test: update tests for new behavior

tests/test_main.py

@@ -40,7 +40,7 @@ def test_parse_args_backtesting(mocker) -> None:
     assert backtesting_mock.call_count == 1
     call_args = backtesting_mock.call_args[0][0]
     assert call_args["config"] == ["config.json"]
-    assert call_args["verbosity"] == 0
+    assert call_args["verbosity"] is None
     assert call_args["command"] == "backtesting"
     assert call_args["func"] is not None
     assert callable(call_args["func"])
@@ -57,7 +57,7 @@ def test_main_start_hyperopt(mocker) -> None:
     assert hyperopt_mock.call_count == 1
     call_args = hyperopt_mock.call_args[0][0]
     assert call_args["config"] == ["config.json"]
-    assert call_args["verbosity"] == 0
+    assert call_args["verbosity"] is None
     assert call_args["command"] == "hyperopt"
     assert call_args["func"] is not None
     assert callable(call_args["func"])