code: def testGetFromEnvironment(self, findConfigFile, environ):
      findConfigFile.side_effect = self.files.get
      configuration.Configuration.clear()
  
      key = str(uuid.uuid4())
      environ.get.side_effect = {"NTA_CONF_PROP_" + key: "foo"}.get
      self.assertTrue(configuration.Configuration.get(key) == "foo")
  
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 28 for calling the ConfigurationCustomTest obj's underlying member method code with example usage: obj.testGetFromEnvironment(findConfigFile, environ) without return types