koffi/vendor/node-addon-api/test/object/object_freeze_seal.js

Fast and simple C FFI (foreign function interface) for Node.js

'use strict';

const assert = require('assert');

module.exports = require('../common').runTest(test);

function test (binding) {
  {
    const obj = { x: 'a', y: 'b', z: 'c' };
    assert.strictEqual(binding.object_freeze_seal.freeze(obj), true);
    assert.strictEqual(Object.isFrozen(obj), true);
    assert.throws(() => {
      obj.x = 10;
    }, /Cannot assign to read only property 'x' of object '#<Object>/);
    assert.throws(() => {
      obj.w = 15;
    }, /Cannot add property w, object is not extensible/);
    assert.throws(() => {
      delete obj.x;
    }, /Cannot delete property 'x' of #<Object>/);
  }

  {
    const obj = new Proxy({ x: 'a', y: 'b', z: 'c' }, {
      preventExtensions () {
        throw new Error('foo');
      }
    });

    assert.throws(() => {
      binding.object_freeze_seal.freeze(obj);
    }, /foo/);
  }

  {
    const obj = { x: 'a', y: 'b', z: 'c' };
    assert.strictEqual(binding.object_freeze_seal.seal(obj), true);
    assert.strictEqual(Object.isSealed(obj), true);
    assert.throws(() => {
      obj.w = 'd';
    }, /Cannot add property w, object is not extensible/);
    assert.throws(() => {
      delete obj.x;
    }, /Cannot delete property 'x' of #<Object>/);
    // Sealed objects allow updating existing properties,
    // so this should not throw.
    obj.x = 'd';
  }

  {
    const obj = new Proxy({ x: 'a', y: 'b', z: 'c' }, {
      preventExtensions () {
        throw new Error('foo');
      }
    });

    assert.throws(() => {
      binding.object_freeze_seal.seal(obj);
    }, /foo/);
  }
}