add(test)：添加单元测试

backend/IMTest/IMTest.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+
+    <IsPackable>false</IsPackable>
+    <IsTestProject>true</IsTestProject>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="coverlet.collector" Version="6.0.0" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.InMemory" Version="8.0.22" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
+    <PackageReference Include="Moq" Version="4.20.72" />
+    <PackageReference Include="xunit" Version="2.5.3" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.3" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\IM_API\IM_API.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Using Include="Xunit" />
+  </ItemGroup>
+
+</Project>

backend/IMTest/Service/AuthServiceTest.cs

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+using Xunit;
+using Microsoft.EntityFrameworkCore;
+using Moq;
+using AutoMapper;
+using IM_API.Services;
+using IM_API.Models;
+using IM_API.Dtos;
+using IM_API.Exceptions;
+using IM_API.Tools;
+using Microsoft.Extensions.Logging;
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+
+public class AuthServiceTests
+{
+    // ---------- 辅助：创建独立的 InMemory DbContext ----------
+    private ImContext CreateDbContext()
+    {
+        var options = new DbContextOptionsBuilder<ImContext>()
+            .UseInMemoryDatabase(Guid.NewGuid().ToString())
+            .Options;
+
+        var context = new ImContext(options);
+        return context;
+    }
+
+    // ---------- 可用于模拟 SaveChanges 抛异常的 DbContext ----------
+    private class ThrowOnSaveImContext : ImContext
+    {
+        private readonly bool _throw;
+        public ThrowOnSaveImContext(DbContextOptions<ImContext> options, bool throwOnSave) : base(options)
+        {
+            _throw = throwOnSave;
+        }
+
+        public override Task<int> SaveChangesAsync(CancellationToken cancellationToken = default)
+        {
+            if (_throw) throw new InvalidOperationException("Simulated DB save error");
+            return base.SaveChangesAsync(cancellationToken);
+        }
+    }
+
+    // ---------- 默认 AutoMapper（简易映射配置） ----------
+    private IMapper CreateMapper()
+    {
+        var config = new MapperConfiguration(cfg =>
+        {
+            cfg.CreateMap<RegisterRequestDto, User>();
+            cfg.CreateMap<User, UserInfoDto>();
+        });
+        return config.CreateMapper();
+    }
+
+    // ---------- 创建 Service（允许注入自定义 mapper） ----------
+    private AuthService CreateService(ImContext context, IMapper mapper = null)
+    {
+        var loggerMock = new Mock<ILogger<AuthService>>();
+        var mapperToUse = mapper ?? CreateMapper();
+        return new AuthService(context, loggerMock.Object, mapperToUse);
+    }
+
+    // --------------------- 测试用例 ---------------------
+
+    [Fact]
+    public async Task LoginAsync_ShouldReturnUser_WhenValidCredentials()
+    {
+        var context = CreateDbContext();
+        context.Users.Add(new User { Id = 1, Username = "Tom", Password = "123456", NickName = "测试用户" });
+        await context.SaveChangesAsync();
+
+        var service = CreateService(context);
+
+        var result = await service.LoginAsync(new LoginRequestDto
+        {
+            Username = "Tom",
+            Password = "123456"
+        });
+
+        Assert.NotNull(result);
+        Assert.Equal(1, result.Id);
+        Assert.Equal("Tom", result.Username);
+    }
+
+    [Fact]
+    public async Task LoginAsync_ShouldThrowException_WhenInvalidCredentials()
+    {
+        var context = CreateDbContext();
+        var service = CreateService(context);
+
+        await Assert.ThrowsAsync<BaseException>(async () =>
+        {
+            await service.LoginAsync(new LoginRequestDto
