code: def test_repr(self, print_changed_only, expected, teardown):
      set_config(print_changed_only=print_changed_only)
      step = DummyEstimator(x=456, name="DE")
      assert repr(step) == expected
  
imports: from contextlib import contextmanager
  from functools import partial
  import pytest
  from sklearn.base import TransformerMixin, BaseEstimator
  from baikal import Input, Step, set_config
  from baikal._core.data_placeholder import DataPlaceholder
  from baikal._core.step import InputStep
  from tests.helpers.fixtures import teardown
  from tests.helpers.dummy_steps import DummyMIMO, DummySISO, DummyEstimator
  from tests.helpers.sklearn_steps import LogisticRegression, PCA
label_desc: Use image node_id 12 for calling the TestStep obj's underlying member method code with example usage: obj.test_repr(print_changed_only, expected, teardown) without return types