diff --git a/libs/standard-tests/langchain_standard_tests/integration_tests/vectorstores.py b/libs/standard-tests/langchain_standard_tests/integration_tests/vectorstores.py
new file mode 100644
index 0000000000..d65eb12934
--- /dev/null
+++ b/libs/standard-tests/langchain_standard_tests/integration_tests/vectorstores.py
@@ -0,0 +1,301 @@
+"""Test suite to test vectostores."""
+from abc import ABC, abstractmethod
+
+import pytest
+from langchain_core.documents import Document
+from langchain_core.embeddings.fake import DeterministicFakeEmbedding, Embeddings
+from langchain_core.vectorstores import VectorStore
+
+# Arbitrarily chosen. Using a small embedding size
+# so tests are faster and easier to debug.
+EMBEDDING_SIZE = 6
+
+
+class ReadWriteTestSuite(ABC):
+    """Test suite for checking the read-write API of a vectorstore.
+
+    This test suite verifies the basic read-write API of a vectorstore.
+
+    The test suite is designed for synchronous vectorstores.
+
+    Implementers should subclass this test suite and provide a fixture
+    that returns an empty vectorstore for each test.
+
+    The fixture should use the `get_embeddings` method to get a pre-defined
+    embeddings model that should be used for this test suite.
+    """
+
+    @abstractmethod
+    @pytest.fixture
+    def vectorstore(self) -> VectorStore:
+        """Get the vectorstore class to test.
+
+        The returned vectorstore should be EMPTY.
+        """
+
+    @staticmethod
+    def get_embeddings() -> Embeddings:
+        """A pre-defined embeddings model that should be used for this test."""
+        return DeterministicFakeEmbedding(
+            size=EMBEDDING_SIZE,
+        )
+
+    def test_vectorstore_is_empty(self, vectorstore: VectorStore) -> None:
+        """Test that the vectorstore is empty."""
+        assert vectorstore.similarity_search("foo", k=1) == []
+
+    def test_add_documents(self, vectorstore: VectorStore) -> None:
+        """Test adding documents into the vectorstore."""
+        documents = [
+            Document(page_content="foo", metadata={"id": 1}),
+            Document(page_content="bar", metadata={"id": 2}),
+        ]
+        vectorstore.add_documents(documents)
+        documents = vectorstore.similarity_search("bar", k=2)
+        assert documents == [
+            Document(page_content="bar", metadata={"id": 2}),
+            Document(page_content="foo", metadata={"id": 1}),
+        ]
+
+    def test_vectorstore_still_empty(self, vectorstore: VectorStore) -> None:
+        """This test should follow a test that adds documents.
+
+        This just verifies that the fixture is set up properly to be empty
+        after each test.
+        """
+        assert vectorstore.similarity_search("foo", k=1) == []
+
+    def test_deleting_documents(self, vectorstore: VectorStore) -> None:
+        """Test deleting documents from the vectorstore."""
+        documents = [
+            Document(page_content="foo", metadata={"id": 1}),
+            Document(page_content="bar", metadata={"id": 2}),
+        ]
+        vectorstore.add_documents(documents, ids=["1", "2"])
+        vectorstore.delete(["1"])
+        documents = vectorstore.similarity_search("foo", k=1)
+        assert documents == [Document(page_content="bar", metadata={"id": 2})]
+
+    def test_deleting_bulk_documents(self, vectorstore: VectorStore) -> None:
+        """Test that we can delete several documents at once."""
+        documents = [
+            Document(page_content="foo", metadata={"id": 1}),
+            Document(page_content="bar", metadata={"id": 2}),
+            Document(page_content="baz", metadata={"id": 3}),
+        ]
+
+        vectorstore.add_documents(documents, ids=["1", "2", "3"])
+        vectorstore.delete(["1", "2"])
+        documents = vectorstore.similarity_search("foo", k=1)
+        assert documents == [Document(page_content="baz", metadata={"id": 3})]
+
+    def test_delete_missing_content(self, vectorstore: VectorStore) -> None:
+        """Deleting missing content should not raise an exception."""
+        vectorstore.delete(["1"])
+        vectorstore.delete(["1", "2", "3"])
+
+    def test_add_documents_with_ids_is_idempotent(
+        self, vectorstore: VectorStore
+    ) -> None:
+        """Adding by ID should be idempotent."""