+            {
+                Username = "NotExist",
+                Password = "wrong"
+            });
+        });
+    }
+
+    [Fact]
+    public async Task LoginAsync_IsCaseSensitive_ForUsername()
+    {
+        // 说明：当前实现是精确匹配 => 区分大小写
+        var context = CreateDbContext();
+        context.Users.Add(new User { Id = 10, Username = "Tom", Password = "p" });
+        await context.SaveChangesAsync();
+
+        var service = CreateService(context);
+
+        // 使用小写用户名应失败（表明当前逻辑区分大小写）
+        await Assert.ThrowsAsync<BaseException>(async () =>
+        {
+            await service.LoginAsync(new LoginRequestDto { Username = "tom", Password = "p" });
+        });
+    }
+
+    [Fact]
+    public async Task RegisterAsync_ShouldPersistUserAndReturnDto_WhenNewUser()
+    {
+        var context = CreateDbContext();
+        var service = CreateService(context);
+
+        var request = new RegisterRequestDto
+        {
+            Username = "Jerry",
+            Password = "123456"
+        };
+
+        var result = await service.RegisterAsync(request);
+
+        // 返回值正确
+        Assert.NotNull(result);
+        Assert.Equal("Jerry", result.Username);
+        Assert.True(result.Id > 0);
+
+        // DB 中确实存在该用户
+        var persisted = await context.Users.FirstOrDefaultAsync(u => u.Username == "Jerry");
+        Assert.NotNull(persisted);
+        Assert.Equal("Jerry", persisted.Username);
+    }
+
+    [Fact]
+    public async Task RegisterAsync_ShouldThrowException_WhenUserExists()
+    {
+        var context = CreateDbContext();
+        context.Users.Add(new User { Username = "Tom", Password = "12223" });
+        await context.SaveChangesAsync();
+
+        var service = CreateService(context);
+
+        var request = new RegisterRequestDto { Username = "Tom", Password = "123" };
+
+        await Assert.ThrowsAsync<BaseException>(() => service.RegisterAsync(request));
+    }
+
+    [Fact]
+    public async Task RegisterAsync_ShouldThrow_WhenMapperThrows()
+    {
+        var context = CreateDbContext();
+
+        var mapperMock = new Mock<IMapper>();
+        mapperMock.Setup(m => m.Map<User>(It.IsAny<RegisterRequestDto>()))
+                  .Throws(new Exception("mapper failure"));
+
+        var service = CreateService(context, mapperMock.Object);
+
+        var req = new RegisterRequestDto { Username = "A", Password = "B" };
+
+        var ex = await Assert.ThrowsAsync<Exception>(() => service.RegisterAsync(req));
+        Assert.Contains("mapper failure", ex.Message);
+    }
+
+    [Fact]
+    public async Task RegisterAsync_ShouldPropagateSaveException_WhenSaveFails()
+    {
+        var options = new DbContextOptionsBuilder<ImContext>()
+            .UseInMemoryDatabase(Guid.NewGuid().ToString())
+            .Options;
+
+        // 使用自定义上下文在 SaveChanges 时抛异常
+        var throwingContext = new ThrowOnSaveImContext(options, throwOnSave: true);
+
+        var service = CreateService(throwingContext);
+
+        var req = new RegisterRequestDto { Username = "X", Password = "P" };
+
+        var ex = await Assert.ThrowsAsync<InvalidOperationException>(() => service.RegisterAsync(req));
+        Assert.Contains("Simulated DB save error", ex.Message);
+    }
+
+    [Fact]
+    public async Task RegisterAsync_NullDto_ThrowsNullReferenceException_CurrentBehavior()
+    {
+        // 说明：当前实现没有对 dto 为 null 做检查，会触发 NullReferenceException。
+        // 建议：在生产代码中改为抛 ArgumentNullException 或者进行参数校验并返回明确错误。
+        var context = CreateDbContext();
+        var service = CreateService(context);
+
+        await Assert.ThrowsAsync<NullReferenceException>(async () =>
+        {
+            await service.RegisterAsync(null);
+        });
+    }
+}

