jerryscript/tests/jerry/object-define-properties.js

// Copyright JS Foundation and other contributors, http://js.foundation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

var obj = {};
Object.defineProperties(obj, {
  "foo": {
    value: true,
    writable: true
  },
  "bar": {
    value: "baz",
    writable: false
  },
  "Hello": {
    value: "world",
    writable: false
  },
  "inner_object": {
    value : {
      "a" : 1,
      "b" : {
        value: "foo"
      }
    }
  }
});

assert (obj.foo === true);
assert (obj.bar === "baz");
assert (obj.Hello === "world");
assert (obj.inner_object.a === 1);
assert (obj.inner_object.b.value === "foo");

// These cases should throw TypeError
try {
  Object.defineProperties(obj, undefined);
  assert (false);
} catch (e) {
  assert (e instanceof TypeError);
}

try {
  Object.defineProperties(obj, null);
  assert (false);
} catch (e) {
  assert (e instanceof TypeError);
}

try {
  Object.defineProperties(undefined, {
    "foo": {
      value: true,
      writable: true
    }
  });
  assert (false);
} catch (e) {
  assert (e instanceof TypeError);
}

// Check for internal assert, see issue #131.
try {
  Object.defineProperties([], undefined);
  assert (false);
} catch (e) {
  assert (e instanceof TypeError);
}

// If one of the properties is wrong than it shouldn't update the object.
var obj2 = {
  a: 5
};
try {
  Object.defineProperties(obj2, {
    "foo": {
      value: true,
      writable: true
    },
    "bar": {
      value: 3,
      set: 3
    },
    "Hello": {
      value: "world",
      writable: false
    }
  });
  assert (false);
} catch (e) {
  assert (e instanceof TypeError);
  assert (obj2.foo === undefined);
  assert (obj2.set === undefined);
  assert (obj2.Hello === undefined);
  assert (obj2.a === 5);
}

// Define accessors
var obj = {};
Object.defineProperties(obj, {
  "foo": {
    value: 42,
    writable: true,
  },
  "bar": {
    get: function() { return this.foo },
    set: function(v) { this.foo = v }
  }
});

assert (obj.bar === 42);
obj.bar = "baz";
assert (obj.foo === "baz");

// Define get method which throws error
var obj = {};
var props = {
  prop1: {
    value: 1,
    writable: true,
  },
  get bar() {
    throw new TypeError("foo");
    return { value : 2, writable : true };
  },
  prop2: {
    value: 3,
    writable: true,
  },
  prop3: {
    value: 4,
    writable: true,
  }
};

try {
  Object.defineProperties(obj, props);
  assert (false);
} catch (e) {
  assert (e instanceof TypeError);
  assert (e.message === "foo");
}

// Define get method which deletes a property
var obj = {};
Object.defineProperties(obj, {
  "foo": {
    value: 42,
    writable: true,
  },
  "a": {
    value: "b",
    configurable: true
  },
  "bar": {
    get: function() {
      delete this.a;
      return this.foo;
    },
  }
});

assert (obj.a === "b");
assert (obj.bar === 42);
assert (obj.a === undefined);

var obj = {};
var props = {
  prop1: {
    value: 1,
    writable: true,
  },
  get bar() {
    delete props.prop1;
    delete props.prop2;
    return { value : 2, writable : true };
  },
  prop2: {
    value: 3,
    writable: true,
  },
  prop3: {
    value: 4,
    writable: true,
  }
};

Object.defineProperties(obj, props);
var bar_desc = Object.getOwnPropertyDescriptor(obj, 'bar');
assert(bar_desc.value === 2);
assert(bar_desc.writable === true);
assert(obj.prop2 === undefined);

var prop1_desc = Object.getOwnPropertyDescriptor(obj, 'prop1');
var prop3_desc = Object.getOwnPropertyDescriptor(obj, 'prop3');
assert(prop1_desc.value === 1);
assert(prop1_desc.writable === true);
assert(prop3_desc.value === 4);
assert(prop3_desc.writable === true);