code: def test_2d(self):
      x = np.tile(np.arange(6), (2, 1)).T
      trend = seasonal_decompose(x, period=2).trend
      expected = np.tile(np.arange(6, dtype=float), (2, 1)).T
      expected[0] = expected[-1] = np.nan
      assert_equal(trend, expected)
  
imports: from statsmodels.compat.pandas import MONTH_END, QUARTER_END, YEAR_END
  import numpy
  from numpy.testing import assert_allclose, assert_almost_equal, assert_equal, assert_raises
  import pandas
  import pytest
  from statsmodels.tsa.seasonal import seasonal_decompose
label_desc: Use image node_id 7 for calling the TestDecompose obj's underlying member method code with example usage: obj.test_2d() without return types