Base template solution with tests, authentication, support for admin accounts, prepared tests for auth, basic error handling system used in auth.

Template/WebTests/AuthServiceTests.cs

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+using Microsoft.AspNetCore.Http;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Logging;
+using Moq;
+using TemplateWeb.Data;
+using TemplateWeb.Models;
+using TemplateWeb.Models.DbModels;
+using TemplateWeb.Services;
+
+namespace WebTests;
+
+[TestClass]
+public class AuthServiceTests
+{
+    private AppDbContext _context = null!;
+    private Mock<ILogger<AuthService>> _loggerMock = null!;
+    private Mock<IHttpContextAccessor> _httpContextAccessorMock = null!;
+    private AuthService _authService = null!;
+
+    [TestInitialize]
+    public void Initialize()
+    {
+        var options = new DbContextOptionsBuilder<AppDbContext>()
+            .UseInMemoryDatabase(databaseName: Guid.NewGuid().ToString())
+            .Options;
+        _context = new AppDbContext(options);
+        _loggerMock = new Mock<ILogger<AuthService>>();
+        _httpContextAccessorMock = new Mock<IHttpContextAccessor>();
+        _authService = new AuthService(_context, _loggerMock.Object, _httpContextAccessorMock.Object);
+    }
+
+    [TestCleanup]
+    public void Cleanup()
+    {
+        _context.Database.EnsureDeleted();
+        _context.Dispose();
+    }
+
+    [TestMethod]
+    public async Task RegisterAsync_ShouldReturnSuccess_WhenUserIsNew()
+    {
+        // Arrange
+        var model = new AuthRegisterViewModel
+        {
+            UserName = "testuser",
+            Email = "test@example.com",
+            Password = "password123",
+            ConfirmPassword = "password123"
+        };
+
+        // Act
+        var result = await _authService.RegisterAsync(model);
+
+        // Assert
+        Assert.IsTrue(result.Success);
+        Assert.IsNotNull(result.Data);
+        Assert.AreEqual("testuser", result.Data.UserName);
+        Assert.AreEqual("test@example.com", result.Data.Email);
+        
+        var userInDb = await _context.Users.FirstOrDefaultAsync(u => u.UserName == "testuser");
+        Assert.IsNotNull(userInDb);
+    }
+
+    [TestMethod]
+    public async Task RegisterAsync_ShouldReturnFailure_WhenUserAlreadyExists()
+    {
+        // Arrange
+        var existingUser = new UserModel { UserName = "existing", Email = "existing@example.com", Password = "hashedpassword" };
+        _context.Users.Add(existingUser);
+        await _context.SaveChangesAsync();
+
+        var model = new AuthRegisterViewModel
+        {
+            UserName = "existing",
+            Email = "new@example.com",
+            Password = "password123",
+            ConfirmPassword = "password123"
+        };
+
+        // Act
+        var result = await _authService.RegisterAsync(model);
+
+        // Assert
+        Assert.IsFalse(result.Success);
+        Assert.AreEqual("Username or Email already exists.", result.Message);
+    }
+
+    [TestMethod]
+    public async Task FindUserByEmailOrUsernameAsync_ShouldReturnUser_WhenUsernameMatches()
+    {
+        // Arrange
+        var user = new UserModel { UserName = "testuser", Email = "test@example.com", Password = "password" };
+        _context.Users.Add(user);
+        await _context.SaveChangesAsync();
+
+        // Act
+        var result = await _authService.FindUserByEmailOrUsernameAsync("TESTUSER");
+
+        // Assert
+        Assert.IsTrue(result.Success);
+        Assert.IsNotNull(result.Data);
+        Assert.AreEqual("testuser", result.Data.UserName);
+    }
+
+    [TestMethod]
+    public async Task FindUserByEmailOrUsernameAsync_ShouldReturnFailure_WhenUserNotFound()
+    {
+        // Act
+        var result = await _authService.FindUserByEmailOrUsernameAsync("nonexistent");
+
+        // Assert
+        Assert.IsFalse(result.Success);
+        Assert.AreEqual("User not found.", result.Message);
+    }
+}