1 files changed, 71 insertions, 0 deletions
diff --git a/testing/web-platform/mozilla/tests/webdriver/classic/execute_async_script/execute_async.py b/testing/web-platform/mozilla/tests/webdriver/classic/execute_async_script/execute_async.py
new file mode 100644
index 0000000000..fe42e44ce7
--- /dev/null
+++ b/testing/web-platform/mozilla/tests/webdriver/classic/execute_async_script/execute_async.py
@@ -0,0 +1,71 @@
+import pytest
+from tests.support.asserts import assert_success
+from tests.support.sync import Poll
+from webdriver.error import NoSuchAlertException
+
+
+def execute_async_script(session, script, args=None):
+    if args is None:
+        args = []
+    body = {"script": script, "args": args}
+
+    return session.transport.send(
+        "POST", "/session/{session_id}/execute/async".format(**vars(session)), body
+    )
+
+
+@pytest.mark.parametrize("dialog_type", ["alert", "confirm", "prompt"])
+def test_no_abort_by_user_prompt_in_other_tab(session, inline, dialog_type):
+    original_handle = session.window_handle
+    original_handles = session.handles
+
+    session.url = inline(
+        """
+      <a onclick="window.open();">open window</a>
+      <script>
+        window.addEventListener("message", function (event) {{
+          {}("foo");
+        }});
+      </script>
+    """.format(
+            dialog_type
+        )
+    )
+
+    session.find.css("a", all=False).click()
+    wait = Poll(session, timeout=5, message="No new window has been opened")
+    new_handles = wait.until(lambda s: set(s.handles) - set(original_handles))
+    assert len(new_handles) == 1
+
+    session.window_handle = new_handles.pop()
+
+    response = execute_async_script(
+        session,
+        """
+        const resolve = arguments[0];
+
+        // Trigger opening a user prompt in the other window.
+        window.opener.postMessage("foo", "*");
+
+        // Delay resolving the Promise to ensure a user prompt has been opened.
+        setTimeout(() => resolve(42), 500);
+        """,
+    )
+
+    assert_success(response, 42)
+
+    session.window.close()
+
+    session.window_handle = original_handle
+
+    # Opening the alert in a different window is async here and can cause
+    # delays in slow builds like CCOV or TSAN.
+    wait = Poll(
+        session,
+        timeout=15,
+        ignored_exceptions=NoSuchAlertException,
+        message="No user prompt with text 'foo' detected",
+    )
+    wait.until(lambda s: s.alert.text == "foo")
+
+    session.alert.accept()