Shift-left is the battle cry of productivity today. Letting the developers be accountable for their quality is not new though. Shift left’s origins is in XP.
What are verification tests? They are time savers you need to write, apart from the regular tests. This post explains the need, and gives examples of tests.
We should be testing features, not isolated APIs. This post shows different ways to check the APIs work, and even more the features, by using different APIs