code: def test_interp_time_inplace_axis(self):
      # GH 9687
      periods = 5
      idx = date_range(start="2014-01-01", periods=periods)
      data = np.random.default_rng(2).random((periods, periods))
      data[data < 0.5] = np.nan
      expected = DataFrame(index=idx, columns=idx, data=data)
  
      result = expected.interpolate(axis=0, method="time")
      return_value = expected.interpolate(
          axis=0, method="time", 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 22 for calling the TestDataFrameInterpolate obj's underlying member method code with example usage: obj.test_interp_time_inplace_axis() without return types