standard-tests: add override check (#24407)

libs/partners/groq/tests/unit_tests/test_standard.py

@@ -2,12 +2,10 @@
 
 from typing import Type
 
+import pytest
 from langchain_core.language_models import BaseChatModel
-from langchain_core.runnables import RunnableBinding
-from langchain_standard_tests.unit_tests.chat_models import (  # type: ignore[import-not-found]
+from langchain_standard_tests.unit_tests.chat_models import (
     ChatModelUnitTests,
-    Person,
-    my_adder_tool,
 )
 
 from langchain_groq import ChatGroq
@@ -18,10 +16,6 @@ class TestGroqStandard(ChatModelUnitTests):
     def chat_model_class(self) -> Type[BaseChatModel]:
         return ChatGroq
 
+    @pytest.mark.xfail(reason="Groq does not support tool_choice='any'")
     def test_bind_tool_pydantic(self, model: BaseChatModel) -> None:
-        """Does not currently support tool_choice='any'."""
-        if not self.has_tool_calling:
-            return
-
-        tool_model = model.bind_tools([Person, Person.schema(), my_adder_tool])
-        assert isinstance(tool_model, RunnableBinding)
+        super().test_bind_tool_pydantic(model)

libs/partners/openai/tests/unit_tests/chat_models/test_azure_standard.py

@@ -2,10 +2,9 @@
 
 from typing import Type
 
+import pytest
 from langchain_core.language_models import BaseChatModel
-from langchain_core.runnables import RunnableBinding
 from langchain_standard_tests.unit_tests import ChatModelUnitTests
-from langchain_standard_tests.unit_tests.chat_models import Person, my_adder_tool
 
 from langchain_openai import AzureChatOpenAI
 
@@ -23,10 +22,6 @@ class TestOpenAIStandard(ChatModelUnitTests):
             "azure_endpoint": "https://test.azure.com",
         }
 
+    @pytest.mark.xfail(reason="AzureOpenAI does not support tool_choice='any'")
     def test_bind_tool_pydantic(self, model: BaseChatModel) -> None:
-        """Does not currently support tool_choice='any'."""
-        if not self.has_tool_calling:
-            return
-
-        tool_model = model.bind_tools([Person, Person.schema(), my_adder_tool])
-        assert isinstance(tool_model, RunnableBinding)
+        super().test_bind_tool_pydantic(model)

libs/standard-tests/langchain_standard_tests/base.py

@@ -0,0 +1,66 @@
+from abc import ABC
+from typing import Type
+
+
+class BaseStandardTests(ABC):
+    def test_no_overrides_DO_NOT_OVERRIDE(self) -> None:
+        """
+        Test that no standard tests are overridden.
+        """
+        # find path to standard test implementations
+        comparison_class = None
+
+        def explore_bases(cls: Type) -> None:
+            nonlocal comparison_class
+            for base in cls.__bases__:
+                if base.__module__.startswith("langchain_standard_tests."):
+                    if comparison_class is None:
+                        comparison_class = base
+                    else:
+                        raise ValueError(
+                            "Multiple standard test base classes found: "
+                            f"{comparison_class}, {base}"
+                        )
+                else:
+                    explore_bases(base)
+
+        explore_bases(self.__class__)
+        assert comparison_class is not None, "No standard test base class found."
+
+        print(f"Comparing {self.__class__} to {comparison_class}")  # noqa: T201
+
+        running_tests = set(
+            [method for method in dir(self) if method.startswith("test_")]
+        )
+        base_tests = set(
+            [method for method in dir(comparison_class) if method.startswith("test_")]
+        )
+        non_standard_tests = running_tests - base_tests
+        assert not non_standard_tests, f"Non-standard tests found: {non_standard_tests}"
+        deleted_tests = base_tests - running_tests
+        assert not deleted_tests, f"Standard tests deleted: {deleted_tests}"
+
+        overridden_tests = [
+            method
+            for method in running_tests
+            if getattr(self.__class__, method) is not getattr(comparison_class, method)
+        ]
+
+        def is_xfail(method: str) -> bool:
+            m = getattr(self.__class__, method)
+            if not hasattr(m, "pytestmark"):
+                return False
+            marks = m.pytestmark
+            return any(
+                mark.name == "xfail" and mark.kwargs.get("reason") for mark in marks
+            )
+
+        overridden_not_xfail = [
+            method for method in overridden_tests if not is_xfail(method)
+        ]
+        assert not overridden_not_xfail, (
+            "Standard tests overridden without "
+            f'@pytest.mark.xfail(reason="..."): {overridden_not_xfail}\n'
+            "Note: reason is required to explain why the standard test has an expected "
+            "failure."
+        )

libs/standard-tests/langchain_standard_tests/integration_tests/base_store.py

@@ -1,13 +1,15 @@
-from abc import ABC, abstractmethod
+from abc import abstractmethod
 from typing import AsyncGenerator, Generator, Generic, Tuple, TypeVar
 
 import pytest
 from langchain_core.stores import BaseStore
 
+from langchain_standard_tests.base import BaseStandardTests
+
 V = TypeVar("V")
 
