquals("c", propertyNames[1]);

// Check that non-enumerable properties are being returned.
var obj = {};
Object.defineProperty(obj, 'x', {
  value: 1,
  enumerable: false
});
assertEquals(1, Object.getOwnPropertyNames(obj).length);

var propertyNames = Object.getOwnPropertyNames([1, 2]);
propertyNames.sort();
assertEquals(3, propertyNames.length);
assertEquals("0", propertyNames[0]);
assertEquals("1", propertyNames[1]);
assertEquals("string", typeof propertyNames[0]);
assertEquals("string", typeof propertyNames[1]);
assertEquals("length", propertyNames[2]);

// Check that no proto properties are returned.
var obj = { foo: "foo" };
obj.__proto__ = { bar: "bar" };
propertyNames = Object.getOwnPropertyNames(obj);
propertyNames.sort();
assertEquals(1, propertyNames.length);
assertEquals("foo", propertyNames[0]);

// Check that getter properties are returned.
var obj = {};
obj.__defineGetter__("getter", function() {});
propertyNames = Object.getOwnPropertyNames(obj);
propertyNames.sort();
assertEquals(1, propertyNames.length);
assertEquals("getter", propertyNames[0]);

// Check that implementation does not access Array.prototype.
var savedConcat = Array.prototype.concat;
Array.prototype.concat = function() { return []; }
propertyNames = Object.getOwnPropertyNames({0: 'foo', bar: 'baz'});
assertEquals(2, propertyNames.length);
assertEquals('0', propertyNames[0]);
assertEquals('bar', propertyNames[1]);
assertSame(Array.prototype, propertyNames.__proto__);
Array.prototype.concat = savedConcat;

assertEquals(Object.getOwnPropertyNames(4), []);
assertEquals(Object.getOwnPropertyNames("foo"), ["0", "1", "2", "length"]);
assertEquals(Object.getOwnPropertyNames(true), []);

try {
  Object.getOwnPropertyNames(undefined);
  assertTrue(false);
} catch (e) {
  assertTrue(/Cannot convert undefined or null to object/.test(e));
}

try {
  Object.getOwnPropertyNames(null);
  assertTrue(false);
} catch (e) {
  assertTrue(/Cannot convert undefined or null to object/.test(e));
}