test262/test/language/computed-property-names/class/static/method-symbol.js

// Copyright (C) 2014 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
es6id: 12.2.5
description: >
    In a class, static computed property method names can be a symbol
includes: [compareArray.js]
---*/
var sym1 = Symbol();
var sym2 = Symbol();
class C {
  static a() { return 'A'; }
  static [sym1]() { return 'B'; }
  static c() { return 'C'; }
  static [sym2]() { return 'D'; }
}
assert.sameValue(C.a(), 'A', "`C.a()` returns `'A'`. Defined as `static a() { return 'A'; }`");
assert.sameValue(C[sym1](), 'B', "`C[sym1]()` returns `'B'`. Defined as `static [sym1]() { return 'B'; }`");
assert.sameValue(C.c(), 'C', "`C.c()` returns `'C'`. Defined as `static c() { return 'C'; }`");
assert.sameValue(C[sym2](), 'D', "`C[sym2]()` returns `'D'`. Defined as `static [sym2]() { return 'D'; }`");
assert(
  compareArray(Object.keys(C), []),
  "`compareArray(Object.keys(C), [])` returns `true`"
);
assert(
  compareArray(Object.getOwnPropertyNames(C), ['length', 'name', 'prototype', 'a', 'c']),
  "`compareArray(Object.getOwnPropertyNames(C), ['length', 'name', 'prototype', 'a', 'c'])` returns `true`"
);


// compareArray expects arguments to be sorted,
// which will cause an array containing symbols to
// throw an exception when toString() is called.
//
// Since there is no guarantee of order:
//
//    - Assert only that the symbol is present
//    - Assert that the length is correct
//
var symbols = Object.getOwnPropertySymbols(C);

assert(
  symbols.indexOf(sym1) !== -1,
  "The result of `symbols.indexOf(sym1) !== -1` is `true`, after executing `var symbols = Object.getOwnPropertySymbols(C);`"
);
assert(
  symbols.indexOf(sym2) !== -1,
  "The result of `symbols.indexOf(sym2) !== -1` is `true`, after executing `var symbols = Object.getOwnPropertySymbols(C);`"
);
assert.sameValue(
  symbols.length,
  2,
  "The value of `symbols.length` is `2`, after executing `var symbols = Object.getOwnPropertySymbols(C);`"
);