test: add WPT tests for dom/events

PR-URL: nodejs/node#43151
Refs: nodejs/node#40678
Reviewed-By: Masashi Hirano <shisama07@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>

test/fixtures/wpt/README.md

@@ -13,6 +13,7 @@ Last update:
 - common: https://github.com/web-platform-tests/wpt/tree/03c5072aff/common
 - console: https://github.com/web-platform-tests/wpt/tree/3b1f72e99a/console
 - dom/abort: https://github.com/web-platform-tests/wpt/tree/c49cafb491/dom/abort
+- dom/events: https://github.com/web-platform-tests/wpt/tree/f8821adb28/dom/events
 - encoding: https://github.com/web-platform-tests/wpt/tree/35f70910d3/encoding
 - FileAPI: https://github.com/web-platform-tests/wpt/tree/3b279420d4/FileAPI
 - hr-time: https://github.com/web-platform-tests/wpt/tree/9910784394/hr-time

test/fixtures/wpt/dom/events/AddEventListenerOptions-once.any.js

@@ -0,0 +1,96 @@
+// META: title=AddEventListenerOptions.once
+
+"use strict";
+
+test(function() {
+  var invoked_once = false;
+  var invoked_normal = false;
+  function handler_once() {
+    invoked_once = true;
+  }
+  function handler_normal() {
+    invoked_normal = true;
+  }
+
+  const et = new EventTarget();
+  et.addEventListener('test', handler_once, {once: true});
+  et.addEventListener('test', handler_normal);
+  et.dispatchEvent(new Event('test'));
+  assert_equals(invoked_once, true, "Once handler should be invoked");
+  assert_equals(invoked_normal, true, "Normal handler should be invoked");
+
+  invoked_once = false;
+  invoked_normal = false;
+  et.dispatchEvent(new Event('test'));
+  assert_equals(invoked_once, false, "Once handler shouldn't be invoked again");
+  assert_equals(invoked_normal, true, "Normal handler should be invoked again");
+  et.removeEventListener('test', handler_normal);
+}, "Once listener should be invoked only once");
+
+test(function() {
+  const et = new EventTarget();
+  var invoked_count = 0;
+  function handler() {
+    invoked_count++;
+    if (invoked_count == 1)
+    et.dispatchEvent(new Event('test'));
+  }
+  et.addEventListener('test', handler, {once: true});
+  et.dispatchEvent(new Event('test'));
+  assert_equals(invoked_count, 1, "Once handler should only be invoked once");
+
+  invoked_count = 0;
+  function handler2() {
+    invoked_count++;
+    if (invoked_count == 1)
+      et.addEventListener('test', handler2, {once: true});
+    if (invoked_count <= 2)
+      et.dispatchEvent(new Event('test'));
+  }
+  et.addEventListener('test', handler2, {once: true});
+  et.dispatchEvent(new Event('test'));
+  assert_equals(invoked_count, 2, "Once handler should only be invoked once after each adding");
+}, "Once listener should be invoked only once even if the event is nested");
+
+test(function() {
+  var invoked_count = 0;
+  function handler() {
+    invoked_count++;
+  }
+
+  const et = new EventTarget();
+
+  et.addEventListener('test', handler, {once: true});
+  et.addEventListener('test', handler);
+  et.dispatchEvent(new Event('test'));
+  assert_equals(invoked_count, 1, "The handler should only be added once");
+
+  invoked_count = 0;
+  et.dispatchEvent(new Event('test'));
+  assert_equals(invoked_count, 0, "The handler was added as a once listener");
+
+  invoked_count = 0;
+  et.addEventListener('test', handler, {once: true});
+  et.removeEventListener('test', handler);
+  et.dispatchEvent(new Event('test'));
+  assert_equals(invoked_count, 0, "The handler should have been removed");
+}, "Once listener should be added / removed like normal listeners");
+
+test(function() {
+  const et = new EventTarget();
+
+  var invoked_count = 0;
+
+  for (let n = 4; n > 0; n--) {
+    et.addEventListener('test', (e) => {
+      invoked_count++;
+      e.stopImmediatePropagation();
+    }, {once: true});
+  }
+
+  for (let n = 4; n > 0; n--) {
+    et.dispatchEvent(new Event('test'));
+  }
+
+  assert_equals(invoked_count, 4, "The listeners should be invoked");
+}, "Multiple once listeners should be invoked even if the stopImmediatePropagation is set");

