langchain/libs/community/tests/integration_tests/llms/test_google_palm.py

"""Test Google PaLM Text API wrapper.

Note: This test must be run with the GOOGLE_API_KEY environment variable set to a
      valid API key.
"""

from pathlib import Path

from langchain_core.outputs import LLMResult

from langchain_community.llms.google_palm import GooglePalm
from langchain_community.llms.loading import load_llm


def test_google_palm_call() -> None:
    """Test valid call to Google PaLM text API."""
    llm = GooglePalm(max_output_tokens=10)
    output = llm("Say foo:")
    assert isinstance(output, str)
    assert llm._llm_type == "google_palm"
    assert llm.model_name == "models/text-bison-001"


def test_google_palm_generate() -> None:
    llm = GooglePalm(temperature=0.3, n=2)
    output = llm.generate(["Say foo:"])
    assert isinstance(output, LLMResult)
    assert len(output.generations) == 1
    assert len(output.generations[0]) == 2


def test_google_palm_get_num_tokens() -> None:
    llm = GooglePalm()
    output = llm.get_num_tokens("How are you?")
    assert output == 4


def test_saving_loading_llm(tmp_path: Path) -> None:
    """Test saving/loading a Google PaLM LLM."""
    llm = GooglePalm(max_output_tokens=10)
    llm.save(file_path=tmp_path / "google_palm.yaml")
    loaded_llm = load_llm(tmp_path / "google_palm.yaml")
    assert loaded_llm == llm