""" Contract test for POST /retail/sales 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 RetailSalesPostContractTest(TestCase): def setUp(self): self.client = APIClient() self.sales_url = '/api/v1/retail/sales/' # Tenant authentication header self.tenant_auth = {'HTTP_AUTHORIZATION': 'Bearer tenant_token'} # Valid sale data self.sale_data = { 'customer': { 'name': 'John Doe', 'email': 'john.doe@example.com', 'phone': '+60123456789', 'address': { 'street': '123 Customer Street', 'city': 'Kuala Lumpur', 'state': 'Wilayah Persekutuan', 'postal_code': '50000', 'country': 'Malaysia' } }, 'items': [ { 'product_id': 'product-001', 'sku': 'LPT-001', 'quantity': 2, 'unit_price': 2499.99, 'discount_percentage': 5.0, 'tax_rate': 6.0 }, { 'product_id': 'product-002', 'sku': 'MOU-001', 'quantity': 1, 'unit_price': 99.99, 'discount_percentage': 0.0, 'tax_rate': 6.0 } ], 'payment': { 'method': 'CASH', 'amount_paid': 5300.00, 'reference_number': 'CASH-001' }, 'discount': { 'type': 'percentage', 'value': 2.0, 'reason': 'Loyalty discount' }, 'notes': 'Customer requested expedited delivery', 'sales_channel': 'IN_STORE', 'staff_id': 'staff-001' } def test_create_sale_success(self): """Test successful sale creation.""" response = self.client.post( self.sales_url, data=json.dumps(self.sale_data), content_type='application/json', **self.tenant_auth ) # This should fail before implementation assert response.status_code == status.HTTP_201_CREATED data = response.json() assert 'id' in data assert data['status'] == 'COMPLETED' assert 'customer' in data assert 'items' in data assert 'payment' in data assert 'totals' in data # Check customer information customer = data['customer'] assert customer['name'] == self.sale_data['customer']['name'] assert customer['email'] == self.sale_data['customer']['email'] # Check items items = data['items'] assert len(items) == 2 assert items[0]['product_id'] == self.sale_data['items'][0]['product_id'] assert items[0]['quantity'] == self.sale_data['items'][0]['quantity'] # Check payment payment = data['payment'] assert payment['method'] == self.sale_data['payment']['method'] assert payment['amount_paid'] == self.sale_data['payment']['amount_paid'] # Check totals totals = data['totals'] assert 'subtotal' in totals assert 'discount_amount' in totals assert 'tax_amount' in totals assert 'total_amount' in totals # Should have timestamps assert 'created_at' in data assert 'updated_at' in data # Should have tenant_id from context assert 'tenant_id' in data def test_create_sale_unauthorized(self): """Test sale creation without authentication.""" response = self.client.post( self.sales_url, data=json.dumps(self.sale_data), content_type='application/json' ) assert response.status_code == status.HTTP_401_UNAUTHORIZED def test_create_sale_missing_required_fields(self): """Test sale creation with missing required fields.""" incomplete_data = self.sale_data.copy() del incomplete_data['customer'] response = self.client.post( self.sales_url, data=json.dumps(incomplete_data), content_type='application/json', **self.tenant_auth ) assert response.status_code == status.HTTP_400_BAD_REQUEST data = response.json() assert 'customer' in data.get('errors', {}) def test_create_sale_empty_items(self): """Test sale creation with empty items list.""" invalid_data = self.sale_data.copy() invalid_data['items'] = [] response = self.client.post( self.sales_url, data=json.dumps(invalid_data), content_type='application/json', **self.tenant_auth ) assert response.status_code == status.HTTP_400_BAD_REQUEST def test_create_sale_invalid_payment_method(self): """Test sale creation with invalid payment method.""" invalid_data = self.sale_data.copy() invalid_data['payment']['method'] = 'INVALID_METHOD' response = self.client.post( self.sales_url, data=json.dumps(invalid_data), content_type='application/json', **self.tenant_auth ) assert response.status_code == status.HTTP_400_BAD_REQUEST def test_create_sale_insufficient_payment(self): """Test sale creation with insufficient payment amount.""" invalid_data = self.sale_data.copy() invalid_data['payment']['amount_paid'] = 100.00 # Much less than total response = self.client.post( self.sales_url, data=json.dumps(invalid_data), content_type='application/json', **self.tenant_auth ) assert response.status_code == status.HTTP_400_BAD_REQUEST def test_create_sale_negative_quantity(self): """Test sale creation with negative quantity.""" invalid_data = self.sale_data.copy() invalid_data['items'][0]['quantity'] = -1 response = self.client.post( self.sales_url, data=json.dumps(invalid_data), content_type='application/json', **self.tenant_auth ) assert response.status_code == status.HTTP_400_BAD_REQUEST def test_create_sale_invalid_discount_percentage(self): """Test sale creation with invalid discount percentage.""" invalid_data = self.sale_data.copy() invalid_data['items'][0]['discount_percentage'] = 150.0 # Over 100% response = self.client.post( self.sales_url, data=json.dumps(invalid_data), content_type='application/json', **self.tenant_auth ) assert response.status_code == status.HTTP_400_BAD_REQUEST def test_create_sale_with_installment(self): """Test sale creation with installment payment.""" installment_data = self.sale_data.copy() installment_data['payment']['method'] = 'INSTALLMENT' installment_data['payment']['installment_plan'] = { 'down_payment': 1000.00, 'number_of_installments': 12, 'installment_amount': 358.33, 'first_installment_date': '2024-02-01' } response = self.client.post( self.sales_url, data=json.dumps(installment_data), content_type='application/json', **self.tenant_auth ) if response.status_code == status.HTTP_201_CREATED: data = response.json() assert data['status'] == 'COMPLETED' assert 'installment_plan' in data['payment'] def test_create_sale_with_multiple_payments(self): """Test sale creation with multiple payment methods.""" multi_payment_data = self.sale_data.copy() multi_payment_data['payment'] = [ { 'method': 'CASH', 'amount_paid': 2000.00, 'reference_number': 'CASH-001' }, { 'method': 'CARD', 'amount_paid': 3300.00, 'reference_number': 'CARD-001', 'card_last4': '4242' } ] response = self.client.post( self.sales_url, data=json.dumps(multi_payment_data), content_type='application/json', **self.tenant_auth ) if response.status_code == status.HTTP_201_CREATED: data = response.json() assert len(data['payment']) == 2 assert data['payment'][0]['method'] == 'CASH' def test_create_sale_with_loyalty_points(self): """Test sale creation with loyalty points redemption.""" loyalty_data = self.sale_data.copy() loyalty_data['loyalty'] = { 'points_used': 1000, 'points_value': 100.00, 'customer_id': 'customer-001' } response = self.client.post( self.sales_url, data=json.dumps(loyalty_data), content_type='application/json', **self.tenant_auth ) if response.status_code == status.HTTP_201_CREATED: data = response.json() assert 'loyalty' in data assert data['loyalty']['points_used'] == 1000 def test_create_sale_with_delivery_info(self): """Test sale creation with delivery information.""" delivery_data = self.sale_data.copy() delivery_data['delivery'] = { 'method': 'DELIVERY', 'address': self.sale_data['customer']['address'], 'scheduled_date': '2024-01-20', 'delivery_fee': 50.00, 'notes': 'Leave at front door' } response = self.client.post( self.sales_url, data=json.dumps(delivery_data), content_type='application/json', **self.tenant_auth ) if response.status_code == status.HTTP_201_CREATED: data = response.json() assert 'delivery' in data assert data['delivery']['method'] == 'DELIVERY' def test_create_sale_with_exchange_items(self): """Test sale creation with item exchange.""" exchange_data = self.sale_data.copy() exchange_data['exchange'] = { 'items': [ { 'product_id': 'old-product-001', 'sku': 'OLD-001', 'condition': 'GOOD', 'exchange_value': 500.00 } ], 'total_exchange_value': 500.00 } response = self.client.post( self.sales_url, data=json.dumps(exchange_data), content_type='application/json', **self.tenant_auth ) if response.status_code == status.HTTP_201_CREATED: data = response.json() assert 'exchange' in data assert len(data['exchange']['items']) == 1 def test_create_sale_tax_calculation(self): """Test that tax calculation is correct.""" response = self.client.post( self.sales_url, data=json.dumps(self.sale_data), content_type='application/json', **self.tenant_auth ) if response.status_code == status.HTTP_201_CREATED: data = response.json() totals = data['totals'] # Verify tax calculation (6% GST on subtotal after discounts) # This will be validated once implementation exists assert 'tax_amount' in totals assert totals['tax_amount'] >= 0 def test_create_sale_tenant_isolation(self): """Test that sale creation respects tenant isolation.""" response = self.client.post( self.sales_url, data=json.dumps(self.sale_data), content_type='application/json', **self.tenant_auth ) if response.status_code == status.HTTP_201_CREATED: data = response.json() # Sale should be created in the authenticated tenant's context assert 'tenant_id' in data # This will be validated once implementation exists def test_create_sale_inventory_validation(self): """Test that sale creation validates inventory availability.""" response = self.client.post( self.sales_url, data=json.dumps(self.sale_data), content_type='application/json', **self.tenant_auth ) # This test will ensure that the system checks if sufficient stock is available # The test should pass if implementation exists and validates inventory if response.status_code == status.HTTP_201_CREATED: # Success means inventory was available pass elif response.status_code == status.HTTP_400_BAD_REQUEST: # This could also be valid if inventory validation fails pass