$ php admin/tool/behat/cli/init.php
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Verifying lock file contents can be installed on current platform.
Nothing to install, update or remove
Package container-interop/container-interop is abandoned, you should avoid using it. Use psr/container instead.
Package phpunit/php-token-stream is abandoned, you should avoid using it. No replacement was suggested.
Generating autoload files
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In Selenium2Factory.php line 54:

  Install MinkSelenium2Driver in order to use selenium2 driver.


Error: Error running behat CLI command. Try running "vendor\bin\behat --help" manually from CLI to find out more about the problem.

Ensure you set $CFG->behat_* vars in config.php and you ran admin/tool/behat/cli/init.php.
More info in https://docs.moodle.org/dev/Running_acceptance_test