code: def test_interp_inplace_row(self):
      # GH 10395
      result = DataFrame(
          {
              "a": [1.0, 2.0, 3.0, 4.0],
              "b": [np.nan, 2.0, 3.0, 4.0],
              "c": [3, 2, 2, 2],
          }
      )
      expected = result.interpolate(
          method="linear", axis=1, inplace=False
      )
      return_value = result.interpolate(
          method="linear", axis=1, inplace=True
      )
      assert return_value is None
      tm.assert_frame_equal(result, expected)
  
imports: import numpy
  import pytest
  from pandas._config import using_pyarrow_string_dtype
  from pandas.errors import ChainedAssignmentError
  import pandas.util._test_decorators
  from pandas import DataFrame, NaT, Series, date_range
  import pandas._testing
label_desc: Use image node_id 20 for calling the TestDataFrameInterpolate obj's underlying member method code with example usage: obj.test_interp_inplace_row() without return types