The document argues that unit test scopes should be larger rather than having many small unit test classes. Larger unit tests are better because they are less tightly coupled to code structure, can be more easily mapped to business requirements, and test interactions between classes rather than just individual classes. The document provides suggestions for how to structure unit tests at a bigger scope, such as using dependency injection frameworks, test data builders, and splitting tests across multiple classes when there are too many assertions. The overall message is that test scopes should be large enough to cover layers, external libraries, and controllers when possible rather than focusing exclusively on small individual classes.