more tests for user rep

Govor.Core/Infrastructure/Validators/IObjectValidator.cs

@@ -6,4 +6,4 @@ public interface IObjectValidator<T>
     bool TryValidate(T objectToValidate);
 }
 
-class InvalidObjectException<T>(Exception ex) : GovorCoreException($"The object {typeof(T).FullName} is invalid.", ex);
+public class InvalidObjectException<T>(Exception ex) : GovorCoreException($"The object {typeof(T).FullName} is invalid.", ex);

Govor.Core/Infrastructure/Validators/UserValidator.cs

@@ -5,6 +5,8 @@ namespace Govor.Core.Infrastructure.Validators;
 
 public class UserValidator : IObjectValidator<User>
 {
+    public const int MIN_LENGHT_OF_NAME = 4;
+    public const int MAX_LENGHT_OF_NAME = 100;
     public void Validate(User user)
     {
         try
@@ -13,9 +15,13 @@ public class UserValidator : IObjectValidator<User>
                 throw new ArgumentNullException(nameof(user));
             if(user.Id == Guid.Empty)
                 throw new ArgumentException("User ID cannot be empty", nameof(user.Id));
+            if(user.Username is null 
+               || user.Username.Length < MIN_LENGHT_OF_NAME 
+               || user.Username.Length > MAX_LENGHT_OF_NAME)
+                throw new ArgumentException($"Username cannot be empty or less then {MIN_LENGHT_OF_NAME} chars or more then {MAX_LENGHT_OF_NAME}", nameof(user.Username));
             if(user.HashPassword is null || user.HashPassword == string.Empty)
                 throw new ArgumentException("Password cannot be empty", nameof(user.HashPassword));
-            if(user.CreatedOn == DateTime.MinValue)
+            if(user.CreatedOn == DateOnly.MinValue)
                 throw new ArgumentException("Time of creation account cannot be empty", nameof(user.CreatedOn));
         }
         catch(Exception ex)