Prepare:

• set up ADC
• download a service account key (or provide one on drive? for folks to share in testing)

Tests on credentials

1. run SpringAutoconfTestApplication.java.
2. in a terminal, call curl http://localhost:8080/language and observe output. shows similar to:

 c.e.s.SpringAutoconfTestApplication      : Default credentials provider for user xxxxxx.apps.googleusercontent.com
 c.e.s.SpringAutoconfTestApplication      : user credential ProjectId: [your-default-application-credentials-project-id]

3. uncomment/set spring.cloud.gcp.credentials.location in application.properties
4. call curl http://localhost:8080/language again, this time log should print out the service account in use: c.e.s.SpringAutoconfTestApplication : Default credentials provider for service account xxxxx@xxxx.iam.gserviceaccount.com
5. test for a combination of global/service level credentials

Test on quotaProjectId

1. set com.google.cloud.language.v1.language-service.quotaProjectId in application.properties
2. run application
3. call curl http://localhost:8080/functions log prints : quotaProjectId set for Client library: null
4. call curl http://localhost:8080/language log prints : quotaProjectId set for Client library: [quota project id set in application.properties]