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Add tests for Subclassing the built-in Number Objects

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Leonardo Balter 2016-01-08 11:54:53 -05:00
parent 67ec7fbf7b
commit f5b5ad47e5
2 changed files with 55 additions and 0 deletions
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23
test/language/subclassing/Number/regular-subclassing.js Normal file
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// Copyright (C) 2016 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
es6id: 20.1.1
description: Subclassing the Number object
info: >
20.1.1 The Number Constructor
...
The Number constructor is designed to be subclassable. It may be used as the
value of an extends clause of a class definition. Subclass constructors that
intend to inherit the specified Number behaviour must include a super call to
the Number constructor to create and initialize the subclass instance with a
[[NumberData]] internal slot.
---*/
class N extends Number {}
var n = new N(42);
assert.sameValue(n.toFixed(2), '42.00');
assert.sameValue(n.toExponential(2), '4.20e+1');

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test/language/subclassing/Number/super-must-be-called.js Normal file
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// Copyright (C) 2016 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
es6id: 20.1.1
description: Super need to be called to initialize internals
info: >
20.1.1 The Number Constructor
...
The Number constructor is designed to be subclassable. It may be used as the
value of an extends clause of a class definition. Subclass constructors that
intend to inherit the specified Number behaviour must include a super call to
the Number constructor to create and initialize the subclass instance with a
[[NumberData]] internal slot.
---*/
class N extends Number {
constructor() {}
}
assert.throws(ReferenceError, function() {
new N();
});
class N2 extends Number {
constructor() {
super();
}
}
new N2();