diff --git a/tests/test_annoyindexer.py b/tests/test_annoyindexer.py
index 66fe533b..3dde7494 100644
--- a/tests/test_annoyindexer.py
+++ b/tests/test_annoyindexer.py
@@ -4,6 +4,7 @@
 import numpy as np
 
 from gnes.indexer.chunk.annoy import AnnoyIndexer
+from gnes.indexer.chunk.numpy import NumpyIndexer
 
 
 class TestAnnoyIndexer(unittest.TestCase):
@@ -27,3 +28,19 @@ def test_search(self):
         a.close()
         a.dump()
         a.dump_yaml()
+
+    def test_numpy_indexer(self):
+        a = NumpyIndexer()
+        a.add(list(zip(list(range(10)), list(range(10)))), self.toy_data, [1.] * 10)
+        self.assertEqual(a.num_chunks, 10)
+        self.assertEqual(a.num_docs, 10)
+        top_1 = [i[0][0] for i in a.query(self.toy_data, top_k=1)]
+        self.assertEqual(top_1, list(range(10)))
+        a.close()
+        a.dump()
+        a.dump_yaml()
+        b = NumpyIndexer.load_yaml(a.yaml_full_path)
+        self.assertEqual(b.num_chunks, 10)
+        self.assertEqual(b.num_docs, 10)
+        top_1 = [i[0][0] for i in b.query(self.toy_data, top_k=1)]
+        self.assertEqual(top_1, list(range(10)))