http://developer.android.com/google/play/billing/billing_testing.html
The Google Play Developer Console provides several tools that help you test your In-app Billing implementation:
- Test purchases, which let license-test users purchase your published in-app items, without any actual charges to their accounts.
- Static billing responses from Google Play, for testing in early development
ここのコロンは具体例を上げるという意味合い。
参考