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I have repository class that is used by at least 2 other classes. This repository class needs to be initialized – which is high in cost (querying database). Now, I create separate instances of repository wherever I need it. The thing is, that everytime I create repository it has to be initialized. How to design such repository to be TDD-friendly? The first thing in my mind was Singleton but it’s not the solution.
Do you use any type of IOC container? Unity is my container of choice, and it contains a ContainerControledLifetimeManager which makes your class a singleton, but not managed by yourself.