Screenshot tests on hash: accelerating screenshot comparison

Automated UI screenshot tests are an extremely useful type of testing, but the speed of running them, for various reasons, often leaves much to be desired. Comparing actual and expected screenshots pixel-by-pixel may not be the fastest way, turning visual verification into a pipeline bottleneck.

In my talk, I will demonstrate how to use hash functions to simplify and speed up these checks while still maintaining the reliability of detecting real changes. Thanks to this approach, screenshot tests will not slow down your releases, but on the contrary — they will become an effective tool for fast UI validation.