Add check for db setup

Author: sameshl

hydrus/tests/conftest.py

@@ -218,7 +218,15 @@ def init_db_for_crud_tests(drone_doc, session, engine):
     Drone Api test HydraDoc object.
     """
     test_classes, test_properties = get_doc_classes_and_properties(drone_doc)
-    create_database_tables(test_classes)
+    try:
+        create_database_tables(test_classes)
+    except Exception:
+        # catch error when the tables have been already defined.
+        # happens when /test_socket.py is run after /test_app.py
+        # in the same session
+        # in that case, no need to create the tables again on the
+        # same sqlalchemy.ext.declarative.declarative_base instance
+        pass
     Base.metadata.create_all(engine)