MichalJankowskii/Moq.EntityFrameworkCore

Library that provides methods that will help you with mocking EntityFrameworkCore.

Moq.EntityFrameworkCore

This library helps you mocking EntityFramework contexts. Now you will be able to test methods that are using DbSet<TEntity> or DbQuery<TEntity> from DbContext in an effective way.

Installation - NuGet Packages

Install-Package Moq.EntityFrameworkCore

Usage

For example we can assume that we have the following production code:

public class UsersContext : DbContext
{
    public virtual DbSet<User> Users { get; set; }
}

To mock Users and Roles you only need to implement the following 3 steps:

1. Create DbContext mock:

var userContextMock = new Mock<UsersContext>();

2. Generate your entities:

IList<User> users = ...;

3. Setup DbSet or DbQuery property:

userContextMock.Setup(x => x.Users).ReturnsDbSet(users);

or

userContextMock.SetupGet(x => x.Users).ReturnsDbSet(users);

or

userContextMock.SetupSequence(x => x.Set<User>())
  .ReturnsDbSet(new List<User>())
  .ReturnsDbSet(users);

And this is all. You can use your DbContext in your tests.

The second option is mocking DbSet that is part of the interface:

public interface IBlogContext
{
   DbSet<Post> Posts { get; }
}

And then use:

var posts = new List<Post>();
var contextMock = new Mock<IBlogContext>();
contextMock.Setup(p => p.Posts).ReturnsDbSet(posts);

You will find examples of this library in the repository.