backend/IMTest/Service/FriendServiceTest.cs

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+using Xunit;
+using Microsoft.EntityFrameworkCore;
+using Moq;
+using AutoMapper;
+using Microsoft.Extensions.Logging;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using System;
+using IM_API.Services;
+using IM_API.Models;
+using IM_API.Dtos;
+using IM_API.Exceptions;
+using IM_API.Tools;
+
+public class FriendServiceTests
+{
+    private ImContext CreateDbContext()
+    {
+        var options = new DbContextOptionsBuilder<ImContext>()
+            .UseInMemoryDatabase(Guid.NewGuid().ToString())
+            .Options;
+
+        return new ImContext(options);
+    }
+
+    private IMapper CreateMapper()
+    {
+        var config = new MapperConfiguration(cfg =>
+        {
+            cfg.CreateMap<Friend, FriendInfoDto>();
+            cfg.CreateMap<FriendRequestDto, FriendRequest>();
+            cfg.CreateMap<HandleFriendRequestDto, FriendRequest>();
+            cfg.CreateMap<FriendRequest, Friend>()
+                .ForMember(dest => dest.UserId, opt => opt.MapFrom(src => src.ResponseUser))
+                .ForMember(dest => dest.FriendId, opt => opt.MapFrom(src => src.RequestUser))
+                .ForMember(dest => dest.RemarkName, opt => opt.MapFrom(src => "AutoAdded"));
+        });
+
+        return config.CreateMapper();
+    }
+
+    private FriendService CreateService(ImContext context)
+    {
+        var logger = new Mock<ILogger<FriendService>>();
+        return new FriendService(context, logger.Object, CreateMapper());
+    }
+
+    // --------------------------- 测试 BlockFriendAsync ---------------------------
+    [Fact]
+    public async Task BlockFriendAsync_Should_Set_Status_To_Blocked()
+    {
+        var context = CreateDbContext();
+        context.Friends.Add(new Friend
+        {
+            Id = 1,
+            UserId = 10,
+            FriendId = 20,
+            StatusEnum = FriendStatus.Added,
+            RemarkName = "test remark"
+        });
+        await context.SaveChangesAsync();
+
+        var service = CreateService(context);
+
+        var result = await service.BlockeFriendAsync(1);
+
+        Assert.True(result);
+        Assert.Equal(FriendStatus.Blocked, context.Friends.Find(1).StatusEnum);
+    }
+
+    [Fact]
+    public async Task BlockFriendAsync_Should_Throw_When_NotFound()
+    {
+        var service = CreateService(CreateDbContext());
+
+        await Assert.ThrowsAsync<BaseException>(() => service.BlockeFriendAsync(99));
+    }
+
+    // --------------------------- 删除好友关系 ---------------------------
+    [Fact]
+    public async Task DeleteFriendAsync_Should_Remove_Friend()
+    {
+        var context = CreateDbContext();
+        context.Friends.Add(new Friend
+        {
+            Id = 2,
+            UserId = 1,
+            FriendId = 3,
+            RemarkName = "remark",
+            StatusEnum = FriendStatus.Added
+        });
+        await context.SaveChangesAsync();
+
+        var service = CreateService(context);
+
+        var result = await service.DeleteFriendAsync(2);
+
+        Assert.True(result);
+        Assert.Empty(context.Friends);
+    }
+
+    // --------------------------- 获取好友列表 ---------------------------
+    [Fact]
+    public async Task GetFriendListAsync_Should_Return_Only_Added_Friends()
+    {
+        var context = CreateDbContext();
+        context.Friends.AddRange(new List<Friend>
+        {
+            new Friend{ UserId = 1, FriendId = 2, RemarkName ="a1", StatusEnum = FriendStatus.Added },
+            new Friend{ UserId = 1, FriendId = 3, RemarkName ="a2", StatusEnum = FriendStatus.Blocked }
+        });
+        await context.SaveChangesAsync();
+
+        var service = CreateService(context);
+
+        var result = await service.GetFriendListAsync(1, 1, 10, false);
+
+        Assert.Single(result);
+    }
+
+    // --------------------------- 发起好友请求 ---------------------------
+    [Fact]
+    public async Task SendFriendRequestAsync_Should_Succeed()
+    {
+        var context = CreateDbContext();
+        context.Users.Add(new User { Id = 10, Username = "A", Password = "123" });
+        context.Users.Add(new User { Id = 20, Username = "B", Password = "123" });
+        await context.SaveChangesAsync();
+
+        var service = CreateService(context);
+
+        var result = await service.SendFriendRequestAsync(new FriendRequestDto
+        {
+            FromUserId = 10,
+            ToUserId = 20
+        });
+
+        Assert.True(result);
+        Assert.Single(context.FriendRequests);
+        Assert.Single(context.Friends);
+    }
+
+    [Fact]
+    public async Task SendFriendRequestAsync_Should_Throw_When_User_NotFound()
+    {
+        var context = CreateDbContext();
+        context.Users.Add(new User { Id = 10, Username = "A", Password = "123" });
+        await context.SaveChangesAsync();
+
+        var service = CreateService(context);
+
+        await Assert.ThrowsAsync<BaseException>(() => service.SendFriendRequestAsync(new FriendRequestDto
+        {
+            FromUserId = 10,
+            ToUserId = 99
+        }));
+    }
+}

