ensure you have postman installed or maybe Httpie or use curl (preferably postman (GUI))
every endpoint is aunthenticated therefore ensure that you put authentication tokens {key:value} pair of {'APP_KEY':'MUSTAPHA'} on the header of each request (use postman,it is just below the address bar)
for testcase
each test case is aunthenticated as well but no need to do anything manually during testing
cd into test directory
you can run Unit and Feature test respectively in each directory
for Unit testing :
./vendor/bin/phpunit tests/Unit/
for Feature testing
./vendor/bin/phpunit tests/Feature/
N.B we use Country table for REST API and Product table for Testing