Moqing Entity Framework 6 .Include() using DbSet<>

Question

I\'d like to give the background to this question. Skip if you like. For quite a while I\'ve paid close attention to the on going debates on stackoverflow and elsewhere rega

Answer 1

I managed to mock Include in Moq with a generic approach. Albeit this doesn't cover all usages of Include(), only with string and Expression, but it suited my needs:

public Mock> SetupMockSetFor(Expression>> selector) where T : class
    {
        var mock = new Mock>();

        mock.ResetCalls();

        this.EntitiesMock.Setup(m => m.Set()).Returns(mock.Object);
        this.EntitiesMock.Setup(selector).Returns(mock.Object);

        mock.Setup(x => x.Include(It.IsAny())).Returns(mock.Object);

        try
        {
            mock.Setup(x => x.Include(It.IsAny>>()))
                .Returns(mock.Object);
        }
        catch
        {
            // Include only applies to some objects, ignore where it doesn't work
        }

        return mock;
    }

test usage:

        var mockCourseSet = SetupMockSetFor(entities => entities.Courses);

In service method:

var foundCourses = dbContext.Courses.Include(c => c.CourseParticipants).Where(c => c.Id = courseId)