Testing with the Repository Pattern

Overview

Another approach to testing EF Core applications is to use the repository pattern. The repository pattern is a strategy for abstracting the data access layer, which is the portion of code responsible for storing and retrieving data.

Functionally, a repository encloses the set of objects persisted in a data store and operations performed over them. It provides a more object-oriented view of the persistence layer. Some of the benefits of this include:

• Less duplication of logic: It ensures all data access code is concentrated in one place rather than scattered across the application.

• Loose coupling to the underlying persistence technology: It makes it easier to switch from one database technology to another if the need arises.

• Tests focus more on application code: We mock the repository abstraction removing EF Core from the testing stack altogether.

We’ll demonstrate testing with the repository pattern using the C# ...