+        documents = [
+            Document(page_content="foo", metadata={"id": 1}),
+            Document(page_content="bar", metadata={"id": 2}),
+        ]
+        vectorstore.add_documents(documents, ids=["1", "2"])
+        vectorstore.add_documents(documents, ids=["1", "2"])
+        documents = vectorstore.similarity_search("bar", k=2)
+        assert documents == [
+            Document(page_content="bar", metadata={"id": 2}),
+            Document(page_content="foo", metadata={"id": 1}),
+        ]
+
+    def test_add_documents_without_ids_gets_duplicated(
+        self, vectorstore: VectorStore
+    ) -> None:
+        """Adding documents without specifying IDs should duplicate content."""
+        documents = [
+            Document(page_content="foo", metadata={"id": 1}),
+            Document(page_content="bar", metadata={"id": 2}),
+        ]
+
+        vectorstore.add_documents(documents)
+        vectorstore.add_documents(documents)
+        documents = vectorstore.similarity_search("bar", k=2)
+        assert documents == [
+            Document(page_content="bar", metadata={"id": 2}),
+            Document(page_content="bar", metadata={"id": 2}),
+        ]
+
+    def test_add_documents_by_id_with_mutation(self, vectorstore: VectorStore) -> None:
+        """Test that we can overwrite by ID using add_documents."""
+        documents = [
+            Document(page_content="foo", metadata={"id": 1}),
+            Document(page_content="bar", metadata={"id": 2}),
+        ]
+
+        vectorstore.add_documents(documents=documents, ids=["1", "2"])
+
+        # Now over-write content of ID 1
+        new_documents = [
+            Document(
+                page_content="new foo", metadata={"id": 1, "some_other_field": "foo"}
+            ),
+        ]
+
+        vectorstore.add_documents(documents=new_documents, ids=["1"])
+
+        # Check that the content has been updated
+        documents = vectorstore.similarity_search("new foo", k=2)
+        assert documents == [
+            Document(
+                page_content="new foo", metadata={"id": 1, "some_other_field": "foo"}
+            ),
+            Document(page_content="bar", metadata={"id": 2}),
+        ]
+
+
+class AsyncReadWriteTestSuite(ABC):
+    """Test suite for checking the **async** read-write API of a vectorstore.
+
+    This test suite verifies the basic read-write API of a vectorstore.
+
+    The test suite is designed for asynchronous vectorstores.
+
+    Implementers should subclass this test suite and provide a fixture
+    that returns an empty vectorstore for each test.
+
+    The fixture should use the `get_embeddings` method to get a pre-defined
+    embeddings model that should be used for this test suite.
+    """
+
+    @abstractmethod
+    @pytest.fixture
+    async def vectorstore(self) -> VectorStore:
+        """Get the vectorstore class to test.
+
+        The returned vectorstore should be EMPTY.
+        """
+
+    @staticmethod
+    def get_embeddings() -> Embeddings:
+        """A pre-defined embeddings model that should be used for this test."""
+        return DeterministicFakeEmbedding(
+            size=EMBEDDING_SIZE,
+        )
+
+    async def test_vectorstore_is_empty(self, vectorstore: VectorStore) -> None:
+        """Test that the vectorstore is empty."""
+        assert await vectorstore.asimilarity_search("foo", k=1) == []
+
+    async def test_add_documents(self, vectorstore: VectorStore) -> None:
+        """Test adding documents into the vectorstore."""
+        documents = [
+            Document(page_content="foo", metadata={"id": 1}),
+            Document(page_content="bar", metadata={"id": 2}),
+        ]
+        await vectorstore.aadd_documents(documents)
+        documents = await vectorstore.asimilarity_search("bar", k=2)
+        assert documents == [
+            Document(page_content="bar", metadata={"id": 2}),
+            Document(page_content="foo", metadata={"id": 1}),
+        ]
+
+    async def test_vectorstore_still_empty(self, vectorstore: VectorStore) -> None:
+        """This test should follow a test that adds documents.
+
+        This just verifies that the fixture is set up properly to be empty
+        after each test.
+        """
+        assert await vectorstore.asimilarity_search("foo", k=1) == []
+
+    async def test_deleting_documents(self, vectorstore: VectorStore) -> None:
+        """Test deleting documents from the vectorstore."""
+        documents = [
+            Document(page_content="foo", metadata={"id": 1}),
+            Document(page_content="bar", metadata={"id": 2}),
+        ]
+        await vectorstore.aadd_documents(documents, ids=["1", "2"])
+        await vectorstore.adelete(["1"])
+        documents = await vectorstore.asimilarity_search("foo", k=1)
+        assert documents == [Document(page_content="bar", metadata={"id": 2})]
+
+    async def test_deleting_bulk_documents(self, vectorstore: VectorStore) -> None:
+        """Test that we can delete several documents at once."""
