code: def testDictReplacesKeysFromEnvironment(
      self, findConfigFile, environ
  ):
      environ.get.return_value = None
      findConfigFile.side_effect = self.files.get
      configuration.Configuration.clear()
      key = str(uuid.uuid4())
      env = {"NTA_CONF_PROP_" + key: "foo"}
      environ.keys.side_effect = env.keys
      environ.__getitem__.side_effect = env.__getitem__
      result = configuration.Configuration.dict()
      self.assertTrue(key in result)
      self.assertTrue(result[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 26 for calling the ConfigurationCustomTest obj's underlying member method code with example usage: obj.testDictReplacesKeysFromEnvironment(findConfigFile, environ) without return types