IM/backend/IMTest/Service/UserServiceTest.cs

using Xunit;
using Microsoft.EntityFrameworkCore;
using Moq;
using AutoMapper;
using IM_API.Services;
using IM_API.Models;
using IM_API.Exceptions;
using IM_API.Tools;
using Microsoft.Extensions.Logging;
using System;
using System.Threading.Tasks;
using IM_API.Dtos.User;

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" })
        );
    }
}