| // Copyright (C) 2019 Alexey Shvayka. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| |
| /*--- |
| esid: sec-object.seal |
| description: > |
| O.[[PreventExtensions]]() returns abrupt completion. |
| info: | |
| Object.seal ( O ) |
| |
| ... |
| 2. Let status be ? SetIntegrityLevel(O, sealed). |
| |
| SetIntegrityLevel ( O, level ) |
| |
| ... |
| 3. Let status be ? O.[[PreventExtensions]](). |
| features: [Proxy] |
| ---*/ |
| |
| var p = new Proxy({}, { |
| preventExtensions: function() { |
| throw new Test262Error(); |
| }, |
| }); |
| |
| assert.throws(Test262Error, function() { |
| Object.seal(p); |
| }); |