Shopping Cart Payload Validation Testing
- Shopping Cart Payload Validation Test Cases
- Overview
- Test Categories
- Test Execution Framework
- Success Criteria
- Test Environment Requirements
Disclaimer: This document contains sample content for illustrative purposes only. Organizations should follow their own established best practices, security requirements, and compliance standards to ensure solutions are production-ready.
Shopping Cart Payload Validation Test Cases
Overview
These test cases validate the handling of incorrect shopping cart payloads that are rejected by the API Gateway, ensuring proper error handling, alerting mechanisms, and system resilience when malformed or invalid cart data is submitted.
Test Categories
1. Payload Structure Validation
1.1 Malformed JSON Payload
Objective: Verify API Gateway rejects malformed JSON and triggers appropriate alerts
Test Payload:
{
"cart_id": "test-cart-001",
"items": [
{
"sku": "ITEM-001",
"quantity": 2,
"price": 9.99
}
// Missing closing bracket - malformed JSON
"total": 19.98
Expected Results:
- API Gateway returns 400 Bad Request
- Alert triggered within 30 seconds
- Error logged with payload details
- No downstream processing occurs
1.2 Missing Required Fields
Objective: Test rejection of payloads missing mandatory fields
Test Payload:
{
"cart_id": "test-cart-002",
"items": [
{
"sku": "ITEM-001",
"quantity": 2
// Missing required "price" field
}
]
// Missing required "total" field
}
Expected Results:
- API Gateway returns 400 Bad Request with field validation errors
- Alert includes specific missing field information
- Validation error details logged
1.3 Invalid Data Types
Objective: Verify rejection of incorrect data types
Test Payload:
{
"cart_id": "test-cart-003",
"items": [
{
"sku": "ITEM-001",
"quantity": "two", // Should be integer
"price": "invalid" // Should be number
}
],
"total": true // Should be number
}
Expected Results:
- API Gateway returns 400 Bad Request
- Type validation errors clearly identified
- Alert triggered with data type mismatch details
2. Business Logic Validation
2.1 Negative Quantities
Objective: Test rejection of invalid quantity values
Test Payload:
{
"cart_id": "test-cart-004",
"items": [
{
"sku": "ITEM-001",
"quantity": -1,
"price": 9.99
},
{
"sku": "ITEM-002",
"quantity": 0,
"price": 15.50
}
],
"total": 9.99
}
Expected Results:
- API Gateway returns 422 Unprocessable Entity
- Business validation error alert triggered
- Invalid quantity values logged
2.2 Price Inconsistencies
Objective: Verify detection of price calculation errors
Test Payload:
{
"cart_id": "test-cart-005",
"items": [
{
"sku": "ITEM-001",
"quantity": 2,
"price": 9.99
},
{
"sku": "ITEM-002",
"quantity": 1,
"price": 15.50
}
],
"total": 50.00 // Incorrect total (should be 35.48)
}
Expected Results:
- API Gateway returns 422 Unprocessable Entity
- Price validation alert triggered
- Calculation discrepancy logged
2.3 Invalid SKU Format
Objective: Test rejection of malformed SKU identifiers
Test Payload:
{
"cart_id": "test-cart-006",
"items": [
{
"sku": "", // Empty SKU
"quantity": 1,
"price": 9.99
},
{
"sku": "INVALID@SKU#123", // Invalid characters
"quantity": 2,
"price": 15.50
}
],
"total": 40.98
}
Expected Results:
- API Gateway returns 400 Bad Request
- SKU format validation alert triggered
- Invalid SKU patterns logged
3. Size and Limit Validation
3.1 Oversized Payload
Objective: Test rejection of payloads exceeding size limits
Test Method:
- Generate cart with 1000+ items (exceeding API limit)
- Submit payload larger than configured size limit (e.g., >1MB)
Expected Results:
- API Gateway returns 413 Payload Too Large
- Size limit exceeded alert triggered
- Payload size metrics logged
3.2 Empty Cart Payload
Objective: Verify handling of empty shopping carts
Test Payload:
{
"cart_id": "test-cart-007",
"items": [],
"total": 0.00
}
Expected Results:
- API Gateway returns 422 Unprocessable Entity
- Empty cart alert triggered
- Business rule violation logged
4. Authentication and Authorization Failures
4.1 Missing Authentication Headers
Objective: Test rejection due to missing auth credentials
Test Setup:
- Submit valid cart payload without authentication headers
- Remove or corrupt API key/token
Expected Results:
- API Gateway returns 401 Unauthorized
- Authentication failure alert triggered
- Security event logged
4.2 Invalid API Key
