To prepare the system tests (Selenium) to be run in your local machine you are asked to rename the file `tests/acceptance.suite.dist.yml` to `tests/acceptance.suite.yml`. Afterwards, please edit the file according to your system needs.
To run the tests please execute the following commands (for the moment only working in Linux and MacOS, for more information see: https://docs.joomla.org/Testing_Joomla_Extensions_with_Codeception):
Create a symbolic link from your tests\joomla-cms3 to a subfolder of your web server. For example, I'm creating a link between the tests folder of my weblinks folder and the tests folder of my web server: