Moq with exact expression <Func <TEntity, bool >>

Question

I am trying to test the Get method in a repository. The signature is as follows:

public virtual IEnumerable<TEntity> Get(
        Expression<Func<TEntity, bool>> filter = null,
        Func<IQueryable<TEntity>, IOrderedQueryable<TEntity>> orderBy = null,
        string includeProperties = "")

This method is usually called as follows:

Department targetDepartment =
            _departmentRepository.Get(department => department.Id == departmentId).FirstOrDefault();

It works great with real data when I try to configure this method to return a specific “department” with a specific lambda where problems arise.

So far I have tried many ways to mock this, and here are some of them:

1)

Expression<Func<Department, bool>> filterExpression2 = d => d.Id == DepartmentId;

_departmentRepositoryMock.Setup(repo => repo.Get(
    It.Is<Expression<Func<Department, bool>>>(y => filterExpression2.Compile()(firstDepartment)),
    null, 
    It.IsAny<string>()))
                         .Returns(new List<Department>() { firstDepartment }.AsQueryable());

2)

Expression<Func<Department, bool>> filterExpression2 = d => d.Id == DepartmentId;

_departmentRepositoryMock.Setup(repo => repo.Get(
    It.IsAny<Expression<Func<Department, bool>>>(),
    null, 
    It.IsAny<string>()))
                         .Returns(new List<Department>() { firstDepartment }.Where(filterExpression2.Compile()).AsQueryable());

I have seen many similar questions, but for some reason none of them is useful.

What I'm trying to do is make the modified repository return a specific Department depending on the "Id" parameter sent to the lambda.

It.IsAny, , , , Get.

- ?

Answer 1

. .

[TestClass]
public class UnitTest11 {
    [TestMethod]
    public void TestMethod1() {
        //Arrange
        //fake data
        var list = Enumerable.Range(1, 10).Select(id => new Department { Id = id }).ToList();

        var mock = new Mock<IRepository<Department>>();

        mock
            .Setup(repo => repo.Get(
                It.IsAny<Expression<Func<Department, bool>>>(),
                null,
                It.IsAny<string>())
            )
            .Returns(
                (
                    Expression<Func<Department, bool>> filter,
                    Func<IQueryable<Department>, IOrderedQueryable<Department>> orderBy,
                    string includeProperties
                ) => {
                    var func = filter.Compile();
                    var result = list.Where(func);

                    if (orderBy != null) {
                        result = orderBy(result.AsQueryable());
                    }

                    return result;
                }
            );

        var sut = new MyClass(mock.Object);

        var departmentId = 2;

        //Act
        var actual = sut.GetDepartment(departmentId);

        //Assert
        Assert.IsNotNull(actual);
        Assert.AreEqual(actual, list[departmentId - 1]);

    }


    public class MyClass {
        private readonly IRepository<Department> _departmentRepository;

        public MyClass(IRepository<Department> repository) {
            this._departmentRepository = repository;
        }

        public Department GetDepartment(int departmentId) {
            Department targetDepartment = _departmentRepository.Get(department => department.Id == departmentId).FirstOrDefault();

            return targetDepartment;
        }
    }

    public class Department {
        public int Id { get; set; }
    }

    public interface IRepository<TEntity> {
        IEnumerable<TEntity> Get(
            Expression<Func<TEntity, bool>> filter = null,
            Func<IQueryable<TEntity>, IOrderedQueryable<TEntity>> orderBy = null,
            string includeProperties = ""
        );
    }
}