mirror of
https://github.com/hwchase17/langchain
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79 lines
2.3 KiB
Markdown
79 lines
2.3 KiB
Markdown
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# langchain-standard-tests
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This is an INTERNAL library for the LangChain project. It contains the base classes for
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a standard set of tests.
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## Installation
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This package will NOT be regularly published to pypi. It is intended to be installed
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directly from github at test time.
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Pip:
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```bash
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pip install git+https://github.com/langchain-ai/langchain.git#subdirectory=libs/standard-tests
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```
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Poetry:
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```bash
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poetry add git+https://github.com/langchain-ai/langchain.git#subdirectory=libs/standard-tests
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```
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## Usage
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To add standard tests to an integration package's e.g. ChatModel, you need to create
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1. A unit test class that inherits from ChatModelUnitTests
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2. An integration test class that inherits from ChatModelIntegrationTests
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`tests/unit_tests/test_standard.py`:
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```python
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"""Standard LangChain interface tests"""
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from typing import Type
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import pytest
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from langchain_core.language_models import BaseChatModel
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from langchain_standard_tests.unit_tests import ChatModelUnitTests
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from langchain_parrot_chain import ChatParrotChain
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class TestParrotChainStandard(ChatModelUnitTests):
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@pytest.fixture
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def chat_model_class(self) -> Type[BaseChatModel]:
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return ChatParrotChain
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```
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`tests/integration_tests/test_standard.py`:
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```python
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"""Standard LangChain interface tests"""
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from typing import Type
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import pytest
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from langchain_core.language_models import BaseChatModel
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from langchain_standard_tests.integration_tests import ChatModelIntegrationTests
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from langchain_parrot_chain import ChatParrotChain
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class TestParrotChainStandard(ChatModelIntegrationTests):
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@pytest.fixture
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def chat_model_class(self) -> Type[BaseChatModel]:
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return ChatParrotChain
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```
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## Reference
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The following fixtures are configurable in the test classes. Anything not marked
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as required is optional.
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- `chat_model_class` (required): The class of the chat model to be tested
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- `chat_model_params`: The keyword arguments to pass to the chat model constructor
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- `chat_model_has_tool_calling`: Whether the chat model can call tools. By default, this is set to `hasattr(chat_model_class, 'bind_tools)`
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- `chat_model_has_structured_output`: Whether the chat model can structured output. By default, this is set to `hasattr(chat_model_class, 'with_structured_output')`
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