test/fixtures/wpt/dom/events/AddEventListenerOptions-passive.any.js

@@ -0,0 +1,134 @@
+// META: title=AddEventListenerOptions.passive
+
+test(function() {
+  var supportsPassive = false;
+  var query_options = {
+    get passive() {
+      supportsPassive = true;
+      return false;
+    },
+    get dummy() {
+      assert_unreached("dummy value getter invoked");
+      return false;
+    }
+  };
+
+  const et = new EventTarget();
+  et.addEventListener('test_event', null, query_options);
+  assert_true(supportsPassive, "addEventListener doesn't support the passive option");
+
+  supportsPassive = false;
+  et.removeEventListener('test_event', null, query_options);
+  assert_false(supportsPassive, "removeEventListener supports the passive option when it should not");
+}, "Supports passive option on addEventListener only");
+
+function testPassiveValue(optionsValue, expectedDefaultPrevented, existingEventTarget) {
+  var defaultPrevented = undefined;
+  var handler = function handler(e) {
+    assert_false(e.defaultPrevented, "Event prematurely marked defaultPrevented");
+    e.preventDefault();
+    defaultPrevented = e.defaultPrevented;
+  }
+  const et = existingEventTarget || new EventTarget();
+  et.addEventListener('test', handler, optionsValue);
+  var uncanceled = et.dispatchEvent(new Event('test', {bubbles: true, cancelable: true}));
+
+  assert_equals(defaultPrevented, expectedDefaultPrevented, "Incorrect defaultPrevented for options: " + JSON.stringify(optionsValue));
+  assert_equals(uncanceled, !expectedDefaultPrevented, "Incorrect return value from dispatchEvent");
+
+  et.removeEventListener('test', handler, optionsValue);
+}
+
+test(function() {
+  testPassiveValue(undefined, true);
+  testPassiveValue({}, true);
+  testPassiveValue({passive: false}, true);
+  testPassiveValue({passive: true}, false);
+  testPassiveValue({passive: 0}, true);
+  testPassiveValue({passive: 1}, false);
+}, "preventDefault should be ignored if-and-only-if the passive option is true");
+
+function testPassiveValueOnReturnValue(test, optionsValue, expectedDefaultPrevented) {
+  var defaultPrevented = undefined;
+  var handler = test.step_func(e => {
+    assert_false(e.defaultPrevented, "Event prematurely marked defaultPrevented");
+    e.returnValue = false;
+    defaultPrevented = e.defaultPrevented;
+  });
+  const et = new EventTarget();
+  et.addEventListener('test', handler, optionsValue);
+  var uncanceled = et.dispatchEvent(new Event('test', {bubbles: true, cancelable: true}));
+
+  assert_equals(defaultPrevented, expectedDefaultPrevented, "Incorrect defaultPrevented for options: " + JSON.stringify(optionsValue));
+  assert_equals(uncanceled, !expectedDefaultPrevented, "Incorrect return value from dispatchEvent");
+
