🧪 Testing: Add unit tests, integration tests, and test coverage

[ManvithGopu13]

Missing Test Coverage

Current State:

• ❌ No test files
• ❌ No test framework setup
• ❌ No CI/CD testing
• ❌ No test coverage reports

Required Tests:

1. Unit Tests:

   • Test each route handler with mock requests
   • Test image/audio/video generation functions
   • Test error handling
   • Test input validation

2. Integration Tests:

   • Test full request/response cycles
   • Test API endpoints end-to-end
   • Test file generation and retrieval

3. Edge Cases:

   • Invalid inputs
   • Missing parameters
   • Large file handling
   • Timeout scenarios
   • Error conditions

4. Test Framework Setup:

   • Choose testing framework (pytest recommended)
   • Add test configuration
   • Set up test fixtures
   • Add test data/mocks

5. CI/CD Integration:

   • Run tests on PR/push
   • Generate coverage reports
   • Fail builds on test failures

Recommended Structure:

tests/
  ├── unit/
  │   ├── test_routes.py
  │   ├── test_functions.py
  │   └── test_validation.py
  ├── integration/
  │   └── test_api.py
  └── conftest.py

Priority: Medium
Type: Testing