- Add 111 unit tests covering all client classes and exceptions
- Test BaseClientMixin: initialization, validation, retry logic
- Test FastGPTClient: HTTP requests, streaming, error handling, context manager
- Test ChatClient: all chat operations (completion, histories, records, feedback)
- Test AppClient: app analytics and logs
- Test all exception classes with various configurations
- Add shared pytest fixtures in conftest.py
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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
