Project testing v0

Break out into individual issues once work starts on a test suite.

• Codeception seems to be the front runner
• Mutant testing create function replicas, changing a single thing in each, then run them against original test suite to ensure they fail.
  • PHP Infection
  • JS Stryker
• Visual tests
• PRINCIPLES OF CHAOS ENGINEERING
• Accessibility / Screen reader testing

Ref For frontend https://media-codings.com/articles/automatically-detect-memory-leaks-with-puppeteer

"a module should have at least as many tests as its cyclomatic complexity"