text: // Copyright 2009 the V8 project authors. All rights reserved.
  // Redistribution and use in source and binary forms, with or without
  // modification, are permitted provided that the following conditions are
  // met:
  //
  //     * Redistributions of source code must retain the above copyright
  //       notice, this list of conditions and the following disclaimer.
  //     * Redistributions in binary form must reproduce the above
  //       copyright notice, this list of conditions and the following
  //       disclaimer in the documentation and/or other materials provided
  //       with the distribution.
  //     * Neither the name of Google Inc. nor the names of its
  //       contributors may be used to endorse or promote products derived
  //       from this software without specific prior written permission.
  //
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  // Test ES5 section 15.2.3.4 Object.getOwnPropertyNames.
  
  // Check simple cases.
  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 propertyNames = Object.getOwnPropertyNames([1, 2]);
  propertyNames.sort();
  assertEquals(3, propertyNames.length);
  assertEquals("0", propertyNames[0]);
  assertEquals("1", 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]);
  
  try {
    Object.getOwnPropertyNames(4);
    assertTrue(false);
  } catch (e) {
    assertTrue(/on non-object/.test(e));
  }
  
  try {
    Object.getOwnPropertyNames("foo");
    assertTrue(false);
  } catch (e) {
    assertTrue(/on non-object/.test(e));
  }
  
  try {
    Object.getOwnPropertyNames(undefined);
    assertTrue(false);
  } catch (e) {
    assertTrue(/on non-object/.test(e));
  }
  
  try {
    Object.getOwnPropertyNames(null);
    assertTrue(false);
  } catch (e) {
    assertTrue(/on non-object/.test(e));
  }
  