JSTests/test262/test/built-ins/Promise/prototype/finally/this-value-then-not-callable.js

// Copyright (C) 2017 Jordan Harband. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
author: Jordan Harband
description: >
  Promise.prototype.finally called with a `this` value that does not define a
  callable `then` property
esid: sec-promise.prototype.finally
features: [Symbol, Promise.prototype.finally]
---*/
assert.sameValue(typeof Promise.prototype.finally, 'function');

var symbol = Symbol();

var thrower = function() {
  throw new Test262Error('this should never happen');
};

var p = new Promise(function() {});

p.then = undefined;
assert.throws(TypeError, function() {
  Promise.prototype.finally.call(p, thrower);
}, 'undefined');

p.then = null;
assert.throws(TypeError, function() {
  Promise.prototype.finally.call(p, thrower);
}, 'null');

p.then = 1;
assert.throws(TypeError, function() {
  Promise.prototype.finally.call(p, thrower);
}, 'number');

p.then = '';
assert.throws(TypeError, function() {
  Promise.prototype.finally.call(p, thrower);
}, 'string');

p.then = true;
assert.throws(TypeError, function() {
  Promise.prototype.finally.call(p, thrower);
}, 'boolean');

p.then = symbol;
assert.throws(TypeError, function() {
  Promise.prototype.finally.call(p, thrower);
}, 'symbol');

p.then = {};
assert.throws(TypeError, function() {
  Promise.prototype.finally.call(p, thrower);
}, 'ordinary object');