Moqing EF trows exception

I try to write unit test on face strange problem

 [TestMethod]
    public void Delete_user_save_via_context()
    {

        var data = new List<admins> 
        { 
            new admins() {id = 1,  login = "test" },

        }.AsQueryable();


        var mockSet = new Mock<DbSet<admins>>(data);
        mockSet.As<IQueryable<admins>>().Setup(x => x.Provider).Returns(data.Provider);
        mockSet.As<IQueryable<admins>>().Setup(x => x.Expression).Returns(data.Expression);
        mockSet.As<IQueryable<admins>>().Setup(x => x.ElementType).Returns(data.ElementType);
        mockSet.As<IQueryable<admins>>().Setup(x => x.GetEnumerator()).Returns(data.GetEnumerator);

        var mockContext = new Mock<Entities>();
        mockContext.Setup(x => x.admins).Returns(mockSet.Object);  //Here i have Exception


        var userService = new UserService(mockContext.Object);
        userService.Delete("test");

        mockSet.Verify(m => m.Remove(It.IsAny<admins>()),Times.Once);
        mockContext.Verify(m => m.SaveChanges(), Times.Once);

    }

This throws exception :

Castle.DynamicProxy.InvalidProxyConstructorArgumentsException: Can not instantiate proxy of class: Could not find a constructor that would match given arguments: System.Linq.EnumerableQuery`

Can somebody help with this ?