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test/fixtures/wpt/dom/events/non-cancelable-when-passive/resources/scrolling.js

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+function raf() {
+  return new Promise((resolve) => {
+    // rAF twice.
+    window.requestAnimationFrame(() => {
+      window.requestAnimationFrame(resolve);
+    });
+  });
+}
+
+async function runTest({target, eventName, passive, expectCancelable}) {
+  await raf();
+
+  let cancelable = null;
+  let arrived = false;
+  target.addEventListener(eventName, function (event) {
+    cancelable = event.cancelable;
+    arrived = true;
+  }, {passive:passive, once:true});
+
+  promise_test(async (t) => {
+    t.add_cleanup(() => {
+      document.querySelector('.remove-on-cleanup')?.remove();
+    });
+    const pos_x = Math.floor(window.innerWidth / 2);
+    const pos_y = Math.floor(window.innerHeight / 2);
+    const delta_x = 0;
+    const delta_y = 100;
+
+    await new test_driver.Actions()
+      .scroll(pos_x, pos_y, delta_x, delta_y).send();
+    await t.step_wait(() => arrived, `Didn't get event ${eventName} on ${target.localName}`);
+    assert_equals(cancelable, expectCancelable);
+  });
+}

test/fixtures/wpt/dom/events/non-cancelable-when-passive/resources/touching.js

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+function waitForCompositorCommit() {
+  return new Promise((resolve) => {
+    // rAF twice.
+    window.requestAnimationFrame(() => {
+      window.requestAnimationFrame(resolve);
+    });
+  });
+}
+
+function injectInput(touchDiv) {
+  return new test_driver.Actions()
+    .addPointer("touch_pointer", "touch")
+    .pointerMove(0, 0, {origin: touchDiv})
+    .pointerDown()
+    .pointerMove(30, 30)
+    .pointerUp()
+    .send();
+}
+
+function runTest({target, eventName, passive, expectCancelable}) {
+  let touchDiv = document.getElementById("touchDiv");
+  let cancelable = null;
+  let arrived = false;
+  target.addEventListener(eventName, function (event) {
+    cancelable = event.cancelable;
+    arrived = true;
+  }, {passive});
+  promise_test(async () => {
+    await waitForCompositorCommit();
+    await injectInput(touchDiv);
+    await waitFor(() => arrived);
+    assert_equals(cancelable, expectCancelable);
+  });
+}

test/fixtures/wpt/dom/events/non-cancelable-when-passive/resources/wait-for.js

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+function waitFor(condition, MAX_FRAME = 500) {
+  return new Promise((resolve, reject) => {
+    function tick(frames) {
+      // We requestAnimationFrame either for MAX_FRAME frames or until condition is
+      // met.
+      if (frames >= MAX_FRAME)
+        reject(new Error(`Condition did not become true after ${MAX_FRAME} frames`));
+      else if (condition())
+        resolve();
+      else
+        requestAnimationFrame(() => tick(frames + 1));
+    }
+    tick(0);
+  });
+}