The line alias PentoWeb.SurveyResultsLive on page 267 should be alias PentoWeb.Admin.SurveyResultsLive.
When it comes to running the test at the bottom of page 272 the test was failing with:
** (UndefinedFunctionError) function PentoWeb.SurveyResultsLive.assign_age_group_filter/1 is undefined (module PentoWeb.SurveyResultsLive is not available)
Thanks,
Carl