refactor load-path-test: removed unused require, lint-allow 100chars/line, no .bind(this)
refactor iife-processor-test: unify formatting
refactor resource-set-cache-test: no more .bind(this)
refactor resource-set-cache-test: reformat `.then(..)`s, as a preparation to fill in guards for unexpected code paths
improve tests: add guards for unexpected code paths re promises