From 016db522017bfa268f26c4d4c0e9ae2050e74f80 Mon Sep 17 00:00:00 2001
From: Simon Pieters <zcorpan@gmail.com>
Date: Wed, 27 Apr 2022 09:20:26 +0200
Subject: [PATCH] DOM: Test document.createEvent('touchevent')

See https://github.com/whatwg/dom/pull/1071

Co-authored-by: Anne van Kesteren <annevk@annevk.nl>
---
 .../Document-createEvent-touchevent.window.js   | 12 ++++++++++++
 dom/nodes/Document-createEvent.https.html       | 17 +++++++++++++----
 2 files changed, 25 insertions(+), 4 deletions(-)
 create mode 100644 dom/nodes/Document-createEvent-touchevent.window.js

diff --git a/dom/nodes/Document-createEvent-touchevent.window.js b/dom/nodes/Document-createEvent-touchevent.window.js
new file mode 100644
index 000000000000000..6523ac5a023fc46
--- /dev/null
+++ b/dom/nodes/Document-createEvent-touchevent.window.js
@@ -0,0 +1,12 @@
+for (const variant of ['TouchEvent', 'touchevent', 'TOUCHEVENT']) {
+  test(() => {
+    if (!('ontouchstart' in document)) {
+      assert_throws_dom("NOT_SUPPORTED_ERR", () => {
+        document.createEvent(variant);
+      });
+    } else {
+      document.createEvent(variant);
+      // The interface and other details of the event is tested in Document-createEvent.https.html
+    }
+  }, `document.createEvent('${variant}') should throw if 'expose legacy touch event APIs' is false`);
+}
diff --git a/dom/nodes/Document-createEvent.https.html b/dom/nodes/Document-createEvent.https.html
index 8e948a37e68630e..f80c1c3672225da 100644
--- a/dom/nodes/Document-createEvent.https.html
+++ b/dom/nodes/Document-createEvent.https.html
@@ -7,13 +7,20 @@
 <script src="Document-createEvent.js"></script>
 <div id="log"></div>
 <script>
-function testAlias(arg, iface) {
+function supportsTouchEvents(isTouchEvent) {
+  if (isTouchEvent) {
+    assert_implements_optional('ontouchstart' in document, "'expose legacy touch event APIs'");
+  }
+}
+function testAlias(arg, iface, isTouchEvent) {
   var ev;
   test(function() {
+    supportsTouchEvents(isTouchEvent);
     ev = document.createEvent(arg);
     assert_equals(Object.getPrototypeOf(ev), window[iface].prototype);
   }, arg + " should be an alias for " + iface + ".");
   test(function() {
+    supportsTouchEvents(isTouchEvent);
     assert_equals(ev.type, "",
                   "type should be initialized to the empty string");
     assert_equals(ev.target, null,
@@ -32,11 +39,13 @@
                   "isTrusted should be initialized to false");
   }, "createEvent('" + arg + "') should be initialized correctly.");
 }
+aliases.TouchEvent = 'TouchEvent';
 for (var alias in aliases) {
+  var isTouchEvent = alias === 'TouchEvent';
   var iface = aliases[alias];
-  testAlias(alias, iface);
-  testAlias(alias.toLowerCase(), iface);
-  testAlias(alias.toUpperCase(), iface);
+  testAlias(alias, iface, isTouchEvent);
+  testAlias(alias.toLowerCase(), iface, isTouchEvent);
+  testAlias(alias.toUpperCase(), iface, isTouchEvent);
 
   if (alias[alias.length - 1] != "s") {
     var plural = alias + "s";