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

Template/TemplateWeb/ViewModels/AuthLoginViewModel.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace TemplateWeb.Models;
+
+public class AuthLoginViewModel
+{
+    [Required(ErrorMessage = "Email or username is required")]
+    [Display(Name = "Email or Username")]
+    public string EmailOrUsername { get; set; } = "";
+    
+    [Display(Name = "Password")]
+    [DataType(DataType.Password)]
+    [Required] [MinLength(5)]
+    public string Password { get; set; }
+
+    [Display(Name = "Remember me?")]
+    public bool RememberMe { get; set; } = false;
+    public string? ReturnUrl { get; set; }
+}

Template/TemplateWeb/ViewModels/AuthRegisterViewModel.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace TemplateWeb.Models;
+
+public class AuthRegisterViewModel
+{
+    [Required] [Display(Name = "Username")] [StringLength(50, MinimumLength = 3)]
+    public string UserName { get; set; }
+    
+    [Required] [EmailAddress] [Display(Name = "Email")]
+    public string Email { get; set; }
+    
+    [Required] [DataType(DataType.Password)] [Display(Name = "Password")]
+    public string Password { get; set; }
+    
+    [Display(Name = "Confirm password")]
+    [Required] [DataType(DataType.Password)] [Compare("Password")]
+    public string ConfirmPassword { get; set; }
+    
+    public string? ReturnUrl { get; set; }
+}

Template/TemplateWeb/ViewModels/ErrorViewModel.cs

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+namespace TemplateWeb.Models;
+
+public class ErrorViewModel
+{
+    public string? RequestId { get; set; }
+
+    public bool ShowRequestId => !string.IsNullOrEmpty(RequestId);
+}