public void GetFollowersTest() { // act _userRepositoryMock.Setup(x => x.GetChildren(It.IsAny<User>())).Returns(new List<User> { new User(), new User() }); var userManager = new UserManager(_userRepositoryMock.Object); // actual var actual = userManager.GetFollowers(new User()); // assert Assert.AreEqual(actual.Count(), 2); }