Bug 1540022 [wpt PR 16098] - [testdriver.js] Improve test coverage, a=testonly

Automatic update from web-platform-tests
[testdriver.js] Improve test coverage (#16098)

--

wpt-commits: ea8b7ff29a15265e3bf73364f49e22426a5b97d5
wpt-pr: 16098

testing/web-platform/tests/infrastructure/testdriver/actions/eventOrder.html

@@ -9,19 +9,20 @@
 
 <button id="a">Button a</button>
 <button id="b">Button b</button>
+<input id="text-input">
 
 <script>
 // Pointer 1 is added before Pointer 2 so it comes first in the list of sources
 // Therefore its actions happen first
 let events = [];
 
-async_test(t => {
+promise_test(() => {
   Array.prototype.forEach.call(document.getElementsByTagName("button"),
                                (x) => x.addEventListener("mousedown", () => {events.push(x.id)}));
 
   let button_a = document.getElementById("a");
   let button_b = document.getElementById("b");
-  let actions = new test_driver.Actions()
+  return new test_driver.Actions()
     .addPointer("pointer1")
     .addPointer("pointer2")
     .pointerMove(0, 0, {origin: button_a, sourceName: "pointer1"})
@@ -31,7 +32,30 @@ async_test(t => {
     .pointerUp({sourceName: "pointer2"})
     .pointerUp({sourceName: "pointer1"})
     .send()
-    .then(t.step_func_done(() => assert_array_equals(events, ["a", "b"])))
-    .catch(e => t.step_func(() => assert_unreached("Actions sequence failed " + e)));
+    .then(() => assert_array_equals(events, ["a", "b"]));
 });
+
+// This test uses a large number of keyboard sources to force race conditions
+// in implementations which incorrectly dispatch events. Despite belonging to
+// the same "tick," each action's initial event should be dispatched in series.
+promise_test(() => {
+  const input = document.getElementById("text-input");
+  const actions = new test_driver.Actions();
+  const code_for_a = "a".charCodeAt(0);
+  const keys = Array.from(Array(26))
+    .map((_, index) => ({
+      sourceName: "keyboard" + index,
+      code: String.fromCharCode(code_for_a + index)
+    }));
+
+  keys.forEach(({sourceName}) => actions.addKeyboard(sourceName));
+  keys.forEach(({code, sourceName}) => actions.keyDown(code, {sourceName}));
+  keys.forEach(({code, sourceName}) => actions.keyUp(code,{sourceName}));
+
+  return test_driver.click(input)
+    .then(() => actions.send())
+    .then(() => {
+      assert_equals(input.value, "abcdefghijklmnopqrstuvwxyz");
+    });
+}, "indivisible actions on the same track dispatch events in series");
 </script>