JSTests/test262/test/annexB/built-ins/String/prototype/sub/B.2.3.13.js

// Copyright (C) 2014 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

// Tests taken from:
// http://mathias.html5.org/tests/javascript/string/

/*---
 description: >
     String.prototype.sub returns a string of HTML describing a single HTML
     subscript element. The element's content is the `this` value of the
     function invocation, coerced to a string.
 es6id: B.2.3.13
---*/

assert.sameValue('_'.sub(), '<sub>_</sub>');
assert.sameValue('<'.sub(), '<sub><</sub>');
assert.sameValue(String.prototype.sub.call(0x2A), '<sub>42</sub>');
assert.throws(TypeError, function() {
  String.prototype.sub.call(undefined);
});
assert.throws(TypeError, function() {
  String.prototype.sub.call(null);
});