Mocking EF core dbcontext and dbset

Question

I am using ASP.NET Core 2.2, EF Core and MOQ. When I run the test I am getting this error:

Message: System.NotSupportedException : Invalid setup on a

Answer 1

To save your time, try to use my Moq/NSubstitute extension MockQueryable: https://github.com/romantitov/MockQueryable supported all Sync/Async operations

//1 - create a List with test items
var users = new List()
{
 new UserEntity,
 ...
};

//2 - build mock by extension
var mock = users.AsQueryable().BuildMock();

//3 - setup the mock as Queryable for Moq
_userRepository.Setup(x => x.GetQueryable()).Returns(mock.Object);

//3 - setup the mock as Queryable for NSubstitute
_userRepository.GetQueryable().Returns(mock);

DbSet also supported

//2 - build mock by extension
var mock = users.AsQueryable().BuildMockDbSet();

//3 - setup DbSet for Moq
var userRepository = new TestDbSetRepository(mock.Object);

//3 - setup DbSet for NSubstitute
var userRepository = new TestDbSetRepository(mock);

Note:

• AutoMapper supported from 1.0.4 ver
• DbQuery supported from 1.1.0 ver
• EF Core 3.0 supported from 3.0.0 ver