code: def test_log1p_real(self):
      log1p = cupyx.scipy.special.log1p
      inf = cupy.inf
      nan = cupy.nan
      assert_array_equal(log1p(0), 0.0)
      assert_array_equal(log1p(-1), -inf)
      assert_array_equal(log1p(-2), nan)
      assert_array_equal(log1p(inf), inf)
  
imports: import math
  import cupy
  import numpy
  import pytest
  import cupyx.scipy.special
  from cupy import testing
  from cupy.testing import assert_array_equal, assert_array_almost_equal
  from cupy.testing import numpy_cupy_allclose
label_desc: Use image node_id 5 for calling the TestBasic obj's underlying member method code with example usage: obj.test_log1p_real() without return types