public async Task TestExtractLikedPostsByUsernameNonePosts()
        {
            var user = new ApplicationUser {
                Id = Guid.NewGuid().ToString(), UserName = "******"
            };
            var currentUser = new ApplicationUser {
                Id = Guid.NewGuid().ToString(), UserName = "******"
            };
            var post = new Post {
                Id = Guid.NewGuid().ToString(), ApplicationUser = user
            };
            var options = new DbContextOptionsBuilder <ApplicationDbContext>()
                          .UseInMemoryDatabase(databaseName: Guid.NewGuid().ToString()).Options;

            using (var db = new ApplicationDbContext(options))
            {
                IUserPostsService postService = new UserPostsService(db);
                db.Users.AddRange(user, currentUser);
                db.Posts.Add(post);
                db.PostsLikes.Add(new PostLike
                {
                    ApplicationUser = user,
                    Post            = post,
                    IsLiked         = false,
                });
                await db.SaveChangesAsync();

                var result = await postService.ExtractLikedPostsByUsername(user.UserName, currentUser);

                Assert.Equal(0, result.Count);
            }
        }
        public async Task TestExtractLikedPostsByUsernameNonePosts()
        {
            var mockUserManager = new Mock <UserManager <ApplicationUser> >(
                new Mock <IUserStore <ApplicationUser> >().Object,
                new Mock <IOptions <IdentityOptions> >().Object,
                new Mock <IPasswordHasher <ApplicationUser> >().Object,
                new IUserValidator <ApplicationUser> [0],
                new IPasswordValidator <ApplicationUser> [0],
                new Mock <ILookupNormalizer>().Object,
                new Mock <IdentityErrorDescriber>().Object,
                new Mock <IServiceProvider>().Object,
                new Mock <ILogger <UserManager <ApplicationUser> > >().Object);
            var user = new ApplicationUser {
                Id = Guid.NewGuid().ToString(), UserName = "******"
            };
            var currentUser = new ApplicationUser {
                Id = Guid.NewGuid().ToString(), UserName = "******"
            };
            var post = new Post {
                Id = Guid.NewGuid().ToString(), ApplicationUser = user
            };
            var options = new DbContextOptionsBuilder <ApplicationDbContext>()
                          .UseInMemoryDatabase(databaseName: Guid.NewGuid().ToString()).Options;

            using (var db = new ApplicationDbContext(options))
            {
                IUserPostsService postService = new UserPostsService(db, mockUserManager.Object);
                db.Users.AddRange(user, currentUser);
                db.Posts.Add(post);
                db.PostsLikes.Add(new PostLike
                {
                    ApplicationUser = user,
                    Post            = post,
                    IsLiked         = false,
                });
                await db.SaveChangesAsync();

                var result = await postService.ExtractLikedPostsByUsername(user.UserName, currentUser);

                Assert.Equal(0, result.Count);
            }
        }