class_docstr: Test HSAF Reader.
class_docstr_tok: ["Test","HSAF","Reader","."]
docstr: Wrap pygrib to read fake data.
docstr_tok: ["Wrap","pygrib","to","read","fake","data","."]
code: def setUp(self):
      """Wrap pygrib to read fake data."""
      try:
          import pygrib
      except ImportError:
          pygrib = None
      self.orig_pygrib = pygrib
      sys.modules["pygrib"] = mock.MagicMock()
  
imports: import sys
  import unittest
  from datetime import datetime
  from unittest import mock
  import numpy
  from pytest import approx
  from satpy.tests.utils import make_dataid
label_desc: Use image node_id 1 for calling the TestHSAFFileHandler obj's underlying member method code with example usage: obj.setUp() without return types