Added unit tests.

src/Volo.Abp.Identity.Application.Contracts/Volo/Abp/Identity/IIdentityUserAppService.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Threading.Tasks;
 using Volo.Abp.Application.Dtos;
 using Volo.Abp.Application.Services;
 
@@ -6,6 +7,6 @@ namespace Volo.Abp.Identity
 {
     public interface IIdentityUserAppService : IAsyncCrudAppService<IdentityUserDto, Guid, PagedAndSortedResultRequestDto, IdentityUserCreateDto, IdentityUserUpdateDto>
     {
-        
+
     }
 }

src/Volo.Abp.Identity.Application.Contracts/Volo/Abp/Identity/IdentityUserCreateOrUpdateDto.cs

@@ -1,4 +1,6 @@
-namespace Volo.Abp.Identity
+using JetBrains.Annotations;
+
+namespace Volo.Abp.Identity
 {
     public abstract class IdentityUserCreateOrUpdateDtoBase
     {
@@ -11,5 +13,8 @@
         public bool TwoFactorEnabled { get; set; } //TODO: Optional?
 
         public bool LockoutEnabled { get; set; } //TODO: Optional?
+
+        [CanBeNull]
+        public string[] Roles { get; set; }
     }
 }

src/Volo.Abp.Identity.Application.Contracts/Volo/Abp/Identity/IdentityUserRoleInfoDto.cs

@@ -0,0 +1,9 @@
+using Volo.Abp.Application.Dtos;
+
+namespace Volo.Abp.Identity
+{
+    public class IdentityUserRoleInfoDto : EntityDto
+    {
+        public string Name { get; set; }
+    }
+}

src/Volo.Abp.Identity.Application/Volo/Abp/Identity/IdentityUserAppService.cs

@@ -28,19 +28,20 @@ namespace Volo.Abp.Identity
 
         public async Task<PagedResultDto<IdentityUserDto>> GetListAsync(PagedAndSortedResultRequestDto input)
         {
-            var userCount = (int) await _userRepository.GetCountAsync();
-            var userDtos = ObjectMapper.Map<List<IdentityUser>, List<IdentityUserDto>>(
-                await _userRepository.GetListAsync(input.Sorting, input.MaxResultCount, input.SkipCount)
-            );
+            var userCount = (int)await _userRepository.GetCountAsync();
+            var users = await _userRepository.GetListAsync(input.Sorting, input.MaxResultCount, input.SkipCount);
 
-            return new PagedResultDto<IdentityUserDto>(userCount, userDtos);
+            return new PagedResultDto<IdentityUserDto>(
+                userCount,
+                ObjectMapper.Map<List<IdentityUser>, List<IdentityUserDto>>(users)
+            );
         }
 
         public async Task<IdentityUserDto> CreateAsync(IdentityUserCreateDto input)
         {
             var user = new IdentityUser(GuidGenerator.Create(), input.UserName);
 
-            await UpdateUserProperties(input, user);
+            await UpdateUserByInput(user, input);
             await _userManager.AddPasswordAsync(user, input.Password);
             await _userManager.CreateAsync(user);
             await CurrentUnitOfWork.SaveChangesAsync();
@@ -53,7 +54,7 @@ namespace Volo.Abp.Identity
             var user = await _userManager.GetByIdAsync(id);
 
             await _userManager.SetUserNameAsync(user, input.UserName);
-            await UpdateUserProperties(input, user);
+            await UpdateUserByInput(user, input);
             await _userManager.UpdateAsync(user);
             await CurrentUnitOfWork.SaveChangesAsync();
 
@@ -66,12 +67,17 @@ namespace Volo.Abp.Identity
             await _userManager.DeleteAsync(user);
         }
 
-        private async Task UpdateUserProperties(IdentityUserCreateOrUpdateDtoBase input, IdentityUser user)
+        private async Task UpdateUserByInput(IdentityUser user, IdentityUserCreateOrUpdateDtoBase input)
         {
             await _userManager.SetEmailAsync(user, input.Email);
             await _userManager.SetPhoneNumberAsync(user, input.PhoneNumber);
             await _userManager.SetTwoFactorEnabledAsync(user, input.TwoFactorEnabled);
             await _userManager.SetLockoutEnabledAsync(user, input.LockoutEnabled);
+
+            if (input.Roles != null)
+            {
+                await _userManager.SetRolesAsync(user, input.Roles);
+            }
         }
     }
 }

src/Volo.Abp.Identity.EntityFrameworkCore/Volo/Abp/Identity/EfCoreIdentityUserRepository.cs

