Function testDefineProperty

deps/v8/test/mjsunit/object-define-property.js:912–928

(obj, propertyName, desc, resultDesc)

assertEquals(undefined, o.x);

function testDefineProperty(obj, propertyName, desc, resultDesc) {
  Object.defineProperty(obj, propertyName, desc);
  var actualDesc = Object.getOwnPropertyDescriptor(obj, propertyName);
  assertEquals(resultDesc.enumerable, actualDesc.enumerable);
  assertEquals(resultDesc.configurable, actualDesc.configurable);
  if (resultDesc.hasOwnProperty('value')) {
    assertEquals(resultDesc.value, actualDesc.value);
    assertEquals(resultDesc.writable, actualDesc.writable);
    assertFalse(resultDesc.hasOwnProperty('get'));
    assertFalse(resultDesc.hasOwnProperty('set'));
  } else {
    assertEquals(resultDesc.get, actualDesc.get);
    assertEquals(resultDesc.set, actualDesc.set);
    assertFalse(resultDesc.hasOwnProperty('value'));
    assertFalse(resultDesc.hasOwnProperty('writable'));
  }
}

// tests redefining existing property with a generic descriptor
o = { p : 42 };