fix error in gitignore

apps/payments/tests.py

@@ -0,0 +1,39 @@
+from decimal import Decimal
+
+from django.contrib.auth import get_user_model
+from django.db import IntegrityError, transaction
+from django.test import TestCase
+
+from apps.accounts.models import Customer
+from apps.orders.models import ProcessingOrder
+from apps.payments.gateways import get_gateway
+from apps.payments.models import Payment
+from apps.workflows.models import Workflow, WorkflowVersion
+
+User = get_user_model()
+
+
+class PaymentTests(TestCase):
+    def setUp(self):
+        self.user = User.objects.create_user(username="c", password="***")
+        self.customer = Customer.objects.create(user=self.user)
+        wf = Workflow.objects.create(name="W", slug="w-pay")
+        version = WorkflowVersion.objects.create(workflow=wf, version=1)
+        self.order = ProcessingOrder.objects.create(customer=self.customer, workflow_version=version)
+
+    def test_mock_gateway_verify_returns_success(self):
+        result = get_gateway().verify("AUTH-1", "1000")
+        self.assertEqual(result["status"], "success")
+        self.assertTrue(result["transaction_id"])
+
+    def test_duplicate_gateway_transaction_rejected(self):
+        Payment.objects.create(
+            order=self.order, amount=Decimal("1000"), currency="IRR",
+            gateway="mock", transaction_id="TXN-1", status="success",
+        )
+        with self.assertRaises(IntegrityError):
+            with transaction.atomic():
+                Payment.objects.create(
+                    order=self.order, amount=Decimal("1000"), currency="IRR",
+                    gateway="mock", transaction_id="TXN-1", status="success",
+                )