code: def test_to_coo(self, colnames):
      sp_sparse = pytest.importorskip("scipy.sparse")
  
      df = pd.DataFrame(
          {colnames[0]: [0, 1, 0], colnames[1]: [1, 0, 0]},
          dtype="Sparse[int64, 0]",
      )
      result = df.sparse.to_coo()
      expected = sp_sparse.coo_matrix(np.asarray(df))
      assert (result != expected).nnz == 0
  
imports: import string
  import numpy
  import pytest
  import pandas
  from pandas import SparseDtype
  import pandas._testing
  from pandas.core.arrays.sparse import SparseArray
label_desc: Use image node_id 5 for calling the TestFrameAccessor obj's underlying member method code with example usage: obj.test_to_coo(colnames) without return types