class_docstr: Unit test multi decorator Class
  TODO: Docstring
docstr: Unit test compute masked contributions
docstr_tok: ["Unit","test","compute","masked","contributions"]
code: def test_compute_masked_contributions(self):
      """
      Unit test compute masked contributions
      """
      backend = Mock()
      state = MultiDecorator(backend)
      state.compute_masked_contributions([1, 2, 3], [1, 2, 3])
      assert backend.compute_masked_contributions.call_count == 3
  
imports: import unittest
  from unittest.mock import patch, Mock
  import numpy
  import pandas
  from shapash.explainer.multi_decorator import MultiDecorator
label_desc: Use image node_id 10 for calling the TestMultiDecorator obj's underlying member method code with example usage: obj.test_compute_masked_contributions() without return types