class_docstr: Fake message returned by pygrib.open().message(x).
class_docstr_tok: ["Fake","message","returned","by","pygrib.open","(",")",".message","(","x",")","."]
docstr: Validate key.
docstr_tok: ["Validate","key","."]
code: def valid_key(self, key):
      """Validate key."""
      return True
  
imports: import os
  import sys
  from unittest import mock
  import numpy
  import pytest
  import xarray
  from satpy.dataset import DataQuery
label_desc: Use image node_id 5 for calling the FakeMessage obj's underlying member method code with example usage: obj.valid_key(key) and returns: True