tests/embeddings/test_gemini_emeddings.py has a typo in its name. #6095
reported it as a duplicate of test_gemini_embeddings.py, but the
correctly-spelled file has never existed in this repo, so the typo file is
the only Gemini embeddings coverage there is. Renaming keeps all 119 lines;
deleting it would drop the suite.
mem0/embeddings/langchain.py had no tests at all. Adds five covering the
model-instance validation, the missing-model guard, and embed() delegating
to embed_query, mirroring tests/llms/test_langchain.py including its
importorskip guard.
Closes#6095
kartik-mem0
83f2d23ddb