+        documents = [
+            Document(page_content="foo", metadata={"id": 1}),
+            Document(page_content="bar", metadata={"id": 2}),
+            Document(page_content="baz", metadata={"id": 3}),
+        ]
+
+        await vectorstore.aadd_documents(documents, ids=["1", "2", "3"])
+        await vectorstore.adelete(["1", "2"])
+        documents = await vectorstore.asimilarity_search("foo", k=1)
+        assert documents == [Document(page_content="baz", metadata={"id": 3})]
+
+    async def test_delete_missing_content(self, vectorstore: VectorStore) -> None:
+        """Deleting missing content should not raise an exception."""
+        await vectorstore.adelete(["1"])
+        await vectorstore.adelete(["1", "2", "3"])
+
+    async def test_add_documents_with_ids_is_idempotent(
+        self, vectorstore: VectorStore
+    ) -> None:
+        """Adding by ID should be idempotent."""
+        documents = [
+            Document(page_content="foo", metadata={"id": 1}),
+            Document(page_content="bar", metadata={"id": 2}),
+        ]
+        await vectorstore.aadd_documents(documents, ids=["1", "2"])
+        await vectorstore.aadd_documents(documents, ids=["1", "2"])
+        documents = await vectorstore.asimilarity_search("bar", k=2)
+        assert documents == [
+            Document(page_content="bar", metadata={"id": 2}),
+            Document(page_content="foo", metadata={"id": 1}),
+        ]
+
+    async def test_add_documents_without_ids_gets_duplicated(
+        self, vectorstore: VectorStore
+    ) -> None:
+        """Adding documents without specifying IDs should duplicate content."""
+        documents = [
+            Document(page_content="foo", metadata={"id": 1}),
+            Document(page_content="bar", metadata={"id": 2}),
+        ]
+
+        await vectorstore.aadd_documents(documents)
+        await vectorstore.aadd_documents(documents)
+        documents = await vectorstore.asimilarity_search("bar", k=2)
+        assert documents == [
+            Document(page_content="bar", metadata={"id": 2}),
+            Document(page_content="bar", metadata={"id": 2}),
+        ]
+
+    async def test_add_documents_by_id_with_mutation(
+        self, vectorstore: VectorStore
+    ) -> None:
+        """Test that we can overwrite by ID using add_documents."""
+        documents = [
+            Document(page_content="foo", metadata={"id": 1}),
+            Document(page_content="bar", metadata={"id": 2}),
+        ]
+
+        await vectorstore.aadd_documents(documents=documents, ids=["1", "2"])
+
+        # Now over-write content of ID 1
+        new_documents = [
+            Document(
+                page_content="new foo", metadata={"id": 1, "some_other_field": "foo"}
+            ),
+        ]
+
+        await vectorstore.aadd_documents(documents=new_documents, ids=["1"])
+
+        # Check that the content has been updated
+        documents = await vectorstore.asimilarity_search("new foo", k=2)
+        assert documents == [
+            Document(
+                page_content="new foo", metadata={"id": 1, "some_other_field": "foo"}
+            ),
+            Document(page_content="bar", metadata={"id": 2}),
+        ]
diff --git a/libs/standard-tests/tests/unit_tests/__init__.py b/libs/standard-tests/tests/unit_tests/__init__.py
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/libs/standard-tests/tests/unit_tests/test_in_memory_vectorstore.py b/libs/standard-tests/tests/unit_tests/test_in_memory_vectorstore.py
new file mode 100644
index 0000000000..d34bf25c38
--- /dev/null
+++ b/libs/standard-tests/tests/unit_tests/test_in_memory_vectorstore.py
@@ -0,0 +1,28 @@
+import pytest
+from langchain_core.vectorstores import VectorStore
+
+from langchain_standard_tests.integration_tests.vectorstores import (
+    AsyncReadWriteTestSuite,
+    ReadWriteTestSuite,
+)
+
+# We'll need to move this dependency to core
+pytest.importorskip("langchain_community")
+
+from langchain_community.vectorstores.inmemory import (  # type: ignore # noqa
+    InMemoryVectorStore,
+)
+
+
+class TestInMemoryVectorStore(ReadWriteTestSuite):
+    @pytest.fixture
+    def vectorstore(self) -> VectorStore:
+        embeddings = self.get_embeddings()
+        return InMemoryVectorStore(embedding=embeddings)
+
+
+class TestAysncInMemoryVectorStore(AsyncReadWriteTestSuite):
+    @pytest.fixture
+    async def vectorstore(self) -> VectorStore:
+        embeddings = self.get_embeddings()
+        return InMemoryVectorStore(embedding=embeddings)