Update CI (#146)

* Update CI to really run tests
* Fix missing environment variables in tests

Author: molikuner

.circleci/config.yml

@@ -39,5 +39,5 @@ jobs:
           key: v1-dependencies-{{ checksum "build.gradle.kts" }}
 
       # run tests!
-      - run: gradle test -PclientId=$SPOTIFY_CLIENT_ID -PclientSecret=$SPOTIFY_CLIENT_SECRET
+      - run: gradle check -DclientId=$SPOTIFY_CLIENT_ID -DclientSecret=$SPOTIFY_CLIENT_SECRET