adding LLMMessagesRouter docstring to CI tests

[davidsbatista]

Related Issues

• fixes #issue-number

Proposed Changes:

How did you test it?

Notes for the reviewer

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• I have read the contributors guidelines and the code of conduct.
• I have updated the related issue with new insights and changes.
• I have added unit tests and updated the docstrings.
• I've used one of the conventional commit types for my PR title: fix:, feat:, build:, chore:, ci:, docs:, style:, refactor:, perf:, test: and added ! in case the PR includes breaking changes.
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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
haystack-docs	Ignored	Preview	Apr 2, 2026 4:04pm

[coveralls]

Pull Request Test Coverage Report for Build 23909790699

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 92.86%

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Totals
Change from base Build 23904387626:	0.0%
Covered Lines:	15919
Relevant Lines:	17143

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💛 - Coveralls

[davidsbatista]

• TransformersZeroShotTextRouter — haystack/components/routers/zero_shot_text_router.py:26
• TransformersTextRouter — haystack/components/routers/transformers_text_router.py:25
• LLMDocumentContentExtractor — haystack/components/extractors/image/llm_document_content_extractor.py:80
• NamedEntityExtractor — haystack/components/extractors/named_entity_extractor.py:91
• LLMMessagesRouter — haystack/components/routers/llm_messages_router.py:23
• HuggingFaceLocalGenerator — haystack/components/generators/hugging_face_local.py:32
• AzureOpenAIGenerator — haystack/components/generators/azure.py:36
• HuggingFaceAPIGenerator — haystack/components/generators/hugging_face_api.py:53,67,84
• AzureOpenAIResponsesChatGenerator — haystack/components/generators/chat/azure_responses.py:37
• TransformersSimilarityRanker — haystack/components/rankers/transformers_similarity.py:38
• DocumentToImageContent — haystack/components/converters/image/document_to_image.py:37
• FileToFileContent — haystack/components/converters/file_to_file_content.py:25
• LocalWhisperTranscriber — haystack/components/audio/whisper_local.py:43
• SentenceTransformersSparseDocumentEmbedder — haystack/components/embedders/sentence_transformers_sparse_document_embedder.py:28
• HuggingFaceAPIDocumentEmbedder — haystack/components/embedders/hugging_face_api_document_embedder.py:39,58,77
• AzureOCRDocumentConverter — haystack/components/converters/azure.py:41
• AzureOpenAIChatGenerator — haystack/components/generators/chat/azure.py:45
• SentenceTransformersSparseTextEmbedder — haystack/components/embedders/sentence_transformers_sparse_text_embedder.py:25
• SentenceTransformersDocumentEmbedder — haystack/components/embedders/sentence_transformers_document_embedder.py:28
• HuggingFaceAPIChatGenerator — haystack/components/generators/chat/hugging_face_api.py:266,290,317,335
• SentenceTransformersDiversityRanker — haystack/components/rankers/sentence_transformers_diversity.py:102
• HuggingFaceAPITextEmbedder — haystack/components/embedders/hugging_face_api_text_embedder.py:32,47,61
• OpenAITextEmbedder — haystack/components/embedders/openai_text_embedder.py:24
• SentenceTransformersDocumentImageEmbedder — haystack/components/embedders/image/sentence_transformers_doc_image_embedder.py:35
• OpenAIDocumentEmbedder — haystack/components/embedders/openai_document_embedder.py:27
• AzureOpenAIDocumentEmbedder — haystack/components/embedders/azure_document_embedder.py:24
• SentenceTransformersTextEmbedder — haystack/components/embedders/sentence_transformers_text_embedder.py:24
• HuggingFaceTEIRanker — haystack/components/rankers/hugging_face_tei.py:39
• AzureOpenAITextEmbedder — haystack/components/embedders/azure_text_embedder.py:22
• request_with_retry — haystack/utils/requests_utils.py:22

[anakin87]

I'd exclude some of them

• HuggingFaceLocalGenerator and HuggingFaceLocalChatGenerato: heavy and slow generative models on CPU
• TikaDocumentConverter: requires Tika docker container running

A few others I'm unsure about

• NamedEntityExtractor: might require spacy that is not available in the test environment (it's on e2e only)
• LocalWhisperTranscriber: might be slow on CPU but it's worth trying