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Switch to the latest (v5) version.
Sending a GET request to the home page should output the following message:
{"message": "Dotkernel API version 4"}
php -S 0.0.0.0:8080 -t public
The project has 2 types of tests: functional and unit tests, you can run both types at the same type by executing this command:
php vendor/bin/phpunit
vendor/bin/phpunit --testsuite=UnitTests --testdox --colors=always
vendor/bin/phpunit --testsuite=FunctionalTests --testdox --colors=always