try:
     driver_option = request.config.option.drivers[0]
-except (AttributeError, TypeError):
+except (AttributeError, TypeError, IndexError):
     raise Exception("This test requires a --driver to be specified")

 def test_remote_webdriver_with_http_timeout(firefox_options, webserver):
     """This test starts a remote webdriver with an http client timeout
     set less than the implicit wait timeout, and verifies the http timeout
     is triggered first when waiting for an element.
     """
     http_timeout = 6
     wait_timeout = 8
     server_addr = f"http://{webserver.host}:{webserver.port}"
     client_config = ClientConfig(remote_server_addr=server_addr, timeout=http_timeout)
     assert client_config.timeout == http_timeout
     with webdriver.Remote(options=firefox_options, client_config=client_config) as driver:
         driver.get(f"{server_addr}/simpleTest.html")
         driver.implicitly_wait(wait_timeout)
+        start_time = time.time()
         with pytest.raises(ReadTimeoutError):
             driver.find_element(By.ID, "no_element_to_be_found")
+        elapsed_time = time.time() - start_time
+        # Verify timeout occurred closer to http_timeout than wait_timeout
+        assert elapsed_time < wait_timeout, f"Test took {elapsed_time}s, expected < {wait_timeout}s"

 try:
     driver_option = request.config.option.drivers[0]
 except (AttributeError, TypeError):
-    raise Exception("This test requires a --driver to be specified")
+    raise Exception("This test requires a --driver option to be specified. Use '--driver=firefox' or another supported driver name when running the test.")