The previous xAI auto-speech-tag tests asserted on the local
pause-only fallback and only passed because call_llm silently
returns None in the test environment. They gave zero coverage of
the new auxiliary-rewrite path added in the previous commit.
Add tests that:
- mock agent.auxiliary_client.call_llm and pin down the new contract
(auxiliary rewriter output wins over the local fallback)
- verify the system prompt lists every documented inline + wrapping
tag and uses BBCode-style [/tag] closing syntax
- cover markdown-fence stripping (with and without language hint)
- exercise the local fallback on rewriter exception, empty response,
None response, and missing-choices response
- confirm call_llm is NOT invoked when the input already has
explicit speech tags, or is empty / whitespace-only
- replace the end-to-end test that asserted on the silent-fallback
output with one that mocks the rewriter and asserts the
rewriter's tagged text is what reaches the xAI TTS API
Carlos Diosdado
8ae6bd0823