API Testing

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

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

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