We build for people. Physically testing each feature to make sure it works is best. Some parts of the project depend on others or are inter-linked. We encourage developers to test these groups as a whole if any one of them is changed.
We can store Gmail, X and telegram tokens currently. Gmail and X share the same authorization flow. If an update is made to any one of them then the other(s) need to be tested to make sure everything works as it should.