observable-array-ownkeys.window.js

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This WPT test may be referenced by the following Test IDs:
- /webidl/ecmascript-binding/observable-array-ownkeys.window.html - WPT Dashboard Interop Dashboard

"use strict";

test(() => {

  const observableArray = document.adoptedStyleSheets;

  assert_array_equals(

      Object.getOwnPropertyNames(observableArray),

      ["length"],

      "Initially only \"length\".");

  observableArray["zzz"] = true;

  observableArray["aaa"] = true;

  assert_array_equals(

      Object.getOwnPropertyNames(observableArray),

      ["length", "zzz", "aaa"],

      "Own properties whose key is a string have been added.");

  observableArray[0] = new CSSStyleSheet();

  observableArray[1] = new CSSStyleSheet();

  assert_array_equals(

      Object.getOwnPropertyNames(observableArray),

      ["0", "1", "length", "zzz", "aaa"],

      "Own properties whose key is an array index have been added.");

  observableArray[Symbol.toStringTag] = "string_tag";

  observableArray[Symbol.toPrimitive] = "primitive";

  assert_array_equals(

      Object.getOwnPropertyNames(observableArray),

      ["0", "1", "length", "zzz", "aaa"],

      "Own properties whose key is a symbol have been added (non-symbol).");

  assert_array_equals(

      Object.getOwnPropertySymbols(observableArray),

      [Symbol.toStringTag, Symbol.toPrimitive],

      "Own properties whose key is a symbol have been added (symbol).");

}, "ObservableArray's ownKeys trap");