Explain a situation where dependency injection could simplify the process of mocking external services in a Go application.
- By using global variables.
- By directly embedding services.
- By encapsulating services.
- By using concrete interfaces.
Dependency injection simplifies mocking external services in a Go application by encapsulating those services in interfaces and injecting them into the dependent code. This approach allows you to create mock implementations of those interfaces during testing. Without dependency injection, if external services were directly embedded or accessed through global variables, it would be challenging to substitute them with mocks. Dependency injection promotes abstraction and separation of concerns, making it easier to switch between real and mock implementations when interacting with external services.
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