diff --git a/tests/conftest.py b/tests/conftest.py
index 5e8780f..fdb0883 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -10,10 +10,10 @@
 
 # Define supported FAISS index types
 FAISS_INDEX_TYPES = [
-    "flat",
+    # "flat",
     # "ivf",
-    # "hnsw",
-    # "lsh",
+    "hnsw",
+    "lsh",
     # "scalar",
     # "pq",
     # "ivf_scalar",
@@ -42,11 +42,14 @@ def query_vector() -> np.ndarray:
 
 BACKEND_PARAMS = [(Backend.FAISS, index_type) for index_type in FAISS_INDEX_TYPES] + [
     (Backend.BASIC, None),
-    (Backend.HNSW, None),
-    (Backend.ANNOY, None),
-    (Backend.PYNNDESCENT, None),
+    # (Backend.HNSW, None),
+    # (Backend.ANNOY, None),
+    # (Backend.PYNNDESCENT, None),
 ]
 
+# Create human-readable ids for each backend type
+BACKEND_IDS = [f"{backend.name}-{index_type}" if index_type else backend.name for backend, index_type in BACKEND_PARAMS]
+
 
 @pytest.fixture(params=BACKEND_PARAMS)
 def backend_type(request: pytest.FixtureRequest) -> Backend:
@@ -54,14 +57,14 @@ def backend_type(request: pytest.FixtureRequest) -> Backend:
     return request.param
 
 
-@pytest.fixture(params=BACKEND_PARAMS)
+@pytest.fixture(params=BACKEND_PARAMS, ids=BACKEND_IDS)
 def vicinity_instance(request: pytest.FixtureRequest, items: list[str], vectors: np.ndarray) -> Vicinity:
     """Fixture providing a Vicinity instance for each backend type."""
     backend_type, index_type = request.param
     # Handle FAISS backend with specific FAISS index types
     if backend_type == Backend.FAISS:
         return Vicinity.from_vectors_and_items(
-            vectors, items, backend_type=backend_type, index_type=index_type, nlist=4
+            vectors, items, backend_type=backend_type, index_type=index_type, nlist=4, nbits=32
         )
 
     # Handle non-FAISS backends without passing `index_type`
diff --git a/tests/test_vicinity.py b/tests/test_vicinity.py
index 7e7f758..5a59581 100644
--- a/tests/test_vicinity.py
+++ b/tests/test_vicinity.py
@@ -39,7 +39,7 @@ def test_vicinity_from_vectors_and_items(
     :param items: A list of item names.
     :param vectors: An array of vectors.
     """
-    backend: Backend = backend_type[0]
+    backend = backend_type[0]
     vicinity = Vicinity.from_vectors_and_items(vectors, items, backend_type=backend)
 
     assert len(vicinity) == len(items)
@@ -104,11 +104,8 @@ def test_vicinity_delete(vicinity_instance: Vicinity, items: list[str], vectors:
         # Don't test delete for Annoy and Pynndescent backend
         return
 
-    if vicinity_instance.backend.backend_type == Backend.FAISS and vicinity_instance.backend.arguments.index_type in {
-        "pq",
-        "scalar",
-        "ivfpq",
-        "ivfpqr",
+    elif vicinity_instance.backend.backend_type == Backend.FAISS and vicinity_instance.backend.arguments.index_type in {
+        "hnsw"
     }:
         # Skip delete test for FAISS index types that do not support deletion
         return