code: def test_roc(self):
      with self.assertRaisesRegex(ValueError, "needed to plot"):
          plot.roc([1, 0], None)
  
file_path: sklearn-evaluation/tests/test_plot_input.py
imports: from unittest import TestCase
  from sklearn_evaluation import plot
label_desc: Use image node_id 2 for calling the TestMissingInput obj's underlying member method code with example usage: obj.test_roc() without return types