project initialization

backend/tests/contract/test_subscriptions_post.py

@@ -0,0 +1,264 @@
+"""
+Contract test for POST /subscriptions endpoint.
+This test MUST fail before implementation.
+"""
+
+import pytest
+from django.test import TestCase
+from django.urls import reverse
+from rest_framework.test import APIClient
+from rest_framework import status
+import json
+
+
+class SubscriptionsPostContractTest(TestCase):
+    def setUp(self):
+        self.client = APIClient()
+        self.subscriptions_url = '/api/v1/subscriptions/'
+
+        # Admin authentication header
+        self.admin_auth = {'HTTP_AUTHORIZATION': 'Bearer admin_token'}
+
+        # Tenant admin authentication header
+        self.tenant_admin_auth = {'HTTP_AUTHORIZATION': 'Bearer tenant_admin_token'}
+
+        # Valid subscription data
+        self.subscription_data = {
+            'tenant_id': 'test-tenant-id',
+            'plan': 'GROWTH',
+            'pricing_model': 'SUBSCRIPTION',
+            'billing_cycle': 'MONTHLY',
+            'payment_method': {
+                'type': 'CARD',
+                'card_last4': '4242',
+                'expiry_month': 12,
+                'expiry_year': 2025,
+                'brand': 'visa'
+            },
+            'modules': ['retail', 'inventory'],
+            'trial_days': 14,
+            'notes': 'Subscription for retail business'
+        }
+
+    def test_create_subscription_success_admin(self):
+        """Test successful subscription creation by admin."""
+        response = self.client.post(
+            self.subscriptions_url,
+            data=json.dumps(self.subscription_data),
+            content_type='application/json',
+            **self.admin_auth
+        )
+
+        # This should fail before implementation
+        assert response.status_code == status.HTTP_201_CREATED
+
+        data = response.json()
+        assert 'id' in data
+        assert data['tenant_id'] == self.subscription_data['tenant_id']
+        assert data['plan'] == self.subscription_data['plan']
+        assert data['pricing_model'] == self.subscription_data['pricing_model']
+        assert data['billing_cycle'] == self.subscription_data['billing_cycle']
+        assert data['status'] == 'TRIAL'  # Default status with trial_days
+
+        # Should have timestamps
+        assert 'created_at' in data
+        assert 'updated_at' in data
+
+        # Should have billing period information
+        assert 'current_period_start' in data
+        assert 'current_period_end' in data
+        assert 'trial_end' in data
+
+        # Should include modules
+        assert 'modules' in data
+        assert data['modules'] == self.subscription_data['modules']
+
+    def test_create_subscription_success_tenant_admin(self):
+        """Test successful subscription creation by tenant admin."""
+        # Tenant admin creates subscription for their own tenant
+        tenant_subscription_data = self.subscription_data.copy()
+        del tenant_subscription_data['tenant_id']  # Should be inferred from context
+
+        response = self.client.post(
+            self.subscriptions_url,
+            data=json.dumps(tenant_subscription_data),
+            content_type='application/json',
+            **self.tenant_admin_auth
+        )
+
+        # This should fail before implementation
+        assert response.status_code == status.HTTP_201_CREATED
+
+        data = response.json()
+        assert 'id' in data
+        assert data['plan'] == tenant_subscription_data['plan']
+        assert data['tenant_id']  # Should be auto-populated
+
+    def test_create_subscription_unauthorized(self):
+        """Test subscription creation without authentication."""
+        response = self.client.post(
+            self.subscriptions_url,
+            data=json.dumps(self.subscription_data),
+            content_type='application/json'
+        )
+
+        assert response.status_code == status.HTTP_401_UNAUTHORIZED
+
+    def test_create_subscription_forbidden(self):
+        """Test subscription creation by regular user (no permissions)."""
+        user_auth = {'HTTP_AUTHORIZATION': 'Bearer user_token'}
+
+        response = self.client.post(
+            self.subscriptions_url,
+            data=json.dumps(self.subscription_data),
+            content_type='application/json',
+            **user_auth
+        )
+
+        assert response.status_code == status.HTTP_403_FORBIDDEN
+
+    def test_create_subscription_missing_required_fields(self):
+        """Test subscription creation with missing required fields."""
+        incomplete_data = self.subscription_data.copy()
+        del incomplete_data['plan']
+
+        response = self.client.post(
+            self.subscriptions_url,
+            data=json.dumps(incomplete_data),
+            content_type='application/json',
+            **self.admin_auth
+        )
+
+        assert response.status_code == status.HTTP_400_BAD_REQUEST
+
+        data = response.json()
+        assert 'plan' in data.get('errors', {})
+
+    def test_create_subscription_invalid_plan(self):
+        """Test subscription creation with invalid plan."""
