| // Copyright (C) 2016 the V8 project authors. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| /*--- |
| esid: sec-string.prototype.substring |
| es6id: 21.1.3.19 |
| description: The "this" value must be object-coercible |
| info: | |
| 1. Let O be ? RequireObjectCoercible(this value). |
| ---*/ |
| |
| var substring = String.prototype.substring; |
| |
| assert.sameValue(typeof substring, 'function'); |
| |
| assert.throws(TypeError, function() { |
| substring.call(undefined, 0, 1); |
| }, 'undefined'); |
| |
| assert.throws(TypeError, function() { |
| substring.call(null, 0, 1); |
| }, 'null'); |
