code: def test_to_dense(self):
      df = pd.DataFrame(
          {
              "A": SparseArray([1, 0], dtype=SparseDtype("int64", 0)),
              "B": SparseArray([1, 0], dtype=SparseDtype("int64", 1)),
              "C": SparseArray(
                  [1.0, 0.0], dtype=SparseDtype("float64", 0.0)
              ),
          },
          index=["b", "a"],
      )
      result = df.sparse.to_dense()
      expected = pd.DataFrame(
          {"A": [1, 0], "B": [1, 0], "C": [1.0, 0.0]}, index=["b", "a"]
      )
      tm.assert_frame_equal(result, expected)
  
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 8 for calling the TestFrameAccessor obj's underlying member method code with example usage: obj.test_to_dense() without return types