feat: Add get transactions viewmodel

Author: ViniciusBerti

src/modules/get_transactions_by_user/app/get_transactions_by_user_viewmodel.py

@@ -1,32 +1,35 @@
-from typing import List
+from typing import List, Dict
+
 from src.shared.domain.entities.transactions import Transaction
 
 
 class TransactionViewmodel:
-    transaction: Transaction
-
+    """
+    Converte uma única entidade Transaction em dicionário.
+    """
     def __init__(self, transaction: Transaction):
-        self.transaction = transaction
+        self.id = transaction.id
+        self.user_id = transaction.user_id
+        self.plan = transaction.plan.name
+        self.value = transaction.value
+        self.create_date = transaction.create_date
 
-    def to_dict(self) -> dict:
+    def to_dict(self) -> Dict:
         return {
-            "id": self.transaction.id,
-            "user_id": self.transaction.user_id,
-            "plan": self.transaction.plan.value,
-            "value": self.transaction.value,
-            "create_date": self.transaction.create_date
+            "id": self.id,
+            "user_id": self.user_id,
+            "plan": self.plan,
+            "value": self.value,
+            "create_date": self.create_date
         }
 
 
 class GetTransactionsByUserViewmodel:
-    transactions: List[Transaction]
-
     def __init__(self, transactions: List[Transaction]):
-        self.transactions = transactions
+        self.transactions = [TransactionViewmodel(t).to_dict() for t in transactions]
 
-    def to_dict(self) -> dict:
+    def to_dict(self) -> Dict:
         return {
-            "transactions": [TransactionViewmodel(t).to_dict() for t in self.transactions] if self.transactions else [],
-            "last_transaction_id": self.transactions[-1].id if self.transactions else None,
-            "message": "the transactions were retrieved successfully"
+            "transactions": self.transactions,
+            "message": "transactions retrieved successfully"
         }

tests/modules/get_transactions_by_user/app/test_get_transactions_by_user_viewmodel.py

@@ -0,0 +1,84 @@
+import pytest
+
+from src.modules.get_transactions_by_user.app.get_transactions_by_user_viewmodel import (
+    GetTransactionsByUserViewmodel
+)
+from src.shared.domain.entities.transactions import Transaction
+from src.shared.domain.enums.plan_enum import PLAN
+
+
+class Test_GetTransactionsByUserViewmodel:
+
+    def test_single_transaction(self):
+        tx = Transaction(
+            id="tx-1",
+            user_id="user-1",
+            plan=PLAN.BRONZE,
+            value=50.0,
+            create_date=1700000000
+        )
+        viewmodel = GetTransactionsByUserViewmodel([tx])
+        result = viewmodel.to_dict()
+
+        expected = {
+            "transactions": [
+                {
+                    "id": "tx-1",
+                    "user_id": "user-1",
+                    "plan": "BRONZE",
+                    "value": 50.0,
+                    "create_date": 1700000000
+                }
+            ],
+            "message": "transactions retrieved successfully"
+        }
+        assert result == expected
+
+    def test_multiple_transactions(self):
+        tx1 = Transaction(
+            id="tx-1",
+            user_id="user-1",
+            plan=PLAN.SILVER,
+            value=75.5,
+            create_date=1700001000
+        )
+        tx2 = Transaction(
+            id="tx-2",
+            user_id="user-1",
+            plan=PLAN.GOLD,
+            value=120.0,
+            create_date=1700002000
+        )
+        viewmodel = GetTransactionsByUserViewmodel([tx1, tx2])
+        result = viewmodel.to_dict()
+
+        expected = {
+            "transactions": [
+                {
+                    "id": "tx-1",
+                    "user_id": "user-1",
+                    "plan": "SILVER",
+                    "value": 75.5,
+                    "create_date": 1700001000
+                },
+                {
+                    "id": "tx-2",
+                    "user_id": "user-1",
+                    "plan": "GOLD",
+                    "value": 120.0,
+                    "create_date": 1700002000
+                }
+            ],
+            "message": "transactions retrieved successfully"
+        }
+        assert result == expected
+
+    def test_empty_list(self):
+        viewmodel = GetTransactionsByUserViewmodel([])
+        result = viewmodel.to_dict()
+
+        expected = {
+            "transactions": [],
+            "message": "transactions retrieved successfully"
+        }
+        assert result == expected