Ask HN: Best Automated Testing Approach for Canvas-Based Apps?

Canvas-based Apps:

Basically any app where most of the features involve user interaction on a graphical canvas (eg. checking if a map is drawn correctly on Google Maps, testing Paint or Figma-like sketching apps etc)

These types of apps are traditionally more difficult to test than GUI apps with predominantly form-like features.

I was wondering what the latest state-of-art was in regards to testing such apps, with respect to maintainability, low false positives/negatives etc.