API Testing
Overview
Create comprehensive API test suites for REST APIs. Covers endpoint testing, response validation, authentication flows, error handling, and performance benchmarks.
Test Structure
1. Setup
php
use GuzzleHttp\Client;
$client = new Client([
'base_uri' => 'https://api.example.com',
'timeout' => 30,
'headers' => ['Accept' => 'application/json'],
]);
2. Request Testing
- •Test all HTTP methods (GET, POST, PUT, PATCH, DELETE)
- •Validate request headers
- •Test query parameters
- •Test request body formats (JSON, form-data, multipart)
3. Response Validation
- •Status code verification
- •Response body schema validation
- •Header validation (Content-Type, Cache-Control, etc.)
- •Response time assertions
4. Authentication Testing
- •Valid credentials
- •Invalid credentials
- •Expired tokens
- •Missing authentication
- •Role-based access control
5. Error Handling
- •400 Bad Request (invalid input)
- •401 Unauthorized
- •403 Forbidden
- •404 Not Found
- •422 Unprocessable Entity
- •429 Too Many Requests
- •500 Internal Server Error
6. Edge Cases
- •Empty request bodies
- •Extremely large payloads
- •Special characters in parameters
- •Concurrent requests
- •Timeout scenarios
Output Format
Generate PHPUnit test classes with:
- •Descriptive test method names
- •Data providers for parameterized tests
- •setUp/tearDown for test fixtures
- •Proper assertions for each scenario