test_sha256_encoder() — langchain Function Reference

Architecture documentation for the test_sha256_encoder() function in test_caching.py from the langchain codebase.

Function python LangChainCore ApiManagement calls 1

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LangChainCore→ ApiManagement→ test_sha256_encoder() — langchain Function Reference

Dependency Diagram

graph TD
  ac739b9d_ae55_f1db_6fe8_be4fc05c1cdc["test_sha256_encoder()"]
  6b1a1e58_d1bc_2756_cc7d_9c01f64a73a2["test_caching.py"]
  ac739b9d_ae55_f1db_6fe8_be4fc05c1cdc -->|defined in| 6b1a1e58_d1bc_2756_cc7d_9c01f64a73a2
  612e991b_9f93_9ffa_30df_6f17578ea52c["embed_documents()"]
  ac739b9d_ae55_f1db_6fe8_be4fc05c1cdc -->|calls| 612e991b_9f93_9ffa_30df_6f17578ea52c
  style ac739b9d_ae55_f1db_6fe8_be4fc05c1cdc fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/langchain/tests/unit_tests/embeddings/test_caching.py lines 180–196

def test_sha256_encoder() -> None:
    """Test that the sha256 encoder is used to encode keys in the cache store."""
    store = InMemoryStore()
    emb = MockEmbeddings()
    cbe = CacheBackedEmbeddings.from_bytes_store(
        emb,
        store,
        namespace="ns_",
        key_encoder="sha256",
    )

    text = "foo"
    cbe.embed_documents([text])

    # rebuild the key exactly as the library does
    expected_key = "ns_" + hashlib.sha256(text.encode()).hexdigest()
    assert list(cbe.document_embedding_store.yield_keys()) == [expected_key]