public async Task Wall_GetWallMembers_Should_Return_View_Model() { var wallId = 0; IEnumerable <WallMemberDto> members = new List <WallMemberDto> { new WallMemberDto { Id = "1" }, new WallMemberDto { Id = "2" } }; _wallService.GetWallMembers(wallId, null).ReturnsForAnyArgs(Task.Run(() => members)); var response = await _wallController.GetWallMembers(wallId); Assert.IsInstanceOf <OkNegotiatedContentResult <IEnumerable <WallMemberViewModel> > >(response); }