Go Interfaces

When I started writing tests in Go, I sometimes used interfaces to mock things in tests. Then I discovered that this is not the correct way:

• Go Code Review Comments
• SOLID Go Design
• Accept Interfaces Return Struct in Go

Similar to github.com:karantan/go-concurrency, I decided to create (another) "lessons learned/good practices" repo that shows how to accepting interfaces and returning structs in practice.

Preemptive abstractions make systems complex.

I won't explain in detail why it's a bad practice to return interfaces because it's already been explained in the posts linked above. Please read them before going through the code here.

Additional resources:

• Learn Go with test-driven development
• Writing Good Unit Tests; Don’t Mock Database Connections