fix: better test coverage

tests/unit/test_router.py

@@ -272,6 +272,23 @@ class TestSemanticRouter:
         assert route_layer.score_threshold == openai_encoder.score_threshold
         if index_cls is PineconeIndex:
             time.sleep(PINECONE_SLEEP)  # allow for index to be updated
+        _ = route_layer("Hello")
+        assert len(route_layer.index.get_utterances()) == 6
+
+    def test_init_and_add_single_utterance(
+        self, route_single_utterance, openai_encoder, index_cls
+    ):
+        index = init_index(index_cls)
+        route_layer = SemanticRouter(
+            encoder=openai_encoder,
+            index=index,
+            auto_sync="local",
+        )
+        if index_cls is PineconeIndex:
+            time.sleep(PINECONE_SLEEP)  # allow for index to be updated
+        route_layer.add(routes=[route_single_utterance])
+        assert route_layer.score_threshold == openai_encoder.score_threshold
+        _ = route_layer("Hello")
         assert len(route_layer.index.get_utterances()) == 1
 
     def test_delete_index(self, openai_encoder, routes, index_cls):