feat: add UserId value object and update ClassifiedAd to use it

tests/test_classified_ad.py

@@ -1,12 +1,13 @@
 from decimal import Decimal
-from uuid import UUID, uuid4
+from uuid import uuid4
 
 from domain.marketplace.classified_ad import ClassifiedAd
+from domain.marketplace.user_id import UserId
 
 
 def test_classified_ad_creation():
     ad_id = uuid4()
-    owner_id = uuid4()
+    owner_id = UserId(value=uuid4())
 
     ad = ClassifiedAd(
         id=ad_id,
@@ -26,7 +27,7 @@ def test_classified_ad_creation():
 def test_classified_ad_is_immutable():
     ad = ClassifiedAd(
         id=uuid4(),
-        _ownerId=uuid4(),
+        _ownerId=UserId(value=uuid4()),
         title="Title",
         text="Text",
         _price=Decimal("10.00"),
@@ -41,7 +42,7 @@ def test_classified_ad_is_immutable():
 
 def test_classified_ad_equality():
     ad_id = uuid4()
-    owner_id = uuid4()
+    owner_id = UserId(value=uuid4())
 
     ad1 = ClassifiedAd(
         id=ad_id,
@@ -58,4 +59,4 @@ def test_classified_ad_equality():
         _price=Decimal("10.00"),
     )
 
-    assert ad1 == ad2
+    assert ad1 == ad2

tests/test_user_id.py

@@ -0,0 +1,25 @@
+from uuid import UUID, uuid4
+
+from domain.marketplace.user_id import UserId
+
+
+def test_user_id_creation():
+    user_id = UserId(value=uuid4())
+    assert isinstance(user_id.value, UUID)
+
+
+def test_user_id_is_immutable():
+    user_id = UserId(value=uuid4())
+
+    try:
+        user_id.value = uuid4()  # type: ignore
+        assert False, "Should have raised FrozenInstanceError"
+    except AttributeError:
+        pass
+
+
+def test_user_id_equality():
+    uid = uuid4()
+    user_id1 = UserId(value=uid)
+    user_id2 = UserId(value=uid)
+    assert user_id1 == user_id2