@@ -14,7 +14,7 @@ namespace Volo.Abp.Identity
 {
     public class EfCoreIdentityUserRepository : EfCoreRepository<IdentityDbContext, IdentityUser>, IIdentityUserRepository
     {
-        public EfCoreIdentityUserRepository(IDbContextProvider<IdentityDbContext> dbContextProvider) 
+        public EfCoreIdentityUserRepository(IDbContextProvider<IdentityDbContext> dbContextProvider)
             : base(dbContextProvider)
         {
         }
@@ -71,16 +71,16 @@ namespace Volo.Abp.Identity
             }
 
             var query = from userrole in DbContext.UserRoles
-                join user in DbContext.Users on userrole.UserId equals user.Id
-                where userrole.RoleId.Equals(role.Id)
-                select user;
+                        join user in DbContext.Users on userrole.UserId equals user.Id
+                        where userrole.RoleId.Equals(role.Id)
+                        select user;
 
             return await query.ToListAsync(cancellationToken);
         }
 
         public async Task<List<IdentityUser>> GetListAsync(string sorting, int maxResultCount, int skipCount)
         {
-            return await this.OrderBy(sorting ?? "UserName").PageBy(skipCount, maxResultCount).ToListAsync();
+            return await this.OrderBy(sorting ?? nameof(IdentityUser.UserName)).PageBy(skipCount, maxResultCount).ToListAsync();
         }
     }
 }

src/Volo.Abp.Identity/Volo/Abp/Identity/IdentityRole.cs

@@ -52,6 +52,7 @@ namespace Volo.Abp.Identity
 
             Id = id;
             Name = name;
+            NormalizedName = name.ToUpperInvariant();
             ConcurrencyStamp = Guid.NewGuid().ToString();
 
             Claims = new Collection<IdentityRoleClaim>();

src/Volo.Abp.Identity/Volo/Abp/Identity/IdentityUser.cs

@@ -101,8 +101,7 @@ namespace Volo.Abp.Identity
         /// <summary>
         /// Navigation property for the roles this user belongs to.
         /// </summary>
-        public virtual IReadOnlyList<IdentityUserRole> Roles => RolesCollection;
-        protected virtual List<IdentityUserRole> RolesCollection { get; set; }
+        public virtual ICollection<IdentityUserRole> Roles { get; protected set; }
 
         /// <summary>
         /// Navigation property for the claims this user possesses.
@@ -130,9 +129,10 @@ namespace Volo.Abp.Identity
 
             Id = id;
             UserName = userName;
+            NormalizedUserName = userName.ToUpperInvariant();
             ConcurrencyStamp = Guid.NewGuid().ToString();
 
-            RolesCollection = new List<IdentityUserRole>();
+            Roles = new Collection<IdentityUserRole>();
             Claims = new Collection<IdentityUserClaim>();
             Logins = new Collection<IdentityUserLogin>();
             Tokens = new Collection<IdentityUserToken>();
@@ -147,7 +147,7 @@ namespace Volo.Abp.Identity
                 return;
             }
 
-            RolesCollection.Add(new IdentityUserRole(guidGenerator.Create(), Id, roleId));
+            Roles.Add(new IdentityUserRole(guidGenerator.Create(), Id, roleId));
         }
 
         public void RemoveRole(Guid roleId)
@@ -159,7 +159,7 @@ namespace Volo.Abp.Identity
                 return;
             }
 
-            RolesCollection.RemoveAll(r => r.RoleId == roleId);
+            Roles.RemoveAll(r => r.RoleId == roleId);
         }
 
         public bool IsInRole(Guid roleId)

src/Volo.Abp.Identity/Volo/Abp/Identity/IdentityUserManager.cs

@@ -1,6 +1,8 @@
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using System.Threading.Tasks;
+using JetBrains.Annotations;
 using Microsoft.AspNetCore.Identity;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;
@@ -21,14 +23,14 @@ namespace Volo.Abp.Identity
             IServiceProvider services,
             ILogger<IdentityUserManager> logger)
             : base(
-                  store, 
-                  optionsAccessor, 
-                  passwordHasher, 
-                  userValidators, 
-                  passwordValidators, 
-                  keyNormalizer, 
-                  errors, 
-                  services, 
+                  store,
+                  optionsAccessor,
+                  passwordHasher,
+                  userValidators,
+                  passwordValidators,
+                  keyNormalizer,
+                  errors,
+                  services,
                   logger)
         {
 
