CodeRabbit Generated Unit Tests: Add unit tests and update LLM adapters and types

[coderabbitai]

Unit test generation was requested by @dev-dami.

• feat: Improve OpenAI LLM adapter and types #7 (comment)

The following files were modified:

• tests/llms-base.test.ts
• tests/llms-openai.test.ts
• tests/types.test.ts

[coderabbitai]

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