Extensions for mocking Entity Framework Core (EFCore) operations such ToListAsync, FirstOrDefaultAsync etc. by Moq, NSubstitute or FakeItEasy When writing tests for your application it is often desirable to avoid hitting the database. The extensions allow you to achieve this by creating a context – with behavior defined by your tests – that makes use of in-memory data.
If you have something similar to the following code:
var query = _userRepository.GetQueryable();
await query.AnyAsync(x =>...)
await query.FirstOrDefaultAsync(x =>...)
query.CountAsync(x => ...)
query.ToListAsync()
//etc.and you want to cover it by unit tests
//1 - create a List<T> with test items
var users = new List<UserEntity>()
{
new UserEntity{LastName = "ExistLastName", DateOfBirth = DateTime.Parse("01/20/2012")},
...
};
//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);
//3 - setup the mock as Queryable for FakeItEasy
A.CallTo(() => userRepository.GetQueryable()).Returns(mock);Do you prefer DbSet?
//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 or FakeItEasy
var userRepository = new TestDbSetRepository(mock);Do you use DbQuery?
//2 - build mock by extension
var mock = users.AsQueryable().BuildMockDbQuery();
//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);
//3 - setup the mock as Queryable for FakeItEasy
A.CallTo(() => userRepository.GetQueryable()).Returns(mock);Check out the sample project
First, install NuGet.
If you are using Moq - then, install MockQueryable.Moq from the package manager console:
PM> Install-Package MockQueryable.Moq
If you are using NSubstitute - then, install MockQueryable.NSubstitute from the package manager console:
PM> Install-Package MockQueryable.NSubstitute
If you are using FakeItEasy - then, install MockQueryable.FakeItEasy from the package manager console:
PM> Install-Package MockQueryable.FakeItEasy
You can install MockQueryable.Core from the package manager console:
PM> Install-Package MockQueryable.Core
Then make own extension for your favorite mock framework
React
Typescript
Django
Laravel
Facebook
Microsoft
Google
Alibaba
D3
Tencent