@@ -44,5 +46,16 @@ namespace Volo.Abp.Identity
 
             return user;
         }
+
+        public async Task SetRolesAsync([NotNull] IdentityUser user, [NotNull] string[] roleNames)
+        {
+            Check.NotNull(user, nameof(user));
+            Check.NotNull(roleNames, nameof(roleNames));
+
+            var currentRoleNames = await GetRolesAsync(user);
+
+            await RemoveFromRolesAsync(user, currentRoleNames.Except(roleNames));
+            await AddToRolesAsync(user, roleNames.Except(currentRoleNames));
+        }
     }
 }

test/Volo.Abp.Identity.Application.Tests/Volo/Abp/Identity/AbpIdentityTestDataBuilder.cs

@@ -7,16 +7,32 @@ namespace Volo.Abp.Identity
     {
         private readonly IGuidGenerator _guidGenerator;
         private readonly IIdentityUserRepository _userRepository;
+        private readonly IIdentityRoleRepository _roleRepository;
 
         public AbpIdentityTestDataBuilder(
             IGuidGenerator guidGenerator,
-            IIdentityUserRepository userRepository)
+            IIdentityUserRepository userRepository,
+            IIdentityRoleRepository roleRepository)
         {
             _guidGenerator = guidGenerator;
             _userRepository = userRepository;
+            _roleRepository = roleRepository;
         }
 
         public void Build()
+        {
+            AddRoles();
+            AddUsers();
+        }
+
+        private void AddRoles()
+        {
+            _roleRepository.Insert(new IdentityRole(_guidGenerator.Create(), "admin"));
+            _roleRepository.Insert(new IdentityRole(_guidGenerator.Create(), "moderator"));
+            _roleRepository.Insert(new IdentityRole(_guidGenerator.Create(), "supporter"));
+        }
+
+        private void AddUsers()
         {
             _userRepository.Insert(new IdentityUser(_guidGenerator.Create(), "john.nash"));
         }

test/Volo.Abp.Identity.Application.Tests/Volo/Abp/Identity/IdentityUserAppService_Tests.cs

@@ -20,10 +20,35 @@ namespace Volo.Abp.Identity
             _userRepository = ServiceProvider.GetRequiredService<IRepository<IdentityUser>>();
         }
 
+        [Fact]
+        public async Task GetAsync()
+        {
+            //Arrange
+
+            var johnNash = await GetUserAsync("john.nash");
+
+            //Act
+
+            var result = await _identityUserAppService.GetAsync(johnNash.Id);
+
+            //Assert
+
+            result.Id.ShouldBe(johnNash.Id);
+            result.UserName.ShouldBe(johnNash.UserName);
+            result.Email.ShouldBe(johnNash.Email);
+            result.LockoutEnabled.ShouldBe(johnNash.LockoutEnabled);
+            result.PhoneNumber.ShouldBe(johnNash.PhoneNumber);
+        }
+
         [Fact]
         public async Task GetListAsync()
         {
+            //Act
+
             var result = await _identityUserAppService.GetListAsync(new PagedAndSortedResultRequestDto());
+
+            //Assert
+
             result.TotalCount.ShouldBeGreaterThan(0);
             result.Items.Count.ShouldBeGreaterThan(0);
         }
@@ -39,7 +64,8 @@ namespace Volo.Abp.Identity
                 Email = CreateRandomEmail(),
                 LockoutEnabled = true,
                 PhoneNumber = CreateRandomPhoneNumber(),
-                Password = "123qwe"
+                Password = "123qwe",
+                Roles = new[] {"moderator"}
             };
 
             //Act
@@ -78,7 +104,6 @@ namespace Volo.Abp.Identity
                 Email = CreateRandomEmail()
             };
 
-
             //Act
 
             var result = await _identityUserAppService.UpdateAsync(johnNash.Id, input);
@@ -99,11 +124,32 @@ namespace Volo.Abp.Identity
             user.PhoneNumber.ShouldBe(input.PhoneNumber);
         }
 
+        [Fact]
+        public async Task DeleteAsync()
+        {
+            //Arrange
+
+            var johnNash = await GetUserAsync("john.nash");
+
+            //Act
+
+            await _identityUserAppService.DeleteAsync(johnNash.Id);
+
+            //Assert
+
+            (await FindUserAsync("john.nash")).ShouldBeNull();
+        }
+
         private async Task<IdentityUser> GetUserAsync(string userName)
         {
             return (await _userRepository.GetListAsync()).First(u => u.UserName == userName);
         }
 
+        private async Task<IdentityUser> FindUserAsync(string userName)
+        {
+            return (await _userRepository.GetListAsync()).FirstOrDefault(u => u.UserName == userName);
+        }
+
         private static string CreateRandomEmail()
         {
             return Guid.NewGuid().ToString("N").Left(16) + "@abp.io";