@@ -0,0 +1,120 @@
+using Jiaowu.Api.Controllers;
+using Jiaowu.Api.Domain.Academic;
+using Jiaowu.Api.Domain.Identity;
+using Jiaowu.Api.Infrastructure.Auth;
+using Jiaowu.Api.Infrastructure.Persistence;
+using Microsoft.AspNetCore.Identity;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.Data.Sqlite;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Storage;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace Jiaowu.Api.Tests;
+
+public sealed class AuthControllerTests
+{
+    [Fact]
+    public async Task ActivateStudent_WorksWithRetryingExecutionStrategy()
+    {
+        await using var connection = new SqliteConnection("Data Source=:memory:");
+        await connection.OpenAsync();
+        var services = new ServiceCollection();
+        services.AddLogging();
+        services.AddDbContext<AppDbContext>(options => options
+            .UseSqlite(connection)
+            .ReplaceService<IExecutionStrategyFactory, RetryingExecutionStrategyFactory>());
+        services
+            .AddIdentityCore<ApplicationUser>(options =>
+            {
+                options.Password.RequiredLength = 8;
+                options.Password.RequireDigit = true;
+                options.Password.RequireLowercase = true;
+                options.Password.RequireUppercase = true;
+                options.Password.RequireNonAlphanumeric = true;
+            })
+            .AddRoles<ApplicationRole>()
+            .AddEntityFrameworkStores<AppDbContext>();
+
+        await using var provider = services.BuildServiceProvider();
+        await using var scope = provider.CreateAsyncScope();
+        var db = scope.ServiceProvider.GetRequiredService<AppDbContext>();
+        await db.Database.EnsureCreatedAsync();
+        var roleManager = scope.ServiceProvider
+            .GetRequiredService<RoleManager<ApplicationRole>>();
+        Assert.True((await roleManager.CreateAsync(new ApplicationRole
+        {
+            Name = SystemRoles.Student,
+            Description = "学生"
+        })).Succeeded);
+
+        var college = new College { Code = "CS", Name = "计算机学院" };
+        var major = new Major
+        {
+            Code = "SE",
+            Name = "软件工程",
+            CollegeId = college.Id,
+            DegreeType = "工学"
+        };
+        var administrativeClass = new AdministrativeClass
+        {
+            Code = "SE202601",
+            Name = "软件工程 2026 级 1 班",
+            MajorId = major.Id,
+            Grade = 2026
+        };
+        var student = new Student
+        {
+            StudentNumber = "202601999",
+            Name = "测试学生",
+            AdministrativeClassId = administrativeClass.Id,
+            EnrollmentYear = 2026,
+            EnrollmentDate = new DateOnly(2026, 9, 1),
+            Status = StudentStatus.Active
+        };
+        db.AddRange(college, major, administrativeClass, student);
+        await db.SaveChangesAsync();
+
+        var userManager = scope.ServiceProvider
+            .GetRequiredService<UserManager<ApplicationUser>>();
+        Assert.True(db.Database.CreateExecutionStrategy().RetriesOnFailure);
+        var controller = new AuthController(db, userManager, new StubTokenService());
+        var request = new StudentActivationRequest(
+            student.Name,
+            student.StudentNumber,
+            college.Id,
+            major.Id,
+            administrativeClass.Grade,
+            administrativeClass.Id,
+            "Student@123");
+
+        var result = await controller.ActivateStudent(request, CancellationToken.None);
+
+        Assert.IsType<OkObjectResult>(result);
+        var user = await userManager.FindByNameAsync(student.StudentNumber);
+        Assert.NotNull(user);
+        Assert.Equal(student.Name, user.DisplayName);
+        Assert.Equal(college.Id, user.CollegeId);
+        Assert.True(await userManager.IsInRoleAsync(user, SystemRoles.Student));
+        await db.Entry(student).ReloadAsync();
+        Assert.Equal(user.Id, student.UserId);
+    }
+
+    private sealed class RetryingExecutionStrategyFactory(
+        ExecutionStrategyDependencies dependencies) : IExecutionStrategyFactory
+    {
+        public IExecutionStrategy Create() => new TestRetryingExecutionStrategy(dependencies);
+    }
+
+    private sealed class TestRetryingExecutionStrategy(
+        ExecutionStrategyDependencies dependencies)
+        : ExecutionStrategy(dependencies, 1, TimeSpan.Zero)
+    {
+        protected override bool ShouldRetryOn(Exception exception) => false;
+    }
+
+    private sealed class StubTokenService : ITokenService
+    {
+        public string Create(ApplicationUser user, IEnumerable<string> roles) => string.Empty;
+    }
+}