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"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");
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