What is screenshot testing - devrath/ComposeAlchemy GitHub Wiki

• Screenshot Testing is a new compose tool that allows us to test the composable UI automatically, without writing the test cases.
• This tool is released by Google.

How the UI tests are traditionally written

• We launch a screen.
• We make some actions on the views on the screen.
• We then do some assertions to check if the expectation matches the outcome.

How is this done

• We need to write a test case that sets up the UI first
• It will take a screen-shot of the screen first.
• We perform some action and take a new screen-shot.
• Now we compare the two screenshots. The framework is able to tell the differences between 2 screen-shots.
• When there is a difference, we know there is some issue.