Dependency Injection: Forbid AI from Hardcoding Instantiation, Improve Testability and Extensibility

Fri, 07 Aug 2026 00:00:00 +0000

When AI writes code, it loves the “fastest way to make it run” approach, for example:

db = Database()
cache = RedisCache()
mailer = EmailService()
service = UserService()

Create wherever needed.

In the short term it’s convenient, but as the project grows larger, you end up with:

Database instances created everywhere
Cache clients created everywhere
Configuration scattered
Services instantiating each other
Dependencies impossible to replace during testing

The most obvious problem with this kind of code is:

Objects hardcode their own dependencies.

And DI (Dependency Injection) is exactly what solves this problem.

Dependency Injection on Interesting AI

Dependency Injection: Forbid AI from Hardcoding Instantiation, Improve Testability and Extensibility