code: def testGetIntMissingRaisesKeyError(
      self, findConfigFileMock, environMock
  ):
      findConfigFileMock.side_effect = self.files.get
      environMock.get.return_value = None
      configuration.Configuration.clear()
      with self.assertRaises(KeyError):
          configuration.Configuration.getInt(uuid.uuid1().hex)
  
imports: from copy import copy
  import os
  import shutil
  from StringIO import StringIO
  import sys
  import tempfile
  import unittest2
  import uuid
  from pkg_resources import resource_filename
  from mock import Mock, patch
  from pkg_resources import resource_filename
  from xml.parsers.expat import ExpatError
  import nupic
  import nupic.support.configuration_custom
  import configuration_test
label_desc: Use image node_id 18 for calling the ConfigurationCustomTest obj's underlying member method code with example usage: obj.testGetIntMissingRaisesKeyError(findConfigFileMock, environMock) without return types