test invalid client type

langchain_weaviate/vectorstores.py

@@ -100,8 +100,7 @@ def __init__(
 
         if not isinstance(client, weaviate.WeaviateClient):
             raise ValueError(
-                "client should be an instance of "
-                "weaviate.WeaviateClient, got {type(client)}"
+                f"client should be an instance of weaviate.WeaviateClient, got {type(client)}"
             )
         self._client = client
         self._index_name = index_name or f"LangChain_{uuid4().hex}"

tests/integration_tests/test_vectorstores.py

@@ -590,3 +590,21 @@ def test_search_with_multi_tenancy(
         ValueError, match="has multi-tenancy enabled, but request was without tenant"
     ):
         docsearch.similarity_search("foo", k=1)
+
+
+def test_invalid_client_type():
+    with pytest.raises(ValueError) as excinfo:
+        invalid_client = "invalid_client"
+        index_name = "test_index"
+        text_key = "text"
+
+        WeaviateVectorStore(
+            client=invalid_client,
+            index_name=index_name,
+            text_key=text_key,
+        )
+
+    assert (
+        str(excinfo.value)
+        == "client should be an instance of weaviate.WeaviateClient, got <class 'str'>"
+    )