test: Add basic testing for wallet groups

test/functional/test_runner.py

@@ -105,6 +105,7 @@ BASE_SCRIPTS = [
     'rpc_users.py',
     'feature_proxy.py',
     'rpc_signrawtransaction.py',
+    'wallet_groups.py',
     'p2p_disconnect_ban.py',
     'rpc_decodescript.py',
     'rpc_blockchain.py',