code: def test_only_X(self):
      # Regression test for Issue #898
      X = pd.DataFrame.from_dict(
          {"alpha": ["a", "a", "b"], "beta": [1, 2, 1]}
      )
  
      X_update, _, _, _ = iv._validate_and_reformat_input(
          X=X, expect_y=False, expect_sensitive_features=False
      )
      assert isinstance(X_update, pd.DataFrame)
  
imports: import numpy
  import pandas
  import fairlearn.utils._input_validation
label_desc: Use image node_id 2 for calling the TestValidateAndReformatInput obj's underlying member method code with example usage: obj.test_only_X() without return types