+        invalid_data = self.subscription_data.copy()
+        invalid_data['plan'] = 'INVALID_PLAN'
+
+        response = self.client.post(
+            self.subscriptions_url,
+            data=json.dumps(invalid_data),
+            content_type='application/json',
+            **self.admin_auth
+        )
+
+        assert response.status_code == status.HTTP_400_BAD_REQUEST
+
+    def test_create_subscription_invalid_billing_cycle(self):
+        """Test subscription creation with invalid billing cycle."""
+        invalid_data = self.subscription_data.copy()
+        invalid_data['billing_cycle'] = 'INVALID_CYCLE'
+
+        response = self.client.post(
+            self.subscriptions_url,
+            data=json.dumps(incomplete_data),
+            content_type='application/json',
+            **self.admin_auth
+        )
+
+        assert response.status_code == status.HTTP_400_BAD_REQUEST
+
+    def test_create_subscription_duplicate_tenant(self):
+        """Test subscription creation with duplicate tenant."""
+        # First request should succeed (if implemented)
+        first_response = self.client.post(
+            self.subscriptions_url,
+            data=json.dumps(self.subscription_data),
+            content_type='application/json',
+            **self.admin_auth
+        )
+
+        if first_response.status_code == status.HTTP_201_CREATED:
+            # Second request with same tenant should fail
+            second_response = self.client.post(
+                self.subscriptions_url,
+                data=json.dumps(self.subscription_data),
+                content_type='application/json',
+                **self.admin_auth
+            )
+            assert second_response.status_code == status.HTTP_400_BAD_REQUEST
+
+    def test_create_subscription_without_trial(self):
+        """Test subscription creation without trial period."""
+        no_trial_data = self.subscription_data.copy()
+        del no_trial_data['trial_days']
+
+        response = self.client.post(
+            self.subscriptions_url,
+            data=json.dumps(no_trial_data),
+            content_type='application/json',
+            **self.admin_auth
+        )
+
+        if response.status_code == status.HTTP_201_CREATED:
+            data = response.json()
+            # Should be active immediately without trial
+            assert data['status'] == 'ACTIVE'
+            assert 'trial_end' not in data or data['trial_end'] is None
+
+    def test_create_subscription_with_invalid_modules(self):
+        """Test subscription creation with invalid modules."""
+        invalid_data = self.subscription_data.copy()
+        invalid_data['modules'] = ['invalid_module']
+
+        response = self.client.post(
+            self.subscriptions_url,
+            data=json.dumps(invalid_data),
+            content_type='application/json',
+            **self.admin_auth
+        )
+
+        assert response.status_code == status.HTTP_400_BAD_REQUEST
+
+    def test_create_subscription_tenant_admin_cross_tenant(self):
+        """Test that tenant admin cannot create subscription for other tenant."""
+        # Tenant admin trying to create subscription for different tenant
+        response = self.client.post(
+            self.subscriptions_url,
+            data=json.dumps(self.subscription_data),
+            content_type='application/json',
+            **self.tenant_admin_auth
+        )
+
+        # Should fail because tenant_id doesn't match their tenant
+        assert response.status_code == status.HTTP_403_FORBIDDEN
+
+    def test_create_subscription_payment_method_validation(self):
+        """Test subscription creation with invalid payment method."""
+        invalid_data = self.subscription_data.copy()
+        invalid_data['payment_method'] = {
+            'type': 'CARD',
+            'card_last4': '4242',
+            # Missing required expiry fields
+        }
+
+        response = self.client.post(
+            self.subscriptions_url,
+            data=json.dumps(invalid_data),
+            content_type='application/json',
+            **self.admin_auth
+        )
+
+        assert response.status_code == status.HTTP_400_BAD_REQUEST
+
+    def test_create_subscription_with_promo_code(self):
+        """Test subscription creation with promo code."""
+        promo_data = self.subscription_data.copy()
+        promo_data['promo_code'] = 'WELCOME20'
+
+        response = self.client.post(
+            self.subscriptions_url,
+            data=json.dumps(promo_data),
+            content_type='application/json',
+            **self.admin_auth
+        )
+
+        if response.status_code == status.HTTP_201_CREATED:
+            data = response.json()
+            # Should include discount information
+            assert 'discount' in data
+            assert data['promo_code'] == 'WELCOME20'