move mock into if statement

test/test_helpers.py

@@ -168,8 +168,8 @@ class TestPrepareHost:
         with pytest.raises(OSError) as e:
             prepare_host()
         assert "unknown host 'NotExistingHostName'" in e.value.args[0]
-        mock_host.return_value = "linux-gzsx"
         if "runner-6HmDp9Qd-project-2411-concurrent" not in socket.gethostname():
+            mock_host.return_value = "linux-gzsx"
             with pytest.raises(NotADirectoryError) as e:
                 prepare_host()
             assert "does not exist for host 'linux-gzsx'" in e.value.args[0]