Objective: Verify rejection of invalid authentication
Test Setup:
- Submit cart with expired or invalid API key
- Use API key from different environment/tenant
Expected Results:
- API Gateway returns 403 Forbidden
- Authorization failure alert triggered
- Security violation logged
5. Rate Limiting and Throttling
5.1 Rate Limit Exceeded
Objective: Test behavior when submission rate exceeds limits
Test Method:
- Submit 100 cart payloads within 1 minute (exceeding rate limit)
- Use automated script to generate rapid requests
Expected Results:
- API Gateway returns 429 Too Many Requests
- Rate limiting alert triggered
- Throttling metrics logged
5.2 Burst Traffic Handling
Objective: Verify system behavior under sudden traffic spikes
Test Method:
- Generate 50 concurrent cart submissions
- Monitor system response and alerting
Expected Results:
- Appropriate HTTP status codes returned
- Performance degradation alerts triggered if applicable
- System remains stable
6. Error Response Validation
6.1 Error Message Format
Objective: Verify consistent error response structure
Test Method:
- Submit various invalid payloads
- Validate error response format consistency
Expected Error Response Format:
{
"error": {
"code": "VALIDATION_ERROR",
"message": "Cart payload validation failed",
"details": [
{
"field": "items[0].quantity",
"error": "must be greater than 0"
}
],
"timestamp": "2024-01-19T10:30:00Z",
"request_id": "req-12345"
}
}
6.2 Error Code Consistency
Objective: Ensure consistent error codes for similar failures
Test Cases:
- Multiple malformed JSON payloads should return same error code
- Similar validation failures should have consistent error codes
- Error codes should match API documentation
7. Alerting and Monitoring Validation
7.1 Alert Trigger Verification
Objective: Confirm alerts are triggered for all rejection scenarios
Test Method:
- Execute each test case above
- Verify corresponding alert is generated
- Check alert contains relevant context information
Alert Validation Checklist:
- Alert triggered within SLA timeframe (< 30 seconds)
- Alert contains cart_id and error details
- Alert severity matches error type
- Alert includes timestamp and request_id
7.2 Alert Escalation Testing
Objective: Test alert escalation for repeated failures
Test Method:
- Generate 10 consecutive payload validation failures
- Verify escalation rules trigger appropriately
Expected Results:
- Initial alerts for individual failures
- Escalated alert after threshold reached
- Appropriate stakeholders notified
8. Recovery and Retry Testing
8.1 Client Retry Behavior
Objective: Test system behavior with client retry attempts
Test Method:
- Submit invalid payload
- Retry same payload multiple times
- Monitor system response and alerting
Expected Results:
- Consistent rejection responses
- No duplicate processing
- Retry attempts logged appropriately
8.2 Payload Correction Testing
Objective: Verify system accepts corrected payloads
Test Method:
- Submit invalid payload (gets rejected)
- Submit corrected version of same cart
- Verify successful processing
Expected Results:
- Invalid payload rejected with alert
- Corrected payload processed successfully
- No lingering error states
Test Execution Framework
Automated Test Suite
# Example test execution commands
npm test -- --suite=payload-validation
python test_cart_validation.py --verbose
curl -X POST $API_ENDPOINT/cart -d @invalid_payload.json
Test Data Management
- Valid Payloads: Reference set of correct cart structures
- Invalid Payloads: Comprehensive set of malformed examples
- Edge Cases: Boundary conditions and unusual scenarios
Monitoring During Tests
- API Gateway metrics and logs
- Alert system notifications
- Downstream service impact
- Performance metrics
Success Criteria
- Rejection Accuracy: 100% of invalid payloads rejected appropriately
- Alert Reliability: 100% of rejections trigger alerts within SLA
- Response Consistency: Error responses follow documented format
- System Stability: No service degradation during validation failures
- Security: No sensitive data exposed in error messages
Test Environment Requirements
- API Gateway: Configured with validation rules
- Alert System: Monitoring and notification setup
- Test Data: Comprehensive invalid payload examples
- Monitoring: Logging and metrics collection enabled
- Load Testing: Tools for generating concurrent requests
