diff --git a/webdriver/tests/classic/execute_async_script/promise.py b/webdriver/tests/classic/execute_async_script/promise.py
index d726d0d7128303..4f718cee683b9c 100644
--- a/webdriver/tests/classic/execute_async_script/promise.py
+++ b/webdriver/tests/classic/execute_async_script/promise.py
@@ -116,3 +116,29 @@ def test_promise_reject_timeout(session):
         resolve(promise);
         """)
     assert_error(response, "script timeout")
+
+
+def test_returned_promise_fulfilled_over_callback(session):
+    session.timeouts.script = 1
+    response = execute_async_script(session, """
+        let resolve = arguments[0];
+        setTimeout(() => resolve('callback'), 200);
+        return Promise.resolve('promise');
+        """)
+    assert_success(response, "promise")
+
+
+def test_returned_promise_rejected_over_callback(session):
+    session.timeouts.script = 1
+    response = execute_async_script(session, """
+        return Promise.reject(new Error('my error'));
+        """)
+    assert_error(response, "javascript error")
+
+
+def test_returned_poisoned_thenable(session):
+    session.timeouts.script = .1
+    response = execute_async_script(session, """
+        return { get then() { thow new Error('my error'); } };
+        """)
+    assert_error(response, "javascript error")
diff --git a/webdriver/tests/classic/execute_script/promise.py b/webdriver/tests/classic/execute_script/promise.py
index c206674baefc75..fc9027e8595018 100644
--- a/webdriver/tests/classic/execute_script/promise.py
+++ b/webdriver/tests/classic/execute_script/promise.py
@@ -100,3 +100,11 @@ def test_promise_reject_timeout(session):
         );
         """)
     assert_error(response, "script timeout")
+
+
+def test_returned_poisoned_thenable(session):
+    session.timeouts.script = .1
+    response = execute_script(session, """
+        return { get then() { thow new Error('my error'); } };
+        """)
+    assert_error(response, "javascript error")