docstr: Test that params list passed is not modified
docstr_tok: ["Test","that","params","list","passed","is","not","modified"]
code: def test_params_unchanged(self, space):
      """Test that params list passed is not modified"""
      params = ["x", "y"]
      flatten_params(space, params)
      assert params == ["x", "y"]
  
imports: import numpy
  import pandas
  import pytest
  from sklearn.ensemble import AdaBoostRegressor, BaggingRegressor, ExtraTreesRegressor, GradientBoostingRegressor, RandomForestRegressor
  from orion.analysis.base import average, flatten_numpy, flatten_params, ranking, to_numpy, train_regressor
  from orion.core.io.space_builder import SpaceBuilder
  from orion.core.worker.transformer import build_required_space
label_desc: Use image node_id 3 for calling the TestFlattenParams obj's underlying member method code with example usage: obj.test_params_unchanged(space) without return types