code: def test_multi_index_copy(self):
      arrays = [[1, 1, 2, 2], ["red", "blue", "red", "blue"]]
      idx = pd.MultiIndex.from_arrays(arrays, names=("number", "color"))
      pdf = pd.DataFrame(np.random.randn(4, 5), idx)
      psdf = ps.from_pandas(pdf)
  
      self.assert_eq(psdf.index.copy(), pdf.index.copy())
  
imports: import unittest
  from datetime import datetime
  import numpy
  import pandas
  import pyspark.pandas
  from pyspark.pandas.exceptions import PandasNotImplementedError
  from pyspark.testing.pandasutils import PandasOnSparkTestCase, TestUtils, SPARK_CONF_ARROW_ENABLED
label_desc: Use image node_id 4 for calling the IndexBasicMixin obj's underlying member method code with example usage: obj.test_multi_index_copy() without return types