What is the goal of screenshot testing?

The goal of screenshot (visual) testing is to detect unintended visual changes in the interface and guarantee that the UI continues to look the way it should after updates to the code, libraries, browsers or styles.

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The main task: protect the appearance of the interface. The test answers the question: "Does the interface look just as correct as before?"

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Screenshot testing helps:

• detect visual bugs (shifted layout, a disappeared element, broken spacing)
• capture the UI state and track any changes
• avoid design regressions during refactoring, CSS changes or component updates
• reduce the amount of manual visual checking

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The essence: there is a reference screenshot, and every new result is compared with it. If the image has changed, the test reports this, showing exactly what changed.