v8/test/mjsunit/object-define-properties.js

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// Tests the Object.defineProperties method - ES 15.2.3.7
// Note that the internal DefineOwnProperty method is tested through
// object-define-property.js, this file only contains tests specific for
// Object.defineProperties. Also note that object-create.js contains
// a range of indirect tests on this method since Object.create uses
// Object.defineProperties as a step in setting up the object.

// Try defining with null as descriptor:
try {
  Object.defineProperties({}, null);
} catch(e) {
  assertTrue(/null to object/.test(e));
}

// Try defining with null as object
try {
  Object.defineProperties(null, {});
} catch(e) {
  assertTrue(/called on non-object/.test(e));
}


var desc = {foo: {value: 10}, bar: {get: function() {return 42; }}};
var obj = {};
// Check that we actually get the object back as returnvalue
var x = Object.defineProperties(obj, desc);

assertEquals(x.foo, 10);
assertEquals(x.bar, 42);


// Make sure that all property descriptors are calculated before any
// modifications are done.

var object = {};

assertThrows(function() {
    Object.defineProperties(object, {
      foo: { value: 1 },
      bar: { value: 2, get: function() { return 3; } }
    });
  }, TypeError);

assertEquals(undefined, object.foo);
assertEquals(undefined, object.bar);