It is impossible to run test case in multiple browser simultaneously.
If yes, how can I config it
You can't directly at this moment. But there is workaround.
1. make test suite with your test case,
2. make test suite collection with your test suite. You can add your test suite to test suite collection AS MANY TIMES AS YOU WANT,
3. in collection's "execution information" just set that you want to execute your test suites in parallel mode. that's all.
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