code: def setup_method(self):
      self._ctx = nn.get_current_context()
  
imports: import numpy
  import nnabla
  import pytest
  from nnabla.ext_utils import get_extension_context
  import nnabla.functions
label_desc: Use image node_id 1 for calling the TestNdArrayNarrow obj's underlying member method code with example usage: obj.setup_method() without return types