LayoutTest http/tests/cache/cancel-during-revalidation-succeeded.html is a flaky failure (reporting FailureNotTested) https://build.webkit.org/results/Apple%20iOS%2010%20Simulator%20Release%20WK2%20(Tests)/r217555%20(1835)/results.html https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#tests=http%2Ftests%2Fcache%2Fcancel-during-revalidation-succeeded.html
Skipped test on ios-wk2 release in https://trac.webkit.org/changeset/217628/webkit