code: def test_masked_unary_operations(self):
      # Tests masked_unary_operation
      (m, wm) = self.data
      with np.errstate(divide="ignore"):
          assert_(isinstance(np.log(wm), WrappedArray))
  
imports: import numpy
  from numpy.lib.mixins import NDArrayOperatorsMixin
  from numpy.testing import assert_, assert_raises
  from numpy.ma.testutils import assert_equal
  from numpy.ma.core import array, arange, masked, MaskedArray, masked_array, log, add, hypot, divide, asarray, asanyarray, nomask
label_desc: Use image node_id 2 for calling the TestClassWrapping obj's underlying member method code with example usage: obj.test_masked_unary_operations() without return types