feat(api): add endpoints for importing files and getting account balance

app/apps/api/tests/test_accounts.py

@@ -0,0 +1,99 @@
+from datetime import date
+from decimal import Decimal
+
+from django.contrib.auth import get_user_model
+from django.test import TestCase, override_settings
+from rest_framework import status
+from rest_framework.test import APIClient
+
+from apps.accounts.models import Account, AccountGroup
+from apps.currencies.models import Currency
+from apps.transactions.models import Transaction
+
+
+@override_settings(
+    STORAGES={
+        "default": {"BACKEND": "django.core.files.storage.FileSystemStorage"},
+        "staticfiles": {
+            "BACKEND": "django.contrib.staticfiles.storage.StaticFilesStorage"
+        },
+    },
+    WHITENOISE_AUTOREFRESH=True,
+)
+class AccountBalanceAPITests(TestCase):
+    """Tests for the Account Balance API endpoint"""
+
+    def setUp(self):
+        """Set up test data"""
+        User = get_user_model()
+        self.user = User.objects.create_user(
+            email="testuser@test.com", password="testpass123"
+        )
+        self.client = APIClient()
+        self.client.force_authenticate(user=self.user)
+
+        self.currency = Currency.objects.create(
+            code="USD", name="US Dollar", decimal_places=2, prefix="$ "
+        )
+        self.account_group = AccountGroup.objects.create(name="Test Group")
+        self.account = Account.objects.create(
+            name="Test Account", group=self.account_group, currency=self.currency
+        )
+
+        # Create some transactions
+        Transaction.objects.create(
+            account=self.account,
+            type=Transaction.Type.INCOME,
+            amount=Decimal("500.00"),
+            is_paid=True,
+            date=date(2025, 1, 1),
+            description="Paid income",
+        )
+        Transaction.objects.create(
+            account=self.account,
+            type=Transaction.Type.INCOME,
+            amount=Decimal("200.00"),
+            is_paid=False,
+            date=date(2025, 1, 15),
+            description="Unpaid income",
+        )
+        Transaction.objects.create(
+            account=self.account,
+            type=Transaction.Type.EXPENSE,
+            amount=Decimal("100.00"),
+            is_paid=True,
+            date=date(2025, 1, 10),
+            description="Paid expense",
+        )
+
+    def test_get_balance_success(self):
+        """Test successful balance retrieval"""
+        response = self.client.get(f"/api/accounts/{self.account.id}/balance/")
+
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        self.assertIn("current_balance", response.data)
+        self.assertIn("projected_balance", response.data)
+        self.assertIn("currency", response.data)
+
+        # Current: 500 - 100 = 400
+        self.assertEqual(Decimal(response.data["current_balance"]), Decimal("400.00"))
+        # Projected: (500 + 200) - 100 = 600
+        self.assertEqual(Decimal(response.data["projected_balance"]), Decimal("600.00"))
+
+        # Check currency data
+        self.assertEqual(response.data["currency"]["code"], "USD")
+
+    def test_get_balance_nonexistent_account(self):
+        """Test balance for non-existent account returns 404"""
+        response = self.client.get("/api/accounts/99999/balance/")
+
+        self.assertEqual(response.status_code, status.HTTP_404_NOT_FOUND)
+
+    def test_get_balance_unauthenticated(self):
+        """Test unauthenticated request returns 403"""
+        unauthenticated_client = APIClient()
+        response = unauthenticated_client.get(
+            f"/api/accounts/{self.account.id}/balance/"
+        )
+
+        self.assertEqual(response.status_code, status.HTTP_403_FORBIDDEN)