text: // 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);
  });
  