backend/IMTest/Service/UserServiceTest.cs

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+using Xunit;
+using Microsoft.EntityFrameworkCore;
+using Moq;
+using AutoMapper;
+using IM_API.Services;
+using IM_API.Models;
+using IM_API.Dtos;
+using IM_API.Exceptions;
+using IM_API.Tools;
+using Microsoft.Extensions.Logging;
+using System;
+using System.Threading.Tasks;
+
+public class UserServiceTests
+{
+    private ImContext CreateDbContext()
+    {
+        var options = new DbContextOptionsBuilder<ImContext>()
+            .UseInMemoryDatabase(Guid.NewGuid().ToString())
+            .Options;
+
+        return new ImContext(options);
+    }
+
+    private IMapper CreateMapper()
+    {
+        var config = new MapperConfiguration(cfg =>
+        {
+            cfg.CreateMap<User, UserInfoDto>();
+            cfg.CreateMap<UpdateUserDto, User>();
+        });
+        return config.CreateMapper();
+    }
+
+    private UserService CreateService(ImContext context)
+    {
+        var loggerMock = new Mock<ILogger<UserService>>();
+        var mapper = CreateMapper();
+        return new UserService(context, loggerMock.Object, mapper);
+    }
+
+    // ========== GetUserInfoAsync ==========
+    [Fact]
+    public async Task GetUserInfoAsync_ShouldReturnUser_WhenExists()
+    {
+        var context = CreateDbContext();
+        context.Users.Add(new User { Id = 1, Username = "Tom", Password = "123456" });
+        await context.SaveChangesAsync();
+
+        var service = CreateService(context);
+        var result = await service.GetUserInfoAsync(1);
+
+        Assert.NotNull(result);
+        Assert.Equal("Tom", result.Username);
+    }
+
+    [Fact]
+    public async Task GetUserInfoAsync_ShouldThrow_WhenNotFound()
+    {
+        var service = CreateService(CreateDbContext());
+
+        await Assert.ThrowsAsync<BaseException>(() =>
+            service.GetUserInfoAsync(999)
+        );
+    }
+
+    // ========== GetUserInfoByUsernameAsync ==========
+    [Fact]
+    public async Task GetUserInfoByUsernameAsync_ShouldReturn_WhenExists()
+    {
+        var context = CreateDbContext();
+        context.Users.Add(new User { Id = 2, Username = "Jerry", Password = "aaa" });
+        await context.SaveChangesAsync();
+
+        var service = CreateService(context);
+        var result = await service.GetUserInfoByUsernameAsync("Jerry");
+
+        Assert.NotNull(result);
+        Assert.Equal(2, result.Id);
+    }
+
+    [Fact]
+    public async Task GetUserInfoByUsernameAsync_ShouldThrow_WhenNotFound()
+    {
+        var service = CreateService(CreateDbContext());
+
+        await Assert.ThrowsAsync<BaseException>(() =>
+            service.GetUserInfoByUsernameAsync("Nobody")
+        );
+    }
+
+    // ========== ResetPasswordAsync ==========
+    [Fact]
+    public async Task ResetPasswordAsync_ShouldReset_WhenCorrectPassword()
+    {
+        var context = CreateDbContext();
+        context.Users.Add(new User { Id = 3, Username = "test", Password = "old" });
+        await context.SaveChangesAsync();
+
+        var service = CreateService(context);
+        var result = await service.ResetPasswordAsync(3, "old", "new");
+
+        Assert.True(result);
+        Assert.Equal("new", context.Users.Find(3).Password);
+    }
+
+    [Fact]
+    public async Task ResetPasswordAsync_ShouldThrow_WhenWrongPassword()
+    {
+        var context = CreateDbContext();
+        context.Users.Add(new User { Id = 4, Username = "test", Password = "oldPwd" });
+        await context.SaveChangesAsync();
+
+        var service = CreateService(context);
+
+        await Assert.ThrowsAsync<BaseException>(() =>
+            service.ResetPasswordAsync(4, "wrong", "new")
+        );
+    }
+
+    [Fact]
+    public async Task ResetPasswordAsync_ShouldThrow_WhenUserNotFound()
+    {
+        var service = CreateService(CreateDbContext());
+
+        await Assert.ThrowsAsync<BaseException>(() =>
+            service.ResetPasswordAsync(123, "anything", "new")
+        );
+    }
+
+    // ========== UpdateOlineStatusAsync ==========
+    [Fact]
+    public async Task UpdateOlineStatusAsync_ShouldUpdateStatus()
+    {
+        var context = CreateDbContext();
+        context.Users.Add(new User { Id = 5, Username = "test", Password = "p", OnlineStatusEnum = UserOnlineStatus.Offline });
+        await context.SaveChangesAsync();
+
+        var service = CreateService(context);
+        var result = await service.UpdateOlineStatusAsync(5, UserOnlineStatus.Online);
+
+        Assert.True(result);
+        Assert.Equal(UserOnlineStatus.Online, context.Users.Find(5).OnlineStatusEnum);
+    }
+
+    [Fact]
+    public async Task UpdateOlineStatusAsync_ShouldThrow_WhenUserNotFound()
+    {
+        var service = CreateService(CreateDbContext());
+
+        await Assert.ThrowsAsync<BaseException>(() =>
+            service.UpdateOlineStatusAsync(999, UserOnlineStatus.Online)
+        );
+    }
+
+    // ========== UpdateUserAsync ==========
+    [Fact]
+    public async Task UpdateUserAsync_ShouldUpdateUserFields()
+    {
+        var context = CreateDbContext();
+        context.Users.Add(new User { Id = 6, Username = "test", Password = "p", NickName = "OldName" });
+        await context.SaveChangesAsync();
+
+        var service = CreateService(context);
+        var dto = new UpdateUserDto { NickName = "NewName" };
+
+        var result = await service.UpdateUserAsync(6, dto);
+
+        Assert.NotNull(result);
+        Assert.Equal("NewName", context.Users.Find(6).NickName);
+    }
+
+    [Fact]
+    public async Task UpdateUserAsync_ShouldThrow_WhenNotFound()
+    {
+        var service = CreateService(CreateDbContext());
+
+        await Assert.ThrowsAsync<BaseException>(() =>
+            service.UpdateUserAsync(123, new UpdateUserDto { NickName = "Test" })
+        );
+    }
+}

