There are a few visual regression tools for the web, but most either cannot be run headless or use phantomjs which is deprecated and a browser nobody is actually using. They usually also require you to maintain fixtures. With react-native it's now possible to target multiple platforms with a single code base, but there's no single tool to test all to my knowledge.
Loki aims to have easy setup, no to low maintenance cost, reproducible tests independent of which OS they are run on, runnable on CI and support all platforms storybook does.
brew install graphicsmagick
brew cask install google-chrome-canary.
yarn add loki --dev yarn loki init
Loki will not start any servers for you, so ensure storybook and any simulator/emulator is up and running before running tests.
yarn loki update
yarn loki test
yarn loki approve
MIT License. © Joel Arvidsson 2017