class RSpec::Mocks::ConstantMutator::DefinedConstantReplacer

def mutate
  @context = recursive_const_get(@context_parts.join('::'))
  @original_value = get_const_defined_on(@context, @const_name)
  constants_to_transfer = verify_constants_to_transfer!
  @context.__send__(:remove_const, @const_name)
  @context.const_set(@const_name, @mutated_value)
  transfer_nested_constants(constants_to_transfer)
end