c5fbe83809
Improve safaridriver launch sequence as follows: - Fix retry: the previous version would call `_startDriverProcess` recursively from within a listener to the stderr output. But by then the outer `_startDriverProcess` call would have completed its future, so the retry mechanism would kick in while tests are already running. - Wait for `safaridriver` server process to start listening and responding to WebDriver commands (using `/status` as the smoke test). - Smoke-test the driver session by attempting to list all windows (`WebDriver.windows`). - When `safaridriver` fails to pass all of the above checks, both close the session and kill the `safaridriver` process. Killing the process alone leaves Safari windows open. Closing the session alone leaves `safaridriver` processes open. - When tests are finished use `quit()` instead of `window.close()`, because the latter does not close the session.
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