+  et.removeEventListener('test', handler, optionsValue);
+}
+
+async_test(t => {
+  testPassiveValueOnReturnValue(t, undefined, true);
+  testPassiveValueOnReturnValue(t, {}, true);
+  testPassiveValueOnReturnValue(t, {passive: false}, true);
+  testPassiveValueOnReturnValue(t, {passive: true}, false);
+  testPassiveValueOnReturnValue(t, {passive: 0}, true);
+  testPassiveValueOnReturnValue(t, {passive: 1}, false);
+  t.done();
+}, "returnValue should be ignored if-and-only-if the passive option is true");
+
+function testPassiveWithOtherHandlers(optionsValue, expectedDefaultPrevented) {
+  var handlerInvoked1 = false;
+  var dummyHandler1 = function() {
+    handlerInvoked1 = true;
+  };
+  var handlerInvoked2 = false;
+  var dummyHandler2 = function() {
+    handlerInvoked2 = true;
+  };
+
+  const et = new EventTarget();
+  et.addEventListener('test', dummyHandler1, {passive:true});
+  et.addEventListener('test', dummyHandler2);
+
+  testPassiveValue(optionsValue, expectedDefaultPrevented, et);
+
+  assert_true(handlerInvoked1, "Extra passive handler not invoked");
+  assert_true(handlerInvoked2, "Extra non-passive handler not invoked");
+
+  et.removeEventListener('test', dummyHandler1);
+  et.removeEventListener('test', dummyHandler2);
+}
+
+test(function() {
+  testPassiveWithOtherHandlers({}, true);
+  testPassiveWithOtherHandlers({passive: false}, true);
+  testPassiveWithOtherHandlers({passive: true}, false);
+}, "passive behavior of one listener should be unaffected by the presence of other listeners");
+
+function testOptionEquivalence(optionValue1, optionValue2, expectedEquality) {
+  var invocationCount = 0;
+  var handler = function handler(e) {
+    invocationCount++;
+  }
+  const et = new EventTarget();
+  et.addEventListener('test', handler, optionValue1);
+  et.addEventListener('test', handler, optionValue2);
+  et.dispatchEvent(new Event('test', {bubbles: true}));
+  assert_equals(invocationCount, expectedEquality ? 1 : 2, "equivalence of options " +
+    JSON.stringify(optionValue1) + " and " + JSON.stringify(optionValue2));
+  et.removeEventListener('test', handler, optionValue1);
+  et.removeEventListener('test', handler, optionValue2);
+}
+
+test(function() {
+  // Sanity check options that should be treated as distinct handlers
+  testOptionEquivalence({capture:true}, {capture:false, passive:false}, false);
+  testOptionEquivalence({capture:true}, {passive:true}, false);
+
+  // Option values that should be treated as equivalent
+  testOptionEquivalence({}, {passive:false}, true);
+  testOptionEquivalence({passive:true}, {passive:false}, true);
+  testOptionEquivalence(undefined, {passive:true}, true);
+  testOptionEquivalence({capture: true, passive: false}, {capture: true, passive: true}, true);
+
+}, "Equivalence of option values");
+