backend/IMTest/bin/Debug/net8.0/IMTest.runtimeconfig.json

@@ -0,0 +1,19 @@
+{
+  "runtimeOptions": {
+    "tfm": "net8.0",
+    "frameworks": [
+      {
+        "name": "Microsoft.NETCore.App",
+        "version": "8.0.0"
+      },
+      {
+        "name": "Microsoft.AspNetCore.App",
+        "version": "8.0.0"
+      }
+    ],
+    "configProperties": {
+      "System.Reflection.NullabilityInfoContext.IsSupported": true,
+      "System.Runtime.Serialization.EnableUnsafeBinaryFormatterSerialization": false
+    }
+  }
+}

backend/IMTest/bin/Debug/net8.0/IM_API.runtimeconfig.json

@@ -0,0 +1,20 @@
+{
+  "runtimeOptions": {
+    "tfm": "net8.0",
+    "frameworks": [
+      {
+        "name": "Microsoft.NETCore.App",
+        "version": "8.0.0"
+      },
+      {
+        "name": "Microsoft.AspNetCore.App",
+        "version": "8.0.0"
+      }
+    ],
+    "configProperties": {
+      "System.GC.Server": true,
+      "System.Reflection.NullabilityInfoContext.IsSupported": true,
+      "System.Runtime.Serialization.EnableUnsafeBinaryFormatterSerialization": false
+    }
+  }
+}

backend/IMTest/bin/Debug/net8.0/IM_API.staticwebassets.endpoints.json

@@ -0,0 +1 @@
+{"Version":1,"ManifestType":"Build","Endpoints":[]}

backend/IMTest/bin/Debug/net8.0/appsettings.Development.json

@@ -0,0 +1,8 @@
+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  }
+}

backend/IMTest/bin/Debug/net8.0/appsettings.json

@@ -0,0 +1,20 @@
+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  },
+  "AllowedHosts": "*",
+  "Jwt": {
+    "Key": "YourSuperSecretKey123456784124214190!",
+    "Issuer": "IMDemo",
+    "Audience": "IMClients",
+    "AccessTokenMinutes": 15,
+    "RefreshTokenDays": 30
+  },
+  "ConnectionStrings": {
+    "DefaultConnection": "Server=frp-era.com;Port=26582;Database=IM;User=product;Password=12345678;",
+    "Redis": "192.168.5.100:6379"
+  }
+}