1 files changed, 37 insertions, 0 deletions
diff --git a/testing/web-platform/mozilla/tests/webdriver/classic/perform_actions/wheel.py b/testing/web-platform/mozilla/tests/webdriver/classic/perform_actions/wheel.py
new file mode 100644
index 0000000000..6ca328f33b
--- /dev/null
+++ b/testing/web-platform/mozilla/tests/webdriver/classic/perform_actions/wheel.py
@@ -0,0 +1,37 @@
+from copy import deepcopy
+
+import pytest
+from tests.classic.perform_actions.support.refine import get_events
+
+
+@pytest.mark.parametrize("device_pixel_ratio", ["1.0", "2.0", "0.5"])
+def test_scroll_delta_device_pixel(configuration, url, geckodriver, device_pixel_ratio):
+    config = deepcopy(configuration)
+
+    prefs = config["capabilities"]["moz:firefoxOptions"].get("prefs", {})
+    prefs.update({"layout.css.devPixelsPerPx": device_pixel_ratio})
+    config["capabilities"]["moz:firefoxOptions"]["prefs"] = prefs
+
+    try:
+        driver = geckodriver(config=config)
+        driver.new_session()
+
+        driver.session.url = url(
+            "/webdriver/tests/support/html/test_actions_scroll.html"
+        )
+
+        target = driver.session.find.css("#scrollable", all=False)
+
+        chain = driver.session.actions.sequence("wheel", "wheel_id")
+        chain.scroll(0, 0, 5, 10, origin=target).perform()
+
+        events = get_events(driver.session)
+        assert len(events) == 1
+        assert events[0]["type"] == "wheel"
+        assert events[0]["deltaX"] == 5
+        assert events[0]["deltaY"] == 10
+        assert events[0]["deltaZ"] == 0
+        assert events[0]["target"] == "scrollable-content"
+
+    finally:
+        driver.stop()