diff --git a/libs/core/tests/unit_tests/stores/test_in_memory.py b/libs/core/tests/unit_tests/stores/test_in_memory.py
index d664954f6b..6c2346e393 100644
--- a/libs/core/tests/unit_tests/stores/test_in_memory.py
+++ b/libs/core/tests/unit_tests/stores/test_in_memory.py
@@ -1,6 +1,35 @@
+from typing import Tuple
+
+import pytest
+from langchain_standard_tests.integration_tests.base_store import (
+    BaseStoreAsyncTests,
+    BaseStoreSyncTests,
+)
+
 from langchain_core.stores import InMemoryStore
 
 
+# Check against standard tests
+class TestSyncInMemoryStore(BaseStoreSyncTests):
+    @pytest.fixture
+    def kv_store(self) -> InMemoryStore:
+        return InMemoryStore()
+
+    @pytest.fixture
+    def three_values(self) -> Tuple[str, str, str]:  # type: ignore
+        return "value1", "value2", "value3"
+
+
+class TestAsyncInMemoryStore(BaseStoreAsyncTests):
+    @pytest.fixture
+    async def kv_store(self) -> InMemoryStore:
+        return InMemoryStore()
+
+    @pytest.fixture
+    def three_values(self) -> Tuple[str, str, str]:  # type: ignore
+        return "value1", "value2", "value3"
+
+
 def test_mget() -> None:
     store = InMemoryStore()
     store.mset([("key1", "value1"), ("key2", "value2")])
diff --git a/libs/standard-tests/langchain_standard_tests/integration_tests/__init__.py b/libs/standard-tests/langchain_standard_tests/integration_tests/__init__.py
index dbf12101d1..f304bff238 100644
--- a/libs/standard-tests/langchain_standard_tests/integration_tests/__init__.py
+++ b/libs/standard-tests/langchain_standard_tests/integration_tests/__init__.py
@@ -1,3 +1,21 @@
+# ruff: noqa: E402
+import pytest
+
+# Rewrite assert statements for test suite so that implementations can
+# see the full error message from failed asserts.
+# https://docs.pytest.org/en/7.1.x/how-to/writing_plugins.html#assertion-rewriting
+modules = [
+    "base_store",
+    "cache",
+    "chat_models",
+    "vectorstores",
+]
+
+for module in modules:
+    pytest.register_assert_rewrite(
+        f"langchain_standard_tests.integration_tests.{module}"
+    )
+
 from langchain_standard_tests.integration_tests.chat_models import (
     ChatModelIntegrationTests,
 )
diff --git a/libs/standard-tests/langchain_standard_tests/integration_tests/vectorstores.py b/libs/standard-tests/langchain_standard_tests/integration_tests/vectorstores.py
index 4e9dc90505..83770099ab 100644
--- a/libs/standard-tests/langchain_standard_tests/integration_tests/vectorstores.py
+++ b/libs/standard-tests/langchain_standard_tests/integration_tests/vectorstores.py
@@ -1,4 +1,5 @@
 """Test suite to test vectostores."""
+
 import inspect
 from abc import ABC, abstractmethod
 
diff --git a/libs/standard-tests/langchain_standard_tests/unit_tests/__init__.py b/libs/standard-tests/langchain_standard_tests/unit_tests/__init__.py
index eabff172d4..418330b5dc 100644
--- a/libs/standard-tests/langchain_standard_tests/unit_tests/__init__.py
+++ b/libs/standard-tests/langchain_standard_tests/unit_tests/__init__.py
@@ -1,3 +1,16 @@
+# ruff: noqa: E402
+import pytest
+
+# Rewrite assert statements for test suite so that implementations can
+# see the full error message from failed asserts.
+# https://docs.pytest.org/en/7.1.x/how-to/writing_plugins.html#assertion-rewriting
+modules = [
+    "chat_models",
+]
+
+for module in modules:
+    pytest.register_assert_rewrite(f"langchain_standard_tests.unit_tests.{module}")
+
 from langchain_standard_tests.unit_tests.chat_models import ChatModelUnitTests
 
 __all__ = ["ChatModelUnitTests"]
diff --git a/libs/standard-tests/tests/unit_tests/test_in_memory_base_store.py b/libs/standard-tests/tests/unit_tests/test_in_memory_base_store.py
index 245b096554..5171c14c16 100644
--- a/libs/standard-tests/tests/unit_tests/test_in_memory_base_store.py
+++ b/libs/standard-tests/tests/unit_tests/test_in_memory_base_store.py
@@ -1,4 +1,5 @@
 """Tests for the InMemoryStore class."""
+
 from typing import Tuple
 
 import pytest