 
-class BaseStoreSyncTests(ABC, Generic[V]):
+class BaseStoreSyncTests(BaseStandardTests, Generic[V]):
     """Test suite for checking the key-value API of a BaseStore.
 
     This test suite verifies the basic key-value API of a BaseStore.
@@ -138,7 +140,7 @@ class BaseStoreSyncTests(ABC, Generic[V]):
         assert sorted(kv_store.yield_keys(prefix="foo")) == ["foo"]
 
 
-class BaseStoreAsyncTests(ABC):
+class BaseStoreAsyncTests(BaseStandardTests):
     """Test suite for checking the key-value API of a BaseStore.
 
     This test suite verifies the basic key-value API of a BaseStore.

libs/standard-tests/langchain_standard_tests/integration_tests/cache.py

@@ -1,11 +1,13 @@
-from abc import ABC, abstractmethod
+from abc import abstractmethod
 
 import pytest
 from langchain_core.caches import BaseCache
 from langchain_core.outputs import Generation
 
+from langchain_standard_tests.base import BaseStandardTests
 
-class SyncCacheTestSuite(ABC):
+
+class SyncCacheTestSuite(BaseStandardTests):
     """Test suite for checking the BaseCache API of a caching layer for LLMs.
 
     This test suite verifies the basic caching API of a caching layer for LLMs.
@@ -95,7 +97,7 @@ class SyncCacheTestSuite(ABC):
         assert cache.lookup(prompt, llm_string) == generations
 
 
-class AsyncCacheTestSuite(ABC):
+class AsyncCacheTestSuite(BaseStandardTests):
     """Test suite for checking the BaseCache API of a caching layer for LLMs.
 
     This test suite verifies the basic caching API of a caching layer for LLMs.

libs/standard-tests/langchain_standard_tests/integration_tests/vectorstores.py

@@ -1,19 +1,21 @@
 """Test suite to test vectostores."""
 
 import inspect
-from abc import ABC, abstractmethod
+from abc import abstractmethod
 
 import pytest
 from langchain_core.documents import Document
 from langchain_core.embeddings.fake import DeterministicFakeEmbedding, Embeddings
 from langchain_core.vectorstores import VectorStore
 
+from langchain_standard_tests.base import BaseStandardTests
+
 # Arbitrarily chosen. Using a small embedding size
 # so tests are faster and easier to debug.
 EMBEDDING_SIZE = 6
 
 
-class ReadWriteTestSuite(ABC):
+class ReadWriteTestSuite(BaseStandardTests):
     """Test suite for checking the read-write API of a vectorstore.
 
     This test suite verifies the basic read-write API of a vectorstore.
@@ -201,7 +203,7 @@ class ReadWriteTestSuite(ABC):
         assert "ids" not in signature.parameters
 
 
-class AsyncReadWriteTestSuite(ABC):
+class AsyncReadWriteTestSuite(BaseStandardTests):
     """Test suite for checking the **async** read-write API of a vectorstore.
 
     This test suite verifies the basic read-write API of a vectorstore.

libs/standard-tests/langchain_standard_tests/unit_tests/chat_models.py

@@ -1,5 +1,6 @@
 """Unit tests for chat models."""
-from abc import ABC, abstractmethod
+
+from abc import abstractmethod
 from typing import Any, List, Literal, Optional, Type
 
 import pytest
@@ -8,6 +9,7 @@ from langchain_core.pydantic_v1 import BaseModel, Field
 from langchain_core.runnables import RunnableBinding
 from langchain_core.tools import tool
 
+from langchain_standard_tests.base import BaseStandardTests
 from langchain_standard_tests.utils.pydantic import PYDANTIC_MAJOR_VERSION
 
 
@@ -64,7 +66,7 @@ def my_adder(a: int, b: int) -> int:
     return a + b
 
 
-class ChatModelTests(ABC):
+class ChatModelTests(BaseStandardTests):
     @property
     @abstractmethod
     def chat_model_class(self) -> Type[BaseChatModel]: