Refactor User and UserDto to inherit from UserBase

- Aktualisierte `User` und `UserDto` Klassen um von einer neuen `UserBase` Klasse zu erben.
- Verschieben der Eigenschaften `Vorname`, `Email` und `Alter` zu `UserBase`.
- Implementierung der überschriebenen Methoden `GetHashCode` und `Equals` sowohl in `User` als auch in `UserDto`, um die Eigenschaften der Basisklasse zu nutzen.

DigitalData.Core.Tests/Mock/User.cs

@@ -1,12 +1,12 @@
 namespace DigitalData.Core.Tests.Mock;
 
-public class User
+public class User : UserBase
 {
     public required int Id { get; init; }
 
-    public required string FirstName { get; init; }
+    public override int GetHashCode() => HashCode.Combine(Id, FirstName, Email, Age);
 
-    public required string Email { get; init; }
-
-    public int Age { get; init; }
+    public override bool Equals(object? obj)
+        => (obj is User user && user.GetHashCode() == GetHashCode())
+        || (obj is UserBase userBase && userBase.GetHashCode() == base.GetHashCode());
 }

DigitalData.Core.Tests/Mock/UserBase.cs

@@ -0,0 +1,14 @@
+namespace DigitalData.Core.Tests.Mock;
+
+public class UserBase
+{
+    public required string FirstName { get; init; }
+
+    public required string Email { get; init; }
+
+    public required int Age { get; init; }
+
+    public override int GetHashCode() => HashCode.Combine(FirstName, Email, Age);
+
+    public override bool Equals(object? obj) => obj is UserBase user && user.GetHashCode() == GetHashCode();
+}

DigitalData.Core.Tests/Mock/UserDto.cs

@@ -1,10 +1,5 @@
 namespace DigitalData.Core.Tests.Mock;
 
-public class UserDto
+public class UserDto : UserBase
 {
-    public required string FirstName { get; init; }
-
-    public required string Email { get; init; }
-
-    public int Age { get; init; }
 }