Comment by JanisErdmanis
5 hours ago
It’s about coupling and being able to maintain that in the long term. A narrow focus helps to test each individual unit in isolation from each other. It is true that a database appears to be a single datastructure with hundreds of methods from the users perspective and that is fine, because someone else engineered and tested it for you. However if you were to look into how a database is implemented you would get to see the composition of data structures, like btrees that are tested in isolation.
It’s about coupling and being able to maintain that in the long term.
What does that mean? This is all the kind of abstract programming advice that sounds nice until someone needs an example.
A narrow focus helps to test each individual unit in isolation from each other.
A function operating on a data structure is already a narrow focus.
It is true that a database appears to be a single datastructure with hundreds of methods from the users perspective
And also from a reality perspective because it's literally what a database is about.
However if you were to look into how a database is implemented you would get to see the composition of data structures, like btrees that are tested in isolation.
I don't know what point you're trying to make. Data structures should be tested? I don't think anyone is saying they shouldn't.