DOMException-custom-bindings.any.js

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// META: global=window,dedicatedworker,shadowrealm

"use strict";

test(() => {

  assert_throws_js(TypeError, () => DOMException());

}, "Cannot construct without new");

test(() => {

  assert_equals(Object.getPrototypeOf(DOMException.prototype), Error.prototype);

}, "inherits from Error: prototype-side");

test(() => {

  assert_equals(Object.getPrototypeOf(DOMException), Function.prototype);

}, "does not inherit from Error: class-side");

test(() => {

  const e = new DOMException("message", "name");

  assert_false(e.hasOwnProperty("message"), "property is not own");

  const propDesc = Object.getOwnPropertyDescriptor(DOMException.prototype, "message");

  assert_equals(typeof propDesc.get, "function", "property descriptor is a getter");

  assert_equals(propDesc.set, undefined, "property descriptor is not a setter");

  assert_true(propDesc.enumerable, "property descriptor enumerable");

  assert_true(propDesc.configurable, "property descriptor configurable");

}, "message property descriptor");

test(() => {

  const getter = Object.getOwnPropertyDescriptor(DOMException.prototype, "message").get;

  assert_throws_js(TypeError, () => getter.apply({}));

}, "message getter performs brand checks (i.e. is not [LegacyLenientThis])");

test(() => {

  const e = new DOMException("message", "name");

  assert_false(e.hasOwnProperty("name"), "property is not own");

  const propDesc = Object.getOwnPropertyDescriptor(DOMException.prototype, "name");

  assert_equals(typeof propDesc.get, "function", "property descriptor is a getter");

  assert_equals(propDesc.set, undefined, "property descriptor is not a setter");

  assert_true(propDesc.enumerable, "property descriptor enumerable");

  assert_true(propDesc.configurable, "property descriptor configurable");

}, "name property descriptor");

test(() => {

  const getter = Object.getOwnPropertyDescriptor(DOMException.prototype, "name").get;

  assert_throws_js(TypeError, () => getter.apply({}));

}, "name getter performs brand checks (i.e. is not [LegacyLenientThis])");

test(() => {

  const e = new DOMException("message", "name");

  assert_false(e.hasOwnProperty("code"), "property is not own");

  const propDesc = Object.getOwnPropertyDescriptor(DOMException.prototype, "code");

  assert_equals(typeof propDesc.get, "function", "property descriptor is a getter");

  assert_equals(propDesc.set, undefined, "property descriptor is not a setter");

  assert_true(propDesc.enumerable, "property descriptor enumerable");

  assert_true(propDesc.configurable, "property descriptor configurable");

}, "code property descriptor");

test(() => {

  const getter = Object.getOwnPropertyDescriptor(DOMException.prototype, "code").get;

  assert_throws_js(TypeError, () => getter.apply({}));

}, "code getter performs brand checks (i.e. is not [LegacyLenientThis])");

test(() => {

  const e = new DOMException("message", "InvalidCharacterError");

  assert_equals(e.code, 5, "Initially the code is set to 5");

  Object.defineProperty(e, "name", {

    value: "WrongDocumentError"

});

  assert_equals(e.code, 5, "The code is still set to 5");

}, "code property is not affected by shadowing the name property");

test(() => {

  const e = new DOMException("message", "name");

  assert_equals(Object.prototype.toString.call(e), "[object DOMException]");

}, "Object.prototype.toString behavior is like other interfaces");

test(() => {

  const e = new DOMException("message", "name");

  assert_false(e.hasOwnProperty("toString"), "toString must not exist on the instance");

  assert_false(DOMException.prototype.hasOwnProperty("toString"), "toString must not exist on DOMException.prototype");

  assert_equals(typeof e.toString, "function", "toString must still exist (via Error.prototype)");

}, "Inherits its toString() from Error.prototype");

test(() => {

  const e = new DOMException("message", "name");

  assert_equals(e.toString(), "name: message",

    "The default Error.prototype.toString() behavior must work on supplied name and message");

  Object.defineProperty(e, "name", { value: "new name" });

  Object.defineProperty(e, "message", { value: "new message" });

  assert_equals(e.toString(), "new name: new message",

    "The default Error.prototype.toString() behavior must work on shadowed names and messages");

}, "toString() behavior from Error.prototype applies as expected");

test(() => {

  assert_throws_js(TypeError, () => DOMException.prototype.toString());

}, "DOMException.prototype.toString() applied to DOMException.prototype throws because of name/message brand checks");

test(() => {

  let stackOnNormalErrors;

  try {

    throw new Error("normal error");

  } catch (e) {

    stackOnNormalErrors = e.stack;

  let stackOnDOMException;

  try {

    throw new DOMException("message", "name");

  } catch (e) {

    stackOnDOMException = e.stack;

  assert_equals(typeof stackOnDOMException, typeof stackOnNormalErrors, "The typeof values must match");

}, "If the implementation has a stack property on normal errors, it also does on DOMExceptions");