fix: getting back the test case for pgvector engine!

getting it back from main branch but just a couple of renames

tests/unit/test_base_pg_engine.py

@@ -0,0 +1,24 @@
+from unittest import TestCase
+
+from utils.query_engine.base_pg_engine import BasePGEngine
+
+
+class TestPGBaseEngine(TestCase):
+    def test_setup_vector_store_index(self):
+        """
+        Tests that _setup_vector_store_index creates a PGVectorAccess object
+        and calls its load_index method.
+        """
+        platform_table_name = "test_table"
+        community_id = "123456"
+        base_engine = BasePGEngine(
+            platform_name=platform_table_name,
+            community_id=community_id,
+        )
+        base_engine = base_engine._setup_vector_store_index(
+            testing=True,
+        )
+
+        expected_dbname = f"community_{community_id}"
+        self.assertIn(expected_dbname, base_engine.vector_store.connection_string)
+        self.assertEqual(base_engine.vector_store.table_name, platform_table_name)