test/fixtures/wpt/dom/events/AddEventListenerOptions-signal.any.js

@@ -0,0 +1,143 @@
+'use strict';
+
+test(function() {
+  let count = 0;
+  function handler() {
+    count++;
+  }
+  const et = new EventTarget();
+  const controller = new AbortController();
+  et.addEventListener('test', handler, { signal: controller.signal });
+  et.dispatchEvent(new Event('test'));
+  assert_equals(count, 1, "Adding a signal still adds a listener");
+  et.dispatchEvent(new Event('test'));
+  assert_equals(count, 2, "The listener was not added with the once flag");
+  controller.abort();
+  et.dispatchEvent(new Event('test'));
+  assert_equals(count, 2, "Aborting on the controller removes the listener");
+  et.addEventListener('test', handler, { signal: controller.signal });
+  et.dispatchEvent(new Event('test'));
+  assert_equals(count, 2, "Passing an aborted signal never adds the handler");
+}, "Passing an AbortSignal to addEventListener options should allow removing a listener");
+
+test(function() {
+  let count = 0;
+  function handler() {
+    count++;
+  }
+  const et = new EventTarget();
+  const controller = new AbortController();
+  et.addEventListener('test', handler, { signal: controller.signal });
+  et.removeEventListener('test', handler);
+  et.dispatchEvent(new Event('test'));
+  assert_equals(count, 0, "The listener was still removed");
+}, "Passing an AbortSignal to addEventListener does not prevent removeEventListener");
+
+test(function() {
+  let count = 0;
+  function handler() {
+    count++;
+  }
+  const et = new EventTarget();
+  const controller = new AbortController();
+  et.addEventListener('test', handler, { signal: controller.signal, once: true });
+  controller.abort();
+  et.dispatchEvent(new Event('test'));
+  assert_equals(count, 0, "The listener was still removed");
+}, "Passing an AbortSignal to addEventListener works with the once flag");
+
+test(function() {
+  let count = 0;
+  function handler() {
+    count++;
+  }
+  const et = new EventTarget();
+  const controller = new AbortController();
+  et.addEventListener('test', handler, { signal: controller.signal, once: true });
+  et.removeEventListener('test', handler);
+  et.dispatchEvent(new Event('test'));
+  assert_equals(count, 0, "The listener was still removed");
+}, "Removing a once listener works with a passed signal");
+
+test(function() {
+  let count = 0;
+  function handler() {
+    count++;
+  }
+  const et = new EventTarget();
+  const controller = new AbortController();
+  et.addEventListener('first', handler, { signal: controller.signal, once: true });
+  et.addEventListener('second', handler, { signal: controller.signal, once: true });
+  controller.abort();
+  et.dispatchEvent(new Event('first'));
+  et.dispatchEvent(new Event('second'));
+  assert_equals(count, 0, "The listener was still removed");
+}, "Passing an AbortSignal to multiple listeners");
+
+test(function() {
+  let count = 0;
+  function handler() {
+    count++;
+  }
+  const et = new EventTarget();
+  const controller = new AbortController();
+  et.addEventListener('test', handler, { signal: controller.signal, capture: true });
+  controller.abort();
+  et.dispatchEvent(new Event('test'));
+  assert_equals(count, 0, "The listener was still removed");
+}, "Passing an AbortSignal to addEventListener works with the capture flag");
+
+test(function() {
+  let count = 0;
+  function handler() {
+    count++;
+  }
+  const et = new EventTarget();
+  const controller = new AbortController();
+  et.addEventListener('test', () => {
+    controller.abort();
+  }, { signal: controller.signal });
+  et.addEventListener('test', handler, { signal: controller.signal });
+  et.dispatchEvent(new Event('test'));
+  assert_equals(count, 0, "The listener was still removed");
+}, "Aborting from a listener does not call future listeners");
+
+test(function() {
+  let count = 0;
+  function handler() {
+    count++;
+  }
+  const et = new EventTarget();
+  const controller = new AbortController();
+  et.addEventListener('test', () => {
+    et.addEventListener('test', handler, { signal: controller.signal });
+    controller.abort();
+  }, { signal: controller.signal });
+  et.dispatchEvent(new Event('test'));
+  assert_equals(count, 0, "The listener was still removed");
+}, "Adding then aborting a listener in another listener does not call it");
+
+test(function() {
+  const et = new EventTarget();
+  const ac = new AbortController();
+  let count = 0;
+  et.addEventListener('foo', () => {
+    et.addEventListener('foo', () => {
+      count++;
+      if (count > 5) ac.abort();
+      et.dispatchEvent(new Event('foo'));
+    }, { signal: ac.signal });
+    et.dispatchEvent(new Event('foo'));
+  }, { once: true });
+  et.dispatchEvent(new Event('foo'));
+}, "Aborting from a nested listener should remove it");
+
+test(function() {
+  const et = new EventTarget();
+  assert_throws_js(TypeError, () => { et.addEventListener("foo", () => {}, { signal: null }); });
+}, "Passing null as the signal should throw");
+
+test(function() {
+  const et = new EventTarget();
+  assert_throws_js(TypeError, () => { et.addEventListener("foo", null, { signal: null }); });
+}, "Passing null as the signal should throw (listener is also null)");