length.js - mozsearch

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// |reftest| skip-if(!this.hasOwnProperty("Tuple"))

var desc = Object.getOwnPropertyDescriptor(Tuple.prototype.concat, "length");

assertEq(desc.value, 0);

assertEq(desc.writable, false);

assertEq(desc.enumerable, false);

assertEq(desc.configurable, true);

desc = Object.getOwnPropertyDescriptor(Tuple.prototype.concat, "name");

assertEq(desc.value, "concat");

assertEq(desc.writable, false);

assertEq(desc.enumerable, false);

assertEq(desc.configurable, true);

desc = Object.getOwnPropertyDescriptor(Tuple.prototype, "concat");

assertEq(desc.writable, true);

assertEq(desc.enumerable, false);

assertEq(desc.configurable, true);

assertEq(isConstructor(Tuple.prototype.concat), false);

assertThrowsInstanceOf(() => {

  let t = #[1];

  new t.concat();

}, TypeError, '`let t = #[1]; new t.concat()` throws TypeError');